iSMA CONTROLLI SfAR-S-16DI 16 Digital Inputs Expansion Module User Manual

iSMA CONTROLLI SfAR-S-16DI 16 Digital Inputs Expansion Module

Introduction

Thank you for choosing our product.
This manual will help you with proper handling and operating of the device.
The information included in this manual have been prepared with utmost care by our professionals and serve as a description of the product without incurring any liability for the purposes of commercial law. This information does not discharge you from the liability of your own judgement and verification.
We reserve the right to change product specifications without notice.
Please read the instructions carefully and follow the recommendations concluded therein.

WARNING!
Failure to follow instructions can result in equipment damage or impede the use of the hardware or software.

Revision History

Safety Rules

• Improper wiring of the product can damage it and lead to other hazards. Make sure that the product has been correctly wired before turning the power on.
• Before wiring or removing/mounting the product, make sure to turn the power off. Failure to do so might cause an electric shock.
• Do not touch electrically charged parts such as power terminals. Doing so might cause an electric shock.
• Do not disassemble the product. Doing so might cause an electric shock or faulty operation.
• Use the product only within the operating ranges recommended in the specification (temperature, humidity, voltage, shock, mounting direction, atmosphere, etc.). Failure to do so might cause a fire or faulty operation.
• Firmly tighten the wires to the terminal. Failure to do so might cause a fire.
• Avoid installing the product in close proximity to high-power electrical devices and cables, inductive loads, and switching devices. Proximity of such objects may cause an uncontrolled interference, resulting in an instable operation of the product.
• Proper arrangement of the power and signal cabling affects the operation of the entire control system. Avoid laying the power and signal wiring in parallel cable trays. It can cause interferences in monitored and control signals.
• It is recommended to power controllers/modules with AC/DC power suppliers. They provide better and more stable insulation for devices compared to AC/AC transformer systems, which transmit disturbances and transient phenomena like surges and bursts to devices. They also isolate products from inductive phenomena from other transformers and loads.
• Power supply systems for the product should be protected by external devices limiting overvoltage and effects of lightning discharges.
• Avoid powering the product and its controlled/monitored devices, especially high power and inductive loads, from a single power source. Powering devices from a single power source causes a risk of introducing disturbances from the loads to the control devices.
• If an AC/AC transformer is used to supply control devices, it is strongly recommended to use a maximum 100 VA Class 2 transformer to avoid unwanted inductive effects, which are dangerous for devices.
• Long monitoring and control lines may cause loops in connection with the shared power supply, causing disturbances in the operation of devices, including external communication. It is recommended to use galvanic separators.
• To protect signal and communication lines against external electromagnetic interferences, use properly grounded shielded cables and ferrite beads.
• Switching the digital output relays of large (exceeding specification) inductive loads can cause interference pulses to the electronics installed inside the product. Therefore, it is recommended to use external relays/contactors, etc. to switch such loads. The use of controllers with triac outputs also limits similar overvoltage phenomena.
• Many cases of disturbances and overvoltage in control systems are generated by switched, inductive loads supplied by alternating mains voltage (AC 120/230 V). If they do not have appropriate built-in noise reduction circuits, it is recommended to use external circuits such as snubbers, varistors, or protection diodes to limit these effects.

Module Features

Purpose and Description of the Module

The SfAR-S-16DI module is an innovative device that provides a simple and cost-effective extension of the number of inputs in popular PLCs.
The module has 16 digital inputs with configurable timer/counter option. In addition, terminals IN1 and IN2, and IN3 and IN4 can be used to connect two encoders. All inputs and outputs are isolated from the power supply and RS485 port using optocouplers. Each channel can be individually configured in one of several modes.

This module is connected to the RS485 bus with a twisted-pair wire. Communication is via Modbus RTU or Modbus ASCII. The use of 32-bit ARM core processor provides fast processing and quick communication. The baud rate is configurable from 2400 to 115200.
The module is designed for mounting on a DIN rail in accordance with DIN EN 5002.

The module is equipped with a set of LEDs to indicate the status of inputs and outputs, power supply, and communication, which is useful for diagnostic purposes and helping to find errors.

Module configuration is done via USB by using a dedicated computer program. It also allows for changing the parameters using the Modbus protocol or set the Modbus address using the DIP switches under the front panel.

Technical Specification

Power consumption

(with active Modbus transmission and high state on all inputs)

| 2.4 W at 24 V DC
3 VA at 24 V AC
Digital Inputs| No. of inputs| 16
Voltage range| 0-36 V
Low state ‘0’| 0-3 V
High state ‘1’| 6-36 V
Input impedance| 4 kΩ
Isolation| 1500 Vrms
Input type| PNP or NPN
Counters| No. of counters| 16
Resolution| 32-bit
Frequency| 1 kHz (max.)
 | Impulse width| 500 μs (min.)
---|---|---
Temperature| Work| -10°C to +50°C (14°F to 122°F)
Storage| -40°C to +85°C (-40°F to 185°F)
Connectors| Power supply| 2 pin
Communication| 3 pin
Inputs| 2 x 10 pin
Configuration| mini USB
Size| Height| 119.1 mm (4.689 in)
Length| 110.9 mm (4.366 in)
Width| 22.7 mm (0.894 in)
Interface| RS485| Up to 128 devices

Dimensions
The appearance and dimensions of the module are shown below. The module is mounted directly to the rail in the DIN industry standard. Power connectors, communication, and I/Os are at the bottom and top of the module. USB connector configuration and indicators are located on the front of the module.

Communication

Grounding and Shielding
In most cases, I/O modules will be installed in an enclosure along with the other devices, which generate electromagnetic radiation. Relays, contactors, transformers, motor invertors, etc., are examples of such devices. Radiation can induce electrical noise into both power and signal lines, as well as direct radiation into the module. Whether or not the SfAR modules are immune to such effects, the interferences must be suppressed at their source if possible to ensure the proper functioning of the entire system.

Appropriate grounding, shielding and other protective steps should be taken at the installation stage to prevent these effects. It is recommended to at least follow the rules below:

• line power cables must be routed with spatial separation from signal and data transmission cables;
• analog and digital signal cables should also be separated;
• it is recommended to use shielded cables for analog signals, cable shields should not be interrupted by intermediate terminals;
• the shielding should be earthed directly after the cable enters the cabinet.

It is recommended to install interference suppressors when switching inductive loads (e.g., coils of contactors, relays, solenoid valves). RC snubbers or varistors are suitable for AC voltage and freewheeling diodes for DC voltage loads. The suppressing elements must be connected as close to the coil as possible.

Network Termination
Transmission line effects often present problems for data communication networks. These problems include reflections and signal attenuation.
To eliminate the presence of reflections of signal from the end of the cable, the cable must be terminated at both ends with a resistor across the line adequate to its characteristic impedance. Both ends must be terminated since the propagation is bidirectional. In case of an RS485 twisted pair cable, this termination is typically 120 Ω.

Setting Module Address in RS485 Modbus Network
The following table shows how to set DIP switches to determine the address of the module. The module address is set with the DIP switches in the range of 0 to 31. Addresses from 32 to 255 can be set via RS485 or USB and using dedicated software tool.

Types of Modbus Functions
There are 4 types of Modbus functions supported by the SfAR modules.

Communication Settings
Data stored in the module’s memory is given in the 16-bit registers. The access to registers is via Modbus RTU or Modbus ASCII.

Default Settings
The default configuration can be restored with the switch, SW6.

Restoring Default Configuration
To restore the default configuration, follow the steps below:

• turn the power off;
• turn the DIP switch SW6 on;
• turn the power on;
• when power and the communication LED are lit, turn the switch SW6 off

WARNING! After restoring the default configuration, all values stored in the registers are cleared as well.

Configuration Registers

1 – 4800

2 – 9600

3 – 19200

4 – 38400

5 – 57600

6 – 115200

other – value * 10

40005| 4| 0x04| Parity| 0  – none

1  – odd

2  – even

3  – always 0

4  – always 1

40004| 3| 0x03| Stop Bits| 1 – one stop bit 2 – two stop bit
40004| 3| 0x03| Data Bits| 7  – 7 data bits

8  – 8 data bits

40006| 5| 0x05| Response Delay| Time in ms
40007| 6| 0x06| Modbus Mode| 0  – RTU

1  – ASCII

Indicators

sends the answer
Inputs State| The LED indicates that on the input is high state

Connections

Block Diagram

Power Supply Connection
DC Power Connection

AC Power Connection

Communication Bus Connection

Digital Inputs Connection
Connection of Encoder

Connection of Input

Quick Connector
Quick Connector is a unique feature of modules that allows for quickly connecting a group of devices with a flat ribbon cable. Thanks to this solution, it is enough to connect power and RS485 communication to one of the devices in the group, and the others will be powered and communicated with ribbon cable.

The Quick Connector is sufficient to connect up to 10 devices next to each other. It is important that the various types of modules in the SfAR-S family can be connected with the ribbon cable.

DIP Switch

Input Filter

Digital inputs allow connection of the AC signal. However, due to the fact that these inputs are fast and allow counting pulses at 1 kHz frequency, it is not possible to use them to monitor the presence of a variable frequency signal like 50Hz because, depending on the moment at which the input state is read with the Modbus protocol, different results can be obtained despite the fact that AC voltage is still present. To be able to monitor the AC signals, the possibility of filtering the digital inputs has been introduced. Filtration works in a way that the high state occurs if the voltage is maintained for at least 40 ms. The low state appears when there is no voltage for at least 80 ms.
The filter can be turned on for each input of the device independently using the 40018 register.

Module Registers

Registered Access

Modbus Address| Decimal Address| Hex Address| Register Name| Access| Description
---|---|---|---|---|---
30001| 0| 0x00| Version/Type| Read| Version and type of the device
30002| 1| 0x01| Switches| Read| Switches state
40003| 2| 0x02| Baud Rate| Read/write| RS485 baud rate
40004| 3| 0x03| Stop Bits & Data Bits| Read/write| No. of stop bits & data bits
40005| 4| 0x04| Parity| Read/write| Parity bit
40006| 5| 0x05| Response Delay| Read/write| Response delay in ms
40007| 6| 0x06| Modbus Mode| Read/write| Modbus mode (ASCII or RTU)
40018| 17| 0x11| Inputs Filter| Read/write| Configuration of the inputs filter
40033| 32| 0x20| Received Packets LSR (Least Significant Register)| Read/write| No. of received packets
40034| 33| 0x21| Received Packets MSR (Most Significant Register)| Read/write
40035| 34| 0x22| Incorrect Packets LSR| Read/write| No. of received packets with error
40036| 35| 0x23| Incorrect Packets MSR| Read/write
40037| 36| 0x24| Sent Packets LSR| Read/write| No. of sent packets
40038| 37| 0x25| Sent Packets MSR| Read/write
30051| 50| 0x32| Inputs| Read| Inputs state
40053| 52| 0x34| Counter 1 LSR| Read/write| 32-bit counter 1
40054| 53| 0x35| Counter 1 MSR| Read/write
40055| 54| 0x36| Counter 2 LSR| Read/write| 32-bit counter 2
40056| 55| 0x37| Counter 2 MSR| Read/write
40057| 56| 0x38| Counter 3 LSR| Read/write| 32-bit counter 3
Modbus Address| Decimal Address| Hex Address| Register Name| Access| Description
---|---|---|---|---|---
40058| 57| 0x39| Counter 3 MSR| Read/write|
40059| 58| 0x3A| Counter 4 LSR| Read/write| 32-bit counter 4
40060| 59| 0x3B| Counter 4 MSR| Read/write
40061| 60| 0x3C| Counter 5 LSR| Read/write| 32-bit counter 5
40062| 61| 0x3D| Counter 5 MSR| Read/write
40063| 62| 0x3E| Counter 6 LSR| Read/write| 32-bit counter 6
40064| 63| 0x3F| Counter 6 MSR| Read/write
40065| 64| 0x40| Counter 7 LSR| Read/write| 32-bit counter 7
40066| 65| 0x41| Counter 7 MSR| Read/write
40067| 66| 0x42| Counter 8 LSR| Read/write| 32-bit counter 8
40068| 67| 0x43| Counter 8 MSR| Read/write
40069| 68| 0x44| Counter 9 LSR| Read/write| 32-bit counter 9
40070| 69| 0x45| Counter 9 MSR| Read/write
40071| 70| 0x46| Counter 10 LSR| Read/write| 32-bit counter 10
40072| 71| 0x47| Counter 10 MSR| Read/write
40073| 72| 0x48| Counter 11 LSR| Read/write| 32-bit counter 11
40074| 73| 0x49| Counter 11 MSR| Read/write|
40075| 74| 0x4A| Counter 12 LSR| Read/write| 32-bit counter 12
40076| 75| 0x4B| Counter 12 MSR| Read/write
40077| 76| 0x4C| Counter 13 LSR| Read/write| 32-bit counter 13
40078| 77| 0x4D| Counter 13 MSR| Read/write
40079| 78| 0x4E| Counter 14 LSR| Read/write| 32-bit counter 14
40080| 79| 0x4F| Counter 14 MSR| Read/write
40081| 80| 0x50| Counter 15 LSR| Read/write| 32-bit counter 15
40082| 81| 0x51| Counter 15 MSR| Read/write
Modbus Address| Decimal Address| Hex Address| Register Name| Access| Description
---|---|---|---|---|---
40083| 82| 0x52| Counter 16 LSR| Read/write| 32-bit counter 16
40084| 83| 0x53| Counter 16 MSR| Read/write
40085| 84| 0x54| CCounter 1 LSR| Read/write| 32-bit value of captured counter 1
40086| 85| 0x55| CCounter 1 MSR| Read/write
40087| 86| 0x56| CCounter 2 LSR| Read/write| 32-bit value of captured counter 2
40088| 87| 0x57| CCounter 2 MSR| Read/write
40089| 88| 0x58| CCounter 3 LSR| Read/write| 32-bit value of captured counter 3
40090| 89| 0x59| CCounter 3 MSR| Read/write
40091| 90| 0x5A| CCounter 4 LSR| Read/write| 32-bit value of captured counter 4
40092| 91| 0x5B| CCounter 4 MSR| Read/write
40093| 92| 0x5C| CCounter 5 LSR| Read/write| 32-bit value of captured counter 5
40094| 93| 0x5D| CCounter 5 MSR| Read/write
40095| 94| 0x5E| CCounter 6 LSR| Read/write| 32-bit value of captured counter 6
40096| 95| 0x5F| CCounter 6 MSR| Read/write
40097| 96| 0x60| CCounter 7 LSR| Read/write| 32-bit value of captured counter 7
40098| 97| 0x61| CCounter 7 MSR| Read/write
40099| 98| 0x62| CCounter 8 LSR| Read/write| 32-bit value of captured counter 8
40100| 99| 0x63| CCounter 8 MSR| Read/write
40101| 100| 0x64| CCounter 9 LSR| Read/write| 32-bit value of captured counter 9
40102| 101| 0x65| CCounter 9 MSR| Read/write
40103| 102| 0x66| CCounter 10 LSR| Read/write| 32-bit value of captured counter 10
40104| 103| 0x67| CCounter 10 MSR| Read/write
40105| 104| 0x68| CCounter 11 LSR| Read/write| 32-bit value of captured counter 11
40106| 105| 0x69| CCounter 11 MSR| Read/write
40107| 106| 0x6A| CCounter 12 LSR| Read/write| 32-bit value of captured counter 12
40108| 107| 0x6B| CCounter 12 MSR| Read/write
Modbus Address| Decimal Address| Hex Address| Register Name| Access| Description
---|---|---|---|---|---
40109| 108| 0x6C| CCounter 13 LSR| Read/write| 32-bit value of captured counter 13
40110| 109| 0x6D| CCounter 13 MSR| Read/write
40111| 110| 0x6E| CCounter 14 LSR| Read/write| 32-bit value of captured counter 14
40112| 111| 0x6F| CCounter 14 MSR| Read/write
40113| 112| 0x70| CCounter 15 LSR| Read/write| 32-bit value of captured counter 15
40114| 113| 0x71| CCounter 15 MSR| Read/write
40115| 114| 0x72| CCounter 16 LSR| Read/write| 32-bit value of captured counter 16
40116| 115| 0x73| CCounter 16 MSR| Read/write
40117| 116| 0x74| Counter Config 1| Read/write| Counter configuration

+1 – time

measurement (if 0 counting impulses)

+2 – autocatch

counter every 1 sec

+4 – catch value when

input low

+8 – reset counter

after catch

+16 – reset counter if

input low

+32 – encoder

40118| 117| 0x75| Counter Config 2| Read/write
40119| 118| 0x76| Counter Config 3| Read/write
40120| 119| 0x77| Counter Config 4| Read/write
40121| 120| 0x78| Counter Config 5| Read/write
40122| 121| 0x79| Counter Config 6| Read/write
40123| 122| 0x7A| Counter Config 7| Read/write
40124| 123| 0x7B| Counter Config 8| Read/write
40125| 124| 0x7C| Counter Config 9| Read/write
40126| 125| 0x7D| Counter Config 10| Read/write
40127| 126| 0x7E| Counter Config 11| Read/write
40128| 127| 0x7F| Counter Config 12| Read/write
40129| 128| 0x80| Counter Config 13| Read/write
40130| 129| 0x81| Counter Config 14| Read/write
40131| 130| 0x82| Counter Config 15| Read/write
40132| 131| 0x83| Counter Config 16| Read/write
40133| 132| 0x84| Catch| Read/write| Catch counter
Modbus Address| Decimal Address| Hex Address| Register Name| Access| Description
---|---|---|---|---|---
40134| 133| 0x85| Status| Read/write| Captured counter

Bit Access

Configuration Software

SfAR Configurator is a software, which is designed to set the communication module registers over Modbus network as well as to read and write the current value of other registers of the module. It is a convenient way to test the system as well as to observe real-time changes in the registers.
Communication with the module is done via a USB cable. The module does not require any drivers.

The SfAR Configurator is a universal software, where it is possible to configure all available modules.

www.ismacontrolli.com

References

• iSMA CONTROLLI S.p.A.

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