OPTC2/C8 VACON NXP Air Cooled

Product Information: Vacon NX AC Drives – Modbus/N2 Option

Board

Specifications

• Model: Vacon NX
• Product Type: AC Drives
• Option Board: OPTC2/C8 Modbus/N2
• Document Code: DPD00899A
• Date: 19.01.2012

General

The Vacon NX frequency converters can be connected to the RS-485
bus using the Modbus/N2 Option Board. This allows the frequency
converter to be controlled, monitored, and programmed from a host
system. Instead of using I/O, information can be sent and received
through the fieldbus connection.

If you have purchased the RS-485 Option Board separately, please
ensure it is installed in slot E on the control board of the
frequency converter.

WARNING! When the frequency converter is
connected to the power source, internal components and circuit
boards are at high potential. This voltage is extremely dangerous
and may cause death or severe injury if contact is made.

RS-485 Option Board Technical Data

The RS-485 Option Board provides the following technical
data:

Connections| Communications Interface| Data Transfer Method| Transfer Cable| Electrical Isolation
---|---|---|---|---
OPTC2: Pluggable connector (5.08mm)
OPTC8: 9-pin DSUB connector (female)| RS-485, half-duplex| Modbus RTU
Metasys N2| Twisted pair (1 pair and shield)| 500 VDC

Installation of Vacon NX RS-485 Board

Refer to the user manual for detailed instructions on how to
install the RS-485 Option Board on the Vacon NX frequency
converter. Ensure the board is installed in slot E on the control
board.

Commissioning

During commissioning, you need to configure the fieldbus board
parameters. Refer to Chapter 5.1 of the user manual for detailed
instructions on how to set up the fieldbus parameters.

Fault Tracking

If a fault occurs with the frequency converter, refer to
Appendix 1 of the user manual for fault tracking information.

Modbus

Start-up Test

To perform a start-up test using Modbus:

1. Choose Fieldbus (Bus/Comm) as the active control place (see
   Vacon NX User’s Manual, Chapter 7.3.3).

2. Set FB Control Word (MBaddr 42001) value to 1hex.

3. Ensure the frequency converter status is RUN.

4. Set FB Speed Reference (MBaddr 42003) value to 5000
   (=50.00%).

5. The actual value should be 5000 and the frequency converter
   output frequency should be 25.00 Hz.

6. Set FB Control Word (MBaddr 42001) value to 0hex.

7. Ensure the frequency converter status is STOP.

8. If FB Status Word (Addr 42101) bit 3 = 1, the status of the
   frequency converter is FAULT.

FAQ

Q: Where should I install the RS-485 Option Board?

A: The RS-485 Option Board should be installed in slot E on the
control board of the Vacon NX frequency converter.

Q: How can I configure the fieldbus board parameters?

A: Refer to Chapter 5.1 of the user manual for detailed
instructions on how to set up the fieldbus parameters during
commissioning.

Q: What should I do if a fault occurs with the frequency

converter?

A: Refer to Appendix 1 of the user manual for fault tracking
information.

vacon nx
ac drives
optc2/c8
modbus/n2 option board
user manual

INDEX

Document code: DPD00899A Date 19.01.2012

1. GENERAL …………………………………………………………………………………………………………… 3

2. RS-485 OPTION BOARD TECHNICAL DATA ……………………………………………………………… 4 2.1 General ……………………………………………………………………………………………………………………….. 4

3. RS-485 FIELDBUS BOARD LAYOUT AND CONNECTIONS …………………………………………… 5 3.1 RS-485 OPTC2 option board …………………………………………………………………………………………… 5 3.2 RS-485 OPTC8 option board …………………………………………………………………………………………… 6 3.3 Grounding ……………………………………………………………………………………………………………………. 7 3.3.1 Grounding by clamping the cable to the converter frame………………………………………….7 3.3.2 Grounding only one point on the net……………………………………………………………………….9 3.3.3 Grounding jumper X1 ………………………………………………………………………………………….10 3.4 Bus terminal resistors…………………………………………………………………………………………………. 11 3.5 Bus Biasing ………………………………………………………………………………………………………………… 12 3.6 LED indications …………………………………………………………………………………………………………… 13

4. INSTALLATION OF VACON NX RS-485 BOARD ……………………………………………………….. 14

5. COMMISSIONING……………………………………………………………………………………………….. 16 5.1 Fieldbus board parameters ………………………………………………………………………………………….. 16

6. MODBUS…………………………………………………………………………………………………………… 19 6.1 Modbus RTU protocol, introduction……………………………………………………………………………….. 19 6.1.1 Supported functions……………………………………………………………………………………………21 6.1.2 Exception responses…………………………………………………………………………………………..23 6.2 Modbus interface ………………………………………………………………………………………………………… 25 6.2.1 Modbus registers……………………………………………………………………………………………….25 6.2.2 Process data ……………………………………………………………………………………………………..25 6.2.3 Process data in ………………………………………………………………………………………………….26 6.2.4 Process data out ………………………………………………………………………………………………..27 6.2.5 Parameters ……………………………………………………………………………………………………….30 6.2.6 Actual values……………………………………………………………………………………………………..30 6.2.7 Example messages…………………………………………………………………………………………….31 6.3 Start-up test ………………………………………………………………………………………………………………. 33

7. METASYS N2……………………………………………………………………………………………………… 34 7.1 Metasys N2 Protocol Introduction …………………………………………………………………………………. 34 7.2 Metasys N2 interface …………………………………………………………………………………………………… 34 7.2.1 Analogue Input (AI) …………………………………………………………………………………………….34 7.2.2 Binary Input (BI) …………………………………………………………………………………………………34 7.2.3 Analogue Output (AO)………………………………………………………………………………………….35 7.2.4 Binary Output (BO) ……………………………………………………………………………………………..35 7.2.5 Internal Integer (ADI) ………………………………………………………………………………………….35 7.3 N2 POINT MAP……………………………………………………………………………………………………………. 36 7.3.1 Analogue Inputs (AI)……………………………………………………………………………………………36 7.3.2 Binary Inputs (BI) ……………………………………………………………………………………………….37 7.3.3 Analogue Outputs (AO)………………………………………………………………………………………..37 7.3.4 Binary Outputs (BO) ……………………………………………………………………………………………38 7.3.5 Internal Integers (ADI) ………………………………………………………………………………………..38

8. FAULT TRACKING………………………………………………………………………………………………. 39 APPENDIX 1 ………………………………………………………………………………………………………………………….. 40

general

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1. GENERAL Instead of sending and receiving information to and from frequency converters through I/O, you can connect them to a fieldbus.
Vacon NX frequency converters can be connected to the RS-485 bus using a fieldbus board. The converter can then be controlled, monitored and programmed from the host system.
If you purchase your RS-485 Option Board separately, please note that it shall be installed in slot E on the control board of the frequency converter.

WARNING!

Internal components and circuit boards are at high potential when the frequency converter is connected to the power source. This voltage is extremely dangerous and may cause death or severe injury if you come into contact with it.

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technical data

2. RS-485 OPTION BOARD TECHNICAL DATA

2.1 General

Connections Communications

Interface
Data transfer method Transfer cable Electrical isolation Modbus RTU Metasys N2

Environment Safety

Baud rate Addresses Ambient operating temperature Storing temperature Humidity Altitude Vibration

Table 1. RS-485 technical data

OPTC2: Pluggable connector (5.08mm) OPTC8: 9-pin DSUB connector (female) RS-485, half-duplex
Twisted pair (1 pair and shield) 500 VDC As described in document “Modicon Modbus Protocol Reference Guide”
Find it for example at: http://public.modicon.com/
As described in Metasys N2 System Protocol Specification 300, 600, 1200, 2400, 4800, 9600, 19200 and 38400 kbaud 1 to 247 ­10°C…55°C
­40°C…60°C
<95%, no condensation allowed Max. 1000 m 0.5 G at 9…200 Hz Fulfils EN50178 standard

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layout and connections

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3. RS-485 FIELDBUS BOARD LAYOUT AND CONNECTIONS
Vacon RS-485 Fieldbus Board is connected to the fieldbus through either a 5-pin pluggable bus connector (board OPTC2) or a 9-pin female sub-D-connector (board OPTC8). The communication with the control board of the frequency converter takes place through the standard Vacon Interface Board Connector.
3.1 RS-485 OPTC2 option board

1

2

3 4

X4

5

X1

Bus connector

Jumpers

Grounding plate

Interface board connector

Figure 1. Vacon RS-485 option board OPTC2

Signal

Connector

Description

NC*

1*

No connection

VP

2

Supply voltage ­ plus (5V)

RxD/TxD ­N

3

Receive/Transmit data ­ A

RxD/TxD ­P

4

Receive/Transmit data ­ B

DGND

5

Data ground (reference potential for VP)

*You can use this pin (1) to bypass the cable shield to the next slave

Table 2. OPTC2 bus connector signals

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3.2 RS-485 OPTC8 option board

5

4

3

2

1

9

8

7

6

layout and connections

X4

X1

Bus connector

Jumpers

Grounding plate

Figure 2. Vacon RS-485 option board OPTC8

Interface board connector

Signal

Connector Description

Shield

1

Cable shield

RxD/TxD-N

3

Receive/ A

DGND

5

Data ground (reference potential for VP)

VP

6

Supply voltage ­ plus (5V)

RxD/TxD-P

8

Receive/ Transmit data/ B

Table 3. OPTC8 bus connector signals

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3.3 Grounding
3.3.1 Grounding by clamping the cable to the converter frame This manner of grounding is the most effective and especially recommended when the distances between the devices are relatively short or if the device is the last device on the net.
Note: Normally, the option board has already been installed in slot D or slot E of the control board. It is not necessary to detach the whole board for the grounding of the bus cable shield. Just detach the terminal block.
1 Strip about 5 cm of the cable and cut off the grey cable shield. Remember to do this for both bus cables (except for the last device). See pictures below.
2 Leave no more than 1 cm of the cable outside the terminal block and strip the data cables at about 0.5 cm to fit in the terminals. See pictures below. Note: Do this for both bus cables.

Strip this part Cut here

Figure 3.

1 2 3 4 5

A

B

Figure 4.
3 Insert the data cables of both cables into terminals #3 (Line B) and #4 (Line A).

4 Strip the cable at such a distance from the terminal that you can fix it to the frame with the grounding clamp. See

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layout and connections

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layout and connections

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3.3.2 Grounding only one point on the net
In this manner of grounding, the shield is connected to ground only at the last device on the net in the same way as described in chapter 3.3.1. Other devices of the net just pass the shield. We recommend you to use an Abico connector to fit the shields into the terminal.
1 Strip about 5 cm of the cable and cut off the grey cable shield. Remember to do this for both bus cables (except for the last device).
2 Leave no more than 1 cm of the cable outside the terminal block and strip the data cables at about 0.5 cm to fit in the terminals. See Figure 6. Note: Do this for both bus cables.

1 2 3 4 5

Shield

A

B

Figure 6. 3 Fix both the cables on the frame with the clamp. See Figure 7.

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layout and connections

3.3.3 Grounding jumper X1
The Grounding jumper X1 on the OPTC8 is used for grounding selection. If position ON is selected it means that the D-sub connector PIN1 is connected directly to ground. Selection of position OFF means that PIN1 is connected to ground via an RC-filter. Jumper X1 has no effect on OPTC2.

5

432

1

9

876

ON

OFF

X4

X1 Figure 8. Grounding jumper X1

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layout and connections

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3.4 Bus terminal resistors
If Vacon is the last device of the fieldbus line the bus termination must be set. Use jumper X4 (ON position) or external termination resistors (e.g. in DSUB-9 connector). See Figure 9.

5

432

1

9

876

ON

OFF

X4

X1 Figure 9. Using jumper X4 to set the bus termination.

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layout and connections

3.5 Bus Biasing
Bus biasing is required to ensure faultless communication between devices at RS-485 bus. Bus biasing makes sure that the bus state is at proper potential when no device is transmitting. Without biasing, faulty messages can be detected when the bus is in idle state. RS-485 bus state should be neather +0,200..+7V or ­0,200..-7V. Illegal bus state is <200mV..-200mV.

Number of nodes Bias resistance

2-5

1.8 kohm

5-10

2.7 kohm

11-20

12 kohm

21-30

18 kohm

31-40

27 kohm

Table 4. Bias resistor size vs number of node

Fail safe biasing in OPTC2 option board
Connect resistor biasing resistors between pins #2 and #4 as well as pins #3 and #5 as shown in picture.

1

2

A DATA-

3

B DATA+

4

5

5

Matters related to this are discussed in the application note Failsafe Biasing of Differential Buses (an847.pdf) published by National Semiconductor (www.national.com).

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3.6 LED indications
The two LED indications next to the connector show the present statuses of the RS-485 board (yellow) and the Fieldbus Module (green).

Yellow Green

1

2

3 4

X4

5

X1

Figure 10. LED indications on the RS-485 board

RS-485 board status LED (BS) YELLOW

LED is: OFF

Meaning: Option board not activated

ON
Blinking fast (once/sec) Blinking slow (once/5 secs)

Option board in initialisation state waiting for activation command from the frequency converter Option board is activated and in RUN state · Option board is ready for external communication Option board is activated and in FAULT state · Internal fault of option board

Fieldbus status LED (FS)

GREEN

LED is: OFF
ON
Blinking fast (once/sec) Blinking slow (once/5 secs)

Meaning: Fieldbus module is waiting for parameters from the frequency converter · No external communication Fieldbus module is activated · Parameters received and module activated · Module is waiting for messages from the bus Module is activated and receiving messages from the bus
Module is in FAULT state · No messages from Master within the watchdog time · Bus broken, cable loose or Master off line

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4. INSTALLATION OF VACON NX RS-485 BOARD
A Vacon NX frequency converter

installation

B Remove the cable cover.

C Open the cover of the control unit.

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installation

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D Install RS-485 option board in slot E on the control board of the frequency con-
verter. Make sure that the grounding plate (see below) fits tightly in the clamp.

1

2

3 4

X4

5

X1

E Make a sufficiently wide opening for
your cable by cutting the grid as wide as necessary.

F Close the cover of the control unit and
the cable cover.

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modbus

5. COMMISSIONING
READ FIRST CHAPTER 8 ‘COMMISSIONING’ IN VACON NX USER’S MANUAL (Document nr. ud00701, please visit http://www.vacon.com/925.html).
Note! You must select Fieldbus as the active control place, if you wish to control the frequency converter through fieldbus. See Vacon NX User’s Manual, Chapter 7.3.3.1.
5.1 Fieldbus board parameters
The Vacon RS-485 board is commissioned with the control keypad by giving values to appropriate parameters in menu M7 (for locating the expander board menu see Vacon NX User’s Manual, Chapter 7).
Expander board menu (M7) The Expander board menu makes it possible for the user 1) to see what expander boards are connected to the control board and 2) to reach and edit the parameters associated with the expander board.
Enter the following menu level (G#) with the Menu button right. At this level, you can browse through slots A to E with the Browser buttons to see what expander boards are connected. On the lowermost line of the display you also see the number of parameter groups associated with the board.
If you still press the Menu button right once you will reach the parameter group level where there are two groups: Editable parameters and Monitored values. A further press on the Menu button right takes you to either of these groups.
RS-485 parameters
To commission the RS-485 board, enter the level P7.5.1.# from the Parameters group (G7.5.1). Give desired values to all RS-485 parameters (see Figure 11 and Table 5).

I/Oter m

RE ADY

Expander Board
G1G5

I/Oter m

RE ADY

Slave address
126

I/Oter m

RE ADY

NXOPTC5
G1G2

I/Oter m

RE ADY

Slave address
126

I/Oter m

RE ADY

Parameters
P1P4

CHANGE VALUE enter CONFIRM CHANGE

Figure 11. Changing the RS-485 board commissioning parameter values

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commissioning

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Name 1 COMMUNICATION

PROTOCOL 2 SLAVE ADDRESS 3 BAUD RATE

Default 1 1

6

4 PARITY TYPE 0

5 COMMUNICATION TIMEOUT

20

6 OPERATE MODE

1

Table 5. RS-485 parameters

Range 1 ­ Modbus RTU 2 ­ N2 1…247 1 ­ 300 baud 2 ­ 600 baud 3 ­ 1200 baud 4 ­ 2400 baud 5 ­ 4800 baud 6 ­ 9600 baud 7 ­ 19200 baud 8 ­ 38400 baud 0 ­ None 1 ­ Even 2 ­ Odd 0–OFF 1–300 s 1 ­ Normal

Description Protocol
Communication speed When N2 protocol is used Baudrate must be set to 9600.
Describes what kind of parity checking is used. When N2-protocol is used Parity type must be set to 0 = None See chapter Communication timeout below Reserved for later use

The parameters of every device must be set before connecting to the bus. Especially the parameters Communication Protocol, Slave Address and Baud Rate must be the same as in the master configuration.

Communication timeout
The RS-485 board initiates a communication error if communication is broken for as long as defined by the Communication Timeout. Communication Timeout is disabled when given the value 0.

Communication status
To see the present status of the RS-485 fieldbus, enter the Comm.Status page from Monitor menu (G7.5.2). See Figure 12 and Table 6 below.

I/Oter m

RE ADY

Monitor
V1V1

I/Oter m

RE ADY

Comm. status

0.841

Figure 12. Communication status

Good messages Error messages

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Good messages 0…999 Number of messages received without
communication errors Error messages
0…64 Number of messages received with CRC or parity errors
Table 6. RS-485 message indications

modbus

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modbus

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6. MODBUS
6.1 Modbus RTU protocol, introduction
The MODBUS protocol is an industrial communications and distributed control system to integrate PLCs, computers, terminals, and other monitoring, sensing, and control devices. MODBUS is a Master-Slave communications protocol. The Master controls all serial activity by selectively polling one or more slave devices. The protocol provides for one master device and up to 247 slave devices on a common line. Each device is assigned an address to distinguish it from all other connected devices.
The MODBUS protocol uses the master-slave technique, in which only one device (the master) can initiate a transaction. The other devices (the slaves) respond by supplying the request data to the master, or by taking the action requested in the query. The master can address individual slaves or initiate a broadcast message to all slaves. Slaves return a message (`response’) to queries that are addressed to them individually. Responses are not returned to broadcast queries from the master.
A transaction comprises a single query and single response frame or a single broadcast frame. The transaction frames are defined below.

Master’s message
START ADDRESS FUNCTION
DATA
CRC END

Slave response
START ADDRESS FUNCTION
DATA
CRC END

Figure 13. The basic structure of a Modbus frame
Valid slave device addresses are in the range of 0 … 247 decimal. The individual slave devices are assigned addresses in the range of 1 … 247. A master addresses a slave by placing the slave address in the address field of the message. When the slave sends its response, it places its own address in this address field of the response to let the master know which slave is responding.
The function code field of a message frame contains two characters (ASCII) or eight bits (RTU). Valid codes are in the range of 1 … 255 decimal. When a message is sent from a master to a slave device the function code field tells the slave what kind of action to perform. Examples are to read the ON / OFF states of a group of discrete coils or inputs; to read the data contents of a group of registers; to
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modbus

read the diagnostic status of the slave; to write to designated coils or registers; or to allow loading, recording, or verifying the program within the slave.
When the slave responds to the master, it uses the function code field to indicate either a normal (error-free) response or that some kind of error occurred (called an exception response). For a normal response, the slave simply echoes the original function code. For an exception response, the slave returns a code that is equivalent to the original function code with its most significant bit set to a logic 1.
The data field is constructed using sets of two hexadecimal digits, in the range of 00 to FF hexadecimal. These can be made from a pair of ASCII characters, or from one RTU character, according to the network’s serial transmission mode.
The data field of messages sent from a master to slave devices contains additional information which the slave must use to take the action defined by the function code. This can include items like discrete and register addresses, the quantity of items to be handled, and the count of actual data bytes in the field. If no error occurs, the data field of a response from a slave to a master contains the data requested. If an error occurs, the field contains an exception code that the master application can use to determine the next action to be taken.
Two kinds of checksum are used for standard Modbus networks. The error checking field contents depend upon the transmission method that is being used.

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modbus

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6.1.1 Supported functions

Function Code Description

Address range

03

Read Holding Registers Applies to all addresses

04

Read Input Registers Applies to all addresses

06

Write Single Register Applies to all addresses

16

Write Multiple Regis- Applies to all addresses

ters

Note: Broadcasting can be used with codes 06 and 16

Table 7. Supported messages

6.1.1.1 Read Holding Registers
The query message specifies the starting register and the quantity of registers to be read. Registers are addressed starting with zero, i.e. registers 1 to 16 are addressed as 0 to 15.

Example of a request to read registers 42001-42003 from Slave device 1:

ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO No. of points HI No. of points LO ERROR CRC HI CHECK CRC LO

01 hex 03 hex 07 hex D0 hex 00 hex 03 hex 05 hex 46 hex

Slave address 1 hex (= 1) Function 03 hex (= 3) Starting address 07d0 hex (= 2000)
Number of registers 0003 hex (= 3)
CRC field 0546 hex (= 1350)

6.1.1.2 Read Input Registers
The query message specifies the starting register and the quantity of registers to be read. Registers are addressed starting with zero, i.e. registers 1 to 16 are addressed as 0 to 15.

Example of a request to read registers 32001 from Slave device 1:

ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO No. of points HI No. of points LO ERROR CRC HI CHECK CRC LO

01 hex 04 hex 07 hex D0 hex 00 hex 01 hex 31 hex 47 hex

Slave address 1 hex (= 1) Function 04 hex (= 4) Starting address 07d0 hex (= 2000)
Number of registers 0003 hex (= 3)
CRC field 3147 hex (= 12615)

6.1.1.3 Preset Single Register
The query message specifies the register reference to be preset. Registers are addressed starting with zero, i.e. register 1 is addressed as 0.

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modbus

Example of a request to preset register 42001 to 00001hex in Slave device 1:

ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO Data HI Data LO ERROR CRC HI CHECK CRC LO

01 hex 06 hex 07 hex D0 hex 00 hex 01 hex 48 hex 87 hex

Slave address 1 hex (= 1) Function 04 hex (= 4) Starting address 07d0 hex (= 2000)
Data = 0001 hex (= 1)
CRC field 4887 hex (= 18567)

6.1.1.4 Preset Multiple Registers
The query message specifies the register references to be preset. Registers are addressed starting with zero, i.e. register 1 is addressed as 0.

Example of a request to preset two registers starting at 42001 to 0001hex and 0010hex in Slave device 1:

ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO No. of registers HI No. of registers LO Byte count Data HI Data LO Data HI Data LO ERROR CRC HI CHECK CRC LO

01 hex 10 hex 07 hex D0 hex 00 hex 02 hex 04 hex 00 hex 01 hex 00 hex 10 hex 88 hex CF hex

Slave address 1 hex (= 1) Function 10 hex (= 16) Starting address 07d0 hex (= 2000)
Number of registers 0002 hex (= 2)
Byte count 04 hex (= 4) Data 1 = 0001 hex (= 1) Data 2 = 0010 hex (= 16)
CRC field 88CF hex (= 35023)

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modbus

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6.1.2 Exception responses
Error response is given when the Slave receives a message without communication errors, but cannot handle it. Examples of such messages are an incorrect register address, data value or unsupported message. No answer is given if a CRC or parity error occurs or the message is a broadcast message.

Code Function

01

ILLEGAL FUNCTION

02

ILLEGAL DATA AD-

DRESS

03

ILLEGAL DATA VALUE

06

SLAVE DEVICE BUSY

Table 8. Exception response codes

Description
The message function requested is not recognized by the slave.
The received data address is not an allowable address for the slave
The received data value is not an allowable value for the slave.
The message was received without error but the slave was engaged in processing a long duration program command.

Example of an exception response
In an exception response, the Slave sets the most-significant bit (MSB) of the function code to 1. The Slave returns an exception code in the data field.

Command Master ­ Slave:

ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO No. of registers HI No. of registers LO ERROR CRC HI CHECK CRC LO

01 hex 04 hex 17 hex 70 hex 00 hex 05 hex 34 hex 66 hex

Slave address 1 hex (= 1) Function 4 hex (= 4) Starting address 1770 hex (= 6000)
Invalid number of registers 0005 hex (= 5)
CRC field 3466 hex (= 13414)

Message frame: 01 04 17 70 00 05 34 66

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modbus

Exception response.
Answer Slave ­ Master:
ADDRESS FUNCTION ERROR CODE ERROR CRC HI CHECK CRC LO

01 hex 14 hex 02 hex AE hex
C1 hex

Slave address 1 hex (= 1) Most significant bit set to 1 Error code 02 => Illegal Data Address CRC field AEC1 hex (= 44737)

Reply frame: 01 14 02 AE C1

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modbus

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6.2 Modbus interface
Features of the Modbus-Vacon NX interface: · Direct control of Vacon NX ( e.g. Run, Stop, Direction, Speed reference, Fault reset) · Full access to all Vacon NX parameters · Monitor Vacon NX status (e.g. Output frequency, Output current, Fault code)

6.2.1 Modbus registers
The Vacon variables and fault codes as well as the parameters can be read and written from Modbus. The parameter addresses are determined in the application. Every parameter and actual value have been given an ID number in the application. The ID numbering of the parameter as well as the parameter ranges and steps can be found in the application manual in question. The parameter value shall be given without decimals. If several parameters/actual values are read with one message, the adresses of the parameters/actual values must be consecutive.
All values can be read with function codes 3 and 4 (all registers are 3X and 4X reference). Modbus registers are mapped to drive ID’s as follows:

ID

Modbus register

1 … 98

40001…40098 (30001…30098)

99

40099 (30099)

101… 1999

40101…41999 (30101…31999)

2001…2099

42001…42099 (32001…32099)

2101…2199

42101…42199 (32101…32199)

Table 9. Index table

Group Actual Values Fault Code Parameters Process Data In Process Data Out

R/W 30/1 30/1 30/1 20/20 20/20

6.2.2 Process data
The process data fields are used to control the drive (e.g. Run, Stop , Reference, Fault Reset) and to quickly read actual values (e.g. Output frequency, Output current, Fault code). The fields are structured as follows:

Process Data Slave -> Master(max 22 bytes)

ID 2101 2102 2103

Modbus register 32101, 42101 32102, 42102 32103, 42103

Name FB Status Word FB General Status Word FB Actual Speed

2104 2105 2106 2107 2108 2109

32104, 42104 32105, 42105 32106, 42106 32107, 42107 32108, 42108 32109, 42109

FB Process Data Out 1 FB Process Data Out 2 FB Process Data Out 3 FB Process Data Out 4 FB Process Data Out 5 FB Process Data Out 6

2110 32110, 42110 2111 32111, 42111

FB Process Data Out 7 FB Process Data Out 8

Table 10.

Range/Type Binary coded Binary coded 0…10000 % See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1

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Process Data Master -> Slave

(max 22 bytes)

ID

Modbus register Name

2001 2002 2003 2004 2005 2006

32001, 42001 32002, 42002 32003, 42003 32004, 42004 32005, 42005 32006, 42006

FB Control Word FB General Control Word FB Speed Reference FB Process Data In 1 FB Process Data In 2 FB Process Data In 3

2007 2008 2009 2010 2011

32007, 42007 32008, 42008 32009, 42009 32010, 42010 32011, 42011

FB Process Data In 4 FB Process Data In 5 FB Process Data In 6 FB Process Data In 7 FB Process Data In 8

Table 11.

Range/Type Binary coded Binary coded 0…10000 % Integer 16 Integer 16 Integer 16 Integer 16 Integer 16 Integer 16 Integer 16 Integer 16

The use of process data depends on the application. In a typical situation, the device is started and stopped with the ControlWord (CW) written by the Master and the Rotating speed is set with Reference (REF). With PD1…PD8 the device can be given other reference values (e.g. Torque reference). With the StatusWord (SW) read by the Master, the status of the device can be seen. Actual Value (ACT) and PD1…PD8 show the other actual values.

6.2.3 Process data in
This register range is reserved for the control of the frequency converter. Process data in is located in range ID 2001…2099. The registers are updated every 10 ms. See Table 12.

ID

Modbus register

Name

2001 32001, 42001

FB Control Word

2002 32002, 42002

FB General Control Word

2003 32003, 42003

FB Speed Reference

2004 32004, 42004

FB Process Data In 1

2005 32005, 42005

FB Process Data In 2

2006 32006, 42006

FB Process Data In 3

2007 32007, 42007

FB Process Data In 4

2008 32008, 42008

FB Process Data In 5

2009 32009, 42009

FB Process Data In 6

2010 32010, 42010

FB Process Data In 7

2011 32011, 42011

FB Process Data In 8

Table 12. Fieldbus basic input table

Range/Type Binary coded Binary coded 0…10000 % Integer 16 Integer 16 Integer 16 Integer 16 Integer 16 Integer 16 Integer 16 Integer 16

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6.2.3.1 Control word

15 14 13 12 11 10

9

8

7

6

5

4

3

2

1

0

–

–

–

–

–

–

–

–

–

–

–

–

– RST DIR RUN

In Vacon applications, the three first bits of the control word are used to control the frequency converter. However, you can customise the content of the control word for your own applications because the control word is sent to the frequency converter as such.

Bit

Description

Value = 0

Value = 1

0

Stop

Run

1

Clockwise

Counterclockwise

2

Rising edge of this bit will reset active fault

3….15

Not in use

Not in use

Table 13. Control word bit descriptions

6.2.3.2 Speed reference

15 14 13 12 11 10

9

8

7

6

5

4

3

2

1

0

MSB

LSB

This is the Reference 1 to the frequency converter. Used normally as Speed reference. The allowed scaling is ­10000…10000. In the application, the value is scaled in percentage of the frequency area between the set minimum and maximum frequencies.

6.2.3.3 Process data in 1 to 8
Process Data In values 1 to 8 can be used in applications for various purposes. Update rate is 10 ms for all values. See Vacon NX Application Manual for usage of these data values.

6.2.4 Process data out
This register range is normally used to fast monitoring of the frequency converter. Process data out is located in range ID 2101…2199. See Table 14.

ID 2101 2102

Modbus register 32101, 42101 32102, 42102

Name FB Status Word FB General Status Word

2103 2104 2105 2106 2107 2108 2109 2110 2111

32103, 42103 32104, 42104 32105, 42105 32106, 42106 32107, 42107 32108, 42108 32109, 42109 32110, 42110 32111, 42111

FB Actual Speed FB Process Data Out1 FB Process Data Out2 FB Process Data Out3 FB Process Data Out4 FB Process Data Out5 FB Process Data Out6 FB Process Data Out7 FB Process Data Out8

Table 14. Fieldbus basic output table

Range/Type Binary coded Binary coded
0…10000 % See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1 See appendix 1

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6.2.4.1 Status word

15

14

13

12

11 10

9

8

7

6

5

4

3

2

1

0

–

–

–

–

–

UVFS

DDI R

TCSPDL

FR

Z

ARE F

W FLT DIR RUN RDY

Information about the status of the device and messages is indicated in the Status word. The Status word is composed of 16 bits that have the following meanings:

Bit

Description

Value = 0

Value = 1

0

Not Ready

Ready

1

STOP

RUN

2

Clockwise

Counterclockwise

3

–

Faulted

4

–

Warning

5

Ref. frequency not reached

Ref. Frequency reached

6

–

Motor is running at zero speed

7

Flux Not Ready

Flux Ready

8

TC Speed Limit Active

TC Speed Limit Not Active

9

Detected Encoder Direction Clockwise Encoder Direction Counterclockwise

10

UV Fast Stop Active

UV Fast Stop Not Active

11…15 Not In use

Not In use

Table 15. Status word bit descriptions

6.2.4.2 General status word

15

14

13

12

11 10

9

8

7

6

5

4

3

2

1

0

I/O PANEL FB

–

–

–

–

–

–

–

–

–

–

–

–

Bit

Description

0…12

Not in use

13

Fieldbus control, (1 = FB control active)

14

Panel control, (1 = Panel control active)

15

I/O Control, (1 = I/O control active)

Table 16. General status word bit descriptions

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6.2.4.3 Actual speed

15 14 13 12 11 10

9

8

7

6

5

4

3

2

1

0

MSB

LSB

This is the reference 1 to the frequency converter. Used normally as Speed reference. The allowed scaling is ­10000…10000. In the application, the value is scaled in percentage of the frequency area between set minimum and maximum frequency.

6.2.4.4 Process data out 1 to 8
Process Data Out values 1 to 8 can be used in application for various purposes. Update rate is 10ms for all values. See APPENDIX 1 for usage of these values.

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modbus

6.2.5 Parameters
The parameter addresses are determined in the application. Every parameter has been given an ID number in the application. The ID numbering of the parameter as well as the parameter ranges and steps can be found in the application manual in question. The parameter value shall be given without decimals. The following functions can be activated with parameters:

Function code Function

03

Read Holding Registers

04

Read Input Registers

06

Preset Single Register

16

Preset Multiple

Registers

Table 17. Parameters

Modbus Address 30101…31999 40101…41999 40101…41999 40101…41999

Parameter ID’s 101-1999 101-1999 101-1999 101-1999

6.2.6 Actual values
The actual values as well as parameter addresses are determined in the application. Every actual value has been given an ID number in the application. The ID numbering of the actual values as well as the value ranges and steps can be found in the application manual in question. The following functions can be activated with parameters:

Function code Function

03

Read Holding Registers

04

Read Input Registers

Table 18. Actual values

Actual values 30001-30098 40001-40098

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6.2.7 Example messages Example 1

Write the process data 42001…42003 with command 16 (Preset Multiple Registers).

Command Master ­ Slave:

ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO No. of registers HI No. of registers LO Byte count Data HI Data LO Data HI Data LO Data HI Data LO ERROR CRC HI CHECK CRC LO

01 hex 10 hex 07 hex D0 hex 00 hex 03 hex 06 hex 00 hex 01 hex 00 hex 00 hex 13 hex 88 hex C8 hex CB hex

Slave address 1 hex (= 1) Function 10 hex (= 16) Starting address 07d0 hex (= 2000)
Number of registers 0003 hex (= 3)
Byte count 06 hex (= 6) Data 1 = 0001 hex (= 1). Setting control word run bit to 1. Data 2 = 0000 hex (= 0). General control word 0. Data 3 = 1388 hex (= 5000), Speed Reference to 50.00% CRC field C8CB hex (= 51403)

Message frame: 01 10 07 D0 00 03 06 00 01 00 00 13 88 C8 CB

The reply to Preset Multiple Registers message is the echo of 6 first bytes.

Answer Slave ­ Master:

ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO No. of registers HI No. of registers LO ERROR CRC HI CHECK CRC LO

01 hex 10 hex 07 hex D0 hex 00 hex 03 hex F1 hex 01 hex

Slave address 1 hex (= 1) Function 10 hex (= 16) Starting address 07d0 hex (= 2000)
Number of registers 0003 hex (= 3)
CRC F101 hex (= 61697)

Reply frame: 01 10 07 D0 00 03 F1 01

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Example 2 Read the Process Data 42103…42104 with command 4 (Read Input Registers).

Command Master ­ Slave:
ADDRESS FUNCTION DATA Starting ddress HI
Starting address LO No. of registers HI No. of registers LO ERROR CRC HI CHECK CRC LO

01 hex 04 hex 08 hex 36 hex 00 hex 02 hex 93 hex A5 hex

Slave address 1 hex (= 1) Function 4 hex (= 4) Starting address 0836 hex (= 2102)
Number of registers 0002 hex (= 2)
CRC field B321 hex (= 45857)

Message frame: 01 04 08 36 00 02 93 A5

The reply to the Read Input Registers message contains the values of the read registers.

Answer Slave ­ Master:

ADDRESS FUNCTION DATA Byte count
Data HI Data LO Data HI Data LO ERROR CRC HI CHECK CRC LO

01 hex 04 hex 02 hex 13 hex 88 hex 09 hex C4 hex F0 hex
E9 hex

Slave address 1 hex (= 1) Function 4 hex (= 4) Byte count 4 hex (= 4) Speed reference = 1388 hex (=5000 => 50.00%)
Output Frequency = 09C4 hex (=2500 =>25.00Hz)
CRC field B321 hex (= 45857)

Reply frame: 01 04 02 13 88 09 C4 F0 E9

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6.3 Start-up test
Frequency converter application Choose Fieldbus (Bus/Comm) as the active control place (see Vacon NX User’s Manual, Chapter 7.3.3).
Master software
1. Set FB Control Word (MBaddr 42001) value to 1hex. 2. Frequency converter status is RUN. 3. Set FB Speed Reference (MBaddr 42003) value to 5000 (=50,00%). 4. The Actual value is 5000 and the frequency converter output frequency is 25,00 Hz. 5. Set FB Control Word (MBaddr 42001) value to 0hex. 6. Frequency converter status is STOP.

If FB Status Word (Addr 42101) bit 3 = 1 Status of frequency converter is FAULT.

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metasys n2

7. METASYS N2
7.1 Metasys N2 Protocol Introduction
The N2 communications protocol is used by Johnson Controls and others to connect terminal unit controllers to supervisory controllers. It is open to any manufacturer and based upon a simple ASCII protocol widely used in the process control industry.
The physical characteristics of the N2 bus are three wire RS-485 with a maximum of 100 devices over a 4,000 foot distance running at 9,600 bps. Logically, the N2 is a master-slave protocol, the supervisory controller normally being the master. Data is partitioned into common HVAC control objects, such as analogue input, analogue output, binary input and binary output. N2 messaging supports the reading, writing and overriding of these points. Additionally, there are messages defined to perform uploads and downloads of devices as well as direct memory reads and writes.
7.2 Metasys N2 interface
Features of the N2 Interface: · Direct control of Drive ( e.g. Run, Stop, Direction, Speed reference, Fault reset) · Full access to necessary parameters · Monitor Drive status (e.g. Output frequency, Output current, Fault code ) · In standalone operation, or should the polling stop, the overridden values are released after a specified period (about 10 minutes).
7.2.1 Analogue Input (AI)
All Analogue Input (AI) points have the following features: · Support Change of State (COS) reporting based on high and low warning limits. · Support Change of State (COS) reporting based on high and low alarm limits. · Support Change of State (COS) reporting based on override status. · Always considered reliable and never out of range. · Writing of alarm and warning limit values beyond the range that can be held by the drive’s internal variable will result in having that limit replaced by the “Invalid Float” value even though the message is acknowledged. The net result will be the inactivation of the alarm or warning (the same as if the original out of range value was used). · Overriding is supported from the standpoint that the “Override Active” bit will be set and the value reported to the N2 network will be the overridden value. However, the value in the drive remains unchanged. Therefore, the N2 system should be set up to disallow overriding AI points or have an alarm condition activated when an AI point is overridden. · Overriding an AI point with a value beyond the limit allowed by the drive’s internal variable will result in an “Invalid Data” error response and the override status and value will remain unchanged.
7.2.2 Binary Input (BI)
All Binary Input (BI) points have the following features: · Support Change of State (COS) reporting based on current state. · Support Change of State (COS) reporting based on alarm condition. · Support Change of State (COS) reporting based on override status. · Always considered reliable.
Overriding is supported from the standpoint that the “Override Active” bit will be set and the value reported to the N2 network will be the overridden value. However, the value in the drive remains un-

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changed. Therefore, the N2 system should be set up to disallow overriding BI points or have an alarm condition activated when a BI point is overridden.
7.2.3 Analogue Output (AO)
All Analogue Output (AO) points have the following features: · Support Change of State (COS) reporting based on override status. · Always considered reliable. · Overriding of the AO points is the method used to change a value. Overriding an AO point with a value beyond the limit allowed by the drive’s internal variable will result in an “Invalid Data” error response and the override status and value will remain unchanged. If the overridden value is beyond the drive’s parameter limit but within the range that will fit in the variable, an acknowledge response is given and the value will be internally clamped to its limit. · An AO point override copies the override value to the corresponding drive parameter. This is the same as changing the value on the keypad. The value is non-volatile and will remain in effect when the drive is turned off and back on. It also remains at this value when the N2 network “releases” the point. The N2 system always reads the current parameter value.
Note: On some N2 systems, the system will not poll the AO point when it is being overridden. In this case, the N2 system will not notice a change in value if the change is made with the keypad. To avoid this, set the point up as a “local control” type and release it once it has been overridden. In this way, the N2 system will monitor the value when not being overridden.
7.2.4 Binary Output (BO)
All Binary Output (BO) points have the follwoing features: · Support Change of State (COS) reporting based on override status. · Always considered reliable. · Overriding BO points control the drive. These points are input commands to the drive. When released, the drive’s internal value remains at its last overridden value.
7.2.5 Internal Integer (ADI)
All Internal Integer (ADI) points have the follwoing features: · Do not support Change of State (COS) reporting. · Can be overridden and the “Override Active” bit will be set. However, the Internal value is unchanged (Read Only).

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metasys n2

7.3 N2 POINT MAP

7.3.1 Analogue Inputs (AI)

NPT NPA

AI

1

AI

2

AI

3

AI

4

AI

5

AI

6

AI

7

AI

8

AI

9

AI

10

AI

11

AI

12

AI

13

AI

14

AI

15

AI

16

Description Speed Setpoint Output Speed Motor Speed Load (power) Megawatt Hours Motor Current Bus Voltage Motor Volts Heatsink Temperature Motor Torque Operating Days (trip) Operating Hours (trip) Kilowatt Hours (trip) Torque Reference 1) Motor Temperature Rise1)
FBProcessDataOut1 2)

AI

17

FBProcessDataOut2 2)

AI

18

FBProcessDataOut3 2)

AI

19

FBProcessDataOut4 2)

AI

20

FBProcessDataOut5 2)

AI

21

FBProcessDataOut6 2)

AI

22

FBProcessDataOut7 2)

AI

23

Table 19.

FBProcessDataOut8 2)

Units Hz Hz Rpm % MWh A V V ° C % Day Hour kWh %
%
-32768 to +32767 -32768 to +32767 -32768 to +32767 -32768 to +32767 -32768 to +32767 -32768 to +32767 -32768 to +32767 -32768 to +32767

Note 2 decimals 2 decimals 0 decimal 1 decimal Total Counter 2 decimal 0 decimal 1 decimal 0 decimal 1 decimal 0 decimal 0 decimal Trip Counter 1 decimal 1 decimal
0 decimal
0 decimal
0 decimal
0 decimal
0 decimal
0 decimal
0 decimal
0 decimal

1. Torque Reference (AI-14) and Motor Temperature Rise (AI-15) NOT supported in NXL 2) These analogue inputs are application specific.

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7.3.2 7.3.3

Binary Inputs (BI)

NPT NPA

BI

1

BI

2

BI

3

BI

4

BI

5

BI

6

BI

7

BI

8

BI

9

BI

10

BI

11

BI

12

BI

13

BI

14

BI

15

Table 20.

Description Ready Run Direction Faulted Warning Ref. Frequency reached Motor running zero speed General 0 3) General 1 3) General 2 3) General 3 3) General 4 3) General 5 3) General 6 3) General 7 3)

0 = Not Ready Stop Clockwise Not Faulted Not Warning False False 0 0 0 0 0 0 0 0

1 = Ready Run Counterclockwise Faulted Warning True True 1 1 1 1 1 1 1 1

3. These binary inputs are application specific. They are read from the drives General Status Word.

Analogue Outputs (AO)

NPT NPA

AO

1

AO

2

AO

3

AO

4

AO

5

AO

6

AO

7

AO

8

AO

9

AO

10

Table 21.

Description Comms Speed
Current Limit
Minimum Speed Maximum Speed Accel Time Decel Time FBProcessDataIN 1 4) FBProcessDataIN 2 4) FBProcessDataIN 3 4) FBProcessDataIN 4 4)

Units % A
Hz Hz s s -32768 to +32767 -32768 to +32767 -32768 to +32767 -32768 to +32767

4. These Analogue Outputs are application specific.

Note 2 decimals 2 decimals
2 decimals 2 decimals 1 decimal 1 decimal 2 decimals 2 decimals 2 decimals 2 decimals

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7.3.4 7.3.5

Binary Outputs (BO)

NPT NPA BO 1 BO 2 BO 3 BO 4 BO 5 BO 6 BO 7 BO 8 BO 9 BO 10 BO 11
BO 12
BO 13
BO 14
BO 15
BO 16
Table 22.

Description Comms Start/Stop Comms Forward/Reverse Reset Fault FBFixedControlWord Bit_3 5) FBFixedControlWord Bit_4 5) FBFixedControlWord Bit_5 5) FBFixedControlWord Bit_6 5) FBFixedControlWord Bit_7 5) FBFixedControlWord Bit_8 5) FBFixedControlWord Bit_9 5) FBFixedControlWord Bit_10
5)
FBFixedControlWord Bit_11
5)
FBFixedControlWord Bit_12
5)
FBFixedControlWord Bit_13
5)
FBFixedControlWord Bit_14
5)
FBFixedControlWord Bit_15
5)

0 = Stop Forward N/A –
–
–
–
–
–
–

5. These Binary Outputs are application specific.

Internal Integers (ADI)

NPT NPA
ADI 1 Table 23.

Description Active Fault Code

Units –

metasys n2
1 = Start Reverse Reset –
–
–
–
–
–

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8. FAULT TRACKING
The table below presents the faults related to the RS-485 option board. For more information, see also Vacon NX User’s Manual, Chapter 9. The RS-485 option board status LEDs have been described in more detail in Chapter 3.6.

Fault code
37 38 39 40
53
54

Fault
Device change Device added Device removed Device unknown Fieldbus fault
Slot fault

Possible cause
Option board changed. Option board added. Option board removed. Unknown option board.
The data connection between the Modbus/ N2 Master and the RS-485 option board is broken Defective option board or slot

Table 24. RS-485 option board faults

Correcting measures
Reset Reset Reset
Check the installation. If installation is correct contact the nearest Vacon distributor. Check the board and slot. Contact the nearest Vacon distributor.

You can define with parameters how the frequency converter shall react to certain faults:

Code

Parameter

Min

P2.7.22

Response to fieldbus fault

0

Max

Unit

3

P2.7.23

Response to slot fault

0

3

Table 25. Frequency converter responses to faults

Step 1
1

Default 0
0

ID

Note

0=No response

733

1=Warning 2=Fault,stop acc. to 2.4.7

3=Fault,stop by coasting

0=No response

734

1=Warning 2=Fault,stop acc. to 2.4.7

3=Fault,stop by coasting

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APPENDIX 1

metasys n2

Process Data OUT (Slave to Master)
The Fieldbus Master can read the frequency converter’s actual values using process data variables. Basic, Standard, Local/Remote Control, Multi-Step Speed Control, PID control and Pump and fan control applications use process data as follows:

ID

Data

Value

2104

Process data OUT 1 Output Frequency

2105

Process data OUT 2 Motor Speed

2106

Process data OUT 3 Motor Current

2107

Process data OUT 4 Motor Torque

2108

Process data OUT 5 Motor Power

2109

Process data OUT 6 Motor Voltage

2110

Process data OUT 7 DC link voltage

2111

Process data OUT 8 Active Fault Code

Table 26. Process data OUT variables

Unit Scale

Hz 0,01 Hz

rpm 1 rpm

A

0,1 A

%

0,1 %

%

0,1 %

V

0,1 V

V

1 V

–

–

The Multipurpose Control application has a selector parameter for every Process Data. The monitoring values and drive parameters can be selected using the ID number (see NX All in One Application Manual, Tables for monitoring values and parameters). Default selections are as in the table above.

Process Data IN (Master to Slave) ControlWord, Reference and Process Data are used with All-inOne applications as follows:

Basic, Standard, Local/Remote Control and Multi-Step Speed Control applications

ID 2003 2001
2004­2011 Table 27.

Data Reference ControlWord
PD1 ­ PD8

Value

Unit

Speed Reference

%

Start/Stop Command –

Fault reset Command

Not used

–

Scale 0.01% –
–

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Multipurpose Control application

ID 2003 2001
2004 2005 2006­2011 Table 28.

Data

Value

Unit

Reference

Speed Reference

%

ControlWord

Start/Stop Command –

Fault reset Command

Process Data IN1 Torque Reference

%

Process Data IN2 Free Analogia INPUT %

PD3 ­ PD8

Not Used

–

PID control and Pump and fan control applications

Scale 0.01% –
0.1% 0.01% –

ID 2003 2001
2004
2005
2006
2007­2011 Table 29

Data

Value

Unit

Reference

Speed Reference

%

ControlWord

Start/Stop Command –

Fault reset Command

Process Data IN1 Reference for PID

%

controller

Process Data IN2 Actual Value 1 to PID %

controller

Process Data IN3 Actual Value 2 to PID %

controller

PD4­PD8

Not Used

–

Scale 0.01% –
0.01%
0.01%
0.01%
–

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Find your nearest Vacon office on the Internet at:
www.vacon.com

Manual authoring: documentation@vacon.com
Vacon Plc. Runsorintie 7 65380 Vaasa Finland
Subject to change without prior notice © 2012 Vacon Plc.

Document ID: Rev. A

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