iSMA CONTROLLI SfAR-1M-4DI User manual

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DMP269en | 3rd Issue rev. 1 | 05/2022
SfAR-1M-4DI
User Manual
Expansion Module - 4 Digital Inputs
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DMP269en | 3rd Issue rev. 1 | 05/2022
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Table of Contents
1 Introduction ............................................................................................................................. 3
1.1 Revision History................................................................................................................................3
2 Safety Rules.............................................................................................................................. 4
3 Module Features..................................................................................................................... 5
3.1 Purpose and Description of the Module ...................................................................................5
3.2 Technical Specification ...................................................................................................................5
3.3 Dimensions .......................................................................................................................................6
4 Communication....................................................................................................................... 7
4.1 Grounding and Shielding...............................................................................................................7
4.2 Network Termination......................................................................................................................7
4.3 Types of Modbus Functions..........................................................................................................7
4.4 Communication Settings................................................................................................................8
4.4.1 Default Settings..........................................................................................................................8
4.5 Configuration Registers..................................................................................................................8
5 Indicators................................................................................................................................ 10
6 Connections........................................................................................................................... 11
6.1 Block Diagram ............................................................................................................................... 11
6.2 Power Supply Connection .......................................................................................................... 11
6.2.1 DC Power Connection ........................................................................................................... 11
6.2.2 AC Power Connection............................................................................................................ 12
6.3 Communication Bus Connection.............................................................................................. 12
6.4 Connection of Digital Inputs ...................................................................................................... 12
7 Module Registers.................................................................................................................. 13
7.1 Registered Access......................................................................................................................... 13
7.2 Bit Access........................................................................................................................................ 14
8 Configuration Software ....................................................................................................... 16

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DMP269en | 3rd Issue rev. 1 | 05/2022
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1 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.
1.1 Revision History
Rev. Date Description
3.1 25 May 2022 Rebranded
Table 1. Revision history
WARNING!
Failure to follow instructions can result in equipment damage or impede the use of
the hardware or software.

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2 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.

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3 Module Features
3.1 Purpose and Description of the Module
The SfAR-1M-4DI module is an innovative device that provides a simple and cost-effective
extension of the number of lines of input in popular PLCs.
The module has 4 digital inputs with configurable timer/counter option, which allows to
connect two encoders. All inputs are isolated from the logic with optocouplers. Each
channel can be individually configured in one of several modes.
The 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,
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.
3.2 Technical Specification
Power Supply Voltage 10-38 V DC; 10-28 V AC
Power consumption (with active
Modbus transmission and high
state on all inputs)
1 W at 24 V DC
2 VA at 24 V AC
Digital Inputs No. of inputs 4
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. 4
Resolution 32-bit
Frequency 1 kHz (max.)
Impulse width 500 μs (min.)

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Temperature Work -20°C to +65°C
Storage -40°C to +85°C
Connectors Power supply 3 pin
Communication 3 pin
Inputs 2 x 3 pin
Configuration mini USB
Size Height 90 mm
Length 56.4 mm
Width 17.5 mm
Interface RS485 Up to 128 devices
Table 2. Technical specification
3.3 Dimensions
The appearance and dimensions of the module are shown below. The module is
mounted directly to the rail in the DIN industry standard.
Figure 1. Dimensions

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4 Communication
4.1 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.
4.2 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.
4.3 Types of Modbus Functions
There are 4 types of Modbus functions supported by the SfAR modules.
Type Beginning Address Variable Access Modbus Command
1 00001 Digital Outputs Bit
Read/write
1, 5, 15
2 10001 Digital Inputs Bit
Read
2
3 30001 Input Registers Registered
Read
3

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Type Beginning Address Variable Access Modbus Command
4 40001 Output Registers Registered
Read/write
4, 6, 16
Table 3. Types of Modbus functions supported by the module
4.4 Communication Settings
The 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.
4.4.1 Default Settings
Parameter Name Value
Address 1
Baud rate 19200
Parity No
Data bits 8
Stop bits 1
Reply delay [ms] 0
Modbus type RTU
Table 4. Default settings
4.5 Configuration Registers
Modbus Address Decimal Address Hex Address Name Values
40003 2 0x02 Baud Rate 0 – 2400
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 bits

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Modbus Address Decimal Address Hex Address Name Values
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
Table 5. Configuration registers

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5 Indicators
Figure 2. Indicators
Indicator Description
ON The LED indicates that the module is correctly powered
TX The LED lights up when the unit received the correct packet and sends
the answer
DI1, 2, 3, 4 The LED indicates that on the input is high state
Table 6. Description of indicators

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6 Connections
6.1 BlockDiagram
Figure 3. Block diagram
6.2 Power Supply Connection
6.2.1 DC Power Connection
Figure 4. DC power connection

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6.2.2 AC Power Connection
Figure 5. AC power connection
6.3 Communication Bus Connection
Figure 6. Communication bus connection
6.4 Connection of Digital Inputs
Figure 7. Connection of digital inputs

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7 Module Registers
7.1 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 Address Read Module address
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)
40009 8 0x08 Watchdog Read/write Watchdog
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
40058 57 0x39 Counter 3 MSR Read/write

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Modbus
Address
Decimal
Address
Hex
Address
Register Name Access Description
40059 58 0x3A Counter 4 LSR Read/write 32-bit counter 4
40060 59 0x3B Counter 4 MSR Read/write
40061 60 0x3C CCounter 1 LSR Read/write 32-bit value of
captured counter 1
40062 61 0x3D CCounter 1 MSR Read/write
40063 62 0x3E CCounter 2 LSR Read/write 32-bit value of
captured counter 2
40064 63 0x3F CCounter 2 MSR Read/write
40065 64 0x40 CCounter 3 LSR Read/write 32-bit value of
captured counter 3
40066 65 0x41 CCounter 3 MSR Read/write
40067 66 0x42 CCounter 4 LSR Read/write 32-bit value of
captured counter 4
40068 67 0x43 CCounter 4 MSR Read/write
40069 68 0x44 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
40070 69 0x45 Counter Config 2 Read/write
40071 70 0x46 Counter Config 3 Read/write
40072 71 0x47 Counter Config 4 Read/write
40073 72 0x48 Catch Read/write Catch counter
40074 73 0x49 Status Read/write Captured counter
Table 7. Registered access
7.2 Bit Access
Modbus
Address
Dec Address Hex
Address
Register
Name
Access Description
10801 800 0x320 Input 1 Read Input 1 state
10802 801 0x321 Input 2 Read Input 2 state
10803 802 0x322 Input 3 Read Input 3 state

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Modbus
Address
Dec Address Hex
Address
Register
Name
Access Description
10804 803 0x323 Input 4 Read Input 4 state
1153 1152 0x480 Capture 1 Read/write Capture counter 1
1154 1153 0x481 Capture 2 Read/write Capture counter 2
1155 1154 0x482 Capture 3 Read/write Capture counter 3
1156 1155 0x483 Capture 4 Read/write Capture counter 4
1169 1168 0x490 Captured 1 Read/write Captured value of
counter 1
1170 1169 0x491 Captured 2 Read/write Captured value of
counter 2
1171 1170 0x492 Captured 3 Read/write Captured value of
counter 3
1172 1171 0x493 Captured 4 Read/write Captured value of
counter 4
Table 8. Bit access

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8 Configuration Software
The SfAR Configurator is the type of 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 via the USB cable. The module does not require any
drivers.
Figure 8. PC connection
The SfAR Configurator is a universal software, where it is possible to configure all available
modules.
Figure 9. The SfAR Configurator