valpes DSBA3305 MODBUS-RTU Electric Actuator Installation Guide

valpes DSBA3305 MODBUS-RTU Electric Actuator

Description

MODBUS-RTU is a serial fieldbus communication protocol to automate up to 247 electric actuators.
This protocol is non-proprietary and cheap to build. This one of the most used industrial fieldbuses because of its reliability.

Bus type| RS485
Protocol| MODBUS RTU, 16 bit CRC
Baud| 9600
Data bits| 8
Parity| none
Stop bit| 1
Distance| 1200 m
Maximum number of slave devices per line/segment| 31
Total number of slave devices| 247 with repeater
Address range| 1-247 (0=broadcast)

Fonctions utilisables

• 03 (0x03) Read Holding Registers: This function code is used to read the contents of a contiguous block of holding registers in a remote device.
• 06 (0x06) Write Single Register: This function code is used to write a single holding register in a remote device.
• 16 (0x10) Write Multiple registers: This function code is used to write a block of contiguous registers in a remote device.

23 (0x17) Read/Write Multiple registers
This function code performs a combination of one read operation and one write operation in a single MODBUS transaction. The write operation is performed before the read.
The read possible registers are addresses from @0 to @41 (decimal) – same as read 0x03 function
The write possible registers are addresses from @20 to @29 (decimal) – same as write 0x10 function
Broadcast
broadcast is address 0, frame is understood but NO RESPONSE of the slave. No exception generated on address 0.

MODBUS-RTU network structure

A RS485 line allows the association of a PLC (master node) to 31 devices (slave nodes) over a maximum of 1200 meters MODBUS-RTU protocol provides addressing capacity for up to 247 Inputs, also, it’s possible to use repeaters to connect several lines and automate up to 247 actuators over a greater distance.

Single line network (one RS485 line)

Multiple-segmented network

Multiple-segmented star network

ER+, VR, VS, LT, DV, VRX and VSX models

Standard models (G00)

Electric connection

Connect the MODBUS communication wire on RS485 terminal (0-A-B). Connect the power supply on the connector Ca

• 1 : neutral (50/60 Hz) or negative (DC)
• 3 : phase (50/60 Hz) or positive (DC)

Register table

Register|

Function

| R/W| Bytes|

Description

|

Minimum value

|

Default value

|

Maximum value

---|---|---|---|---|---|---|---
1| 0x03| R| 2| number of cycles| 0| 0| 65535
2| 0x03| R| 2| Operating time| 0| 0| 65535
3| 0x03| R| 2| Operating time| 0| 0| 3599
4| 0x03| R| 2| Software version| 0| 340| 65535
5| 0x03| R| 2| EEPROM errors number| 0| 0| 255
6| 0x03| R| 2| Detected defaults number (Intensity limitation + security temperature)| 0| 0| 65535
7| 0x03| R| 2| Heating status (1=heating; 2=off; 0=non mesured)| 0| 2| 2
10| 0x03| R| 2| Max recorded temperature| 0| 0| 99
11| 0x03| R| 2| Min recorded temperature| 0| 99| 99
12| 0x03| R| 2| Actuator temperature| 0| 0| 99
13| 0x03| R| 2| Position flags|  |  |
14| 0x03| R| 2| Error flags|  |  |

28

|

0x03/0x10

|

R/W

|

2

| Actuator adress

The addresses from 248 to 254 are not available. The address 255 is

|

1

|

247

|

255

 |  |  |  | available but allowes neither action nor response.|  |  |
35| 0x03/0x06| R/W| 2| Actuator operation : STOP (0) ; OPEN (1) ; CLOSE (2)| 0| 0| 2

BBPR (G00) and 3-POSITION-BBPR (GFS) models

Electric connection

Connect the MODBUS communication wire on the RS485 terminal of the BBPR board (0-A-B) Connect the power supply on the terminal Ca of the main board (see previous page).

• 1 : neutral (50/60 Hz) or negative (DC)
• 3 : phase (50/60 Hz) or positive (DC)

Register table

POSI-BBPR (GPS) models

VT PLUS and MT models (all versions)

Register table

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