iSMA CONTROLLI SfAR-1M-1AI1DO User manual

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DMP264en | 3rd Issue rev. 1 | 05/2022
SfAR-1M-1AI1DO
User Manual
Expansion Module - 1 Analog Input, 1
Digital Output
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SfAR-1M-1AI1DO User Manual
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DMP264en | 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 .......................................................................................................................................7
4 Communication....................................................................................................................... 8
4.1 Grounding and Shielding...............................................................................................................8
4.2 Network Termination......................................................................................................................8
4.3 Types of Modbus Functions..........................................................................................................8
4.4 Communication Settings................................................................................................................9
4.5 Default Settings................................................................................................................................9
4.6 Configuration Registers..................................................................................................................9
5 Indicators................................................................................................................................ 11
6 Connections........................................................................................................................... 12
6.1 Block Diagram ............................................................................................................................... 12
6.2 Power Supply Connection .......................................................................................................... 12
6.2.1 DC Power Connection ........................................................................................................... 12
6.2.2 AC Power Connection............................................................................................................ 12
6.3 Communication Bus Connection.............................................................................................. 13
6.4 Connection of Analog Inputs ..................................................................................................... 13
6.4.1 Connection of Voltage Measurement................................................................................ 13
6.4.2 Connection of Current Measurement............................................................................... 13
6.5 Connection of Digital Output..................................................................................................... 13
6.5.1 PNP Type................................................................................................................................... 13
6.5.2 NPN Type.................................................................................................................................. 14
7 Analog Filtering...................................................................................................................... 15
8 Module Registers.................................................................................................................. 16
8.1 Registered Access......................................................................................................................... 16
8.2 Bit Access........................................................................................................................................ 18
9 Configuration Software ....................................................................................................... 19

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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-1AI1DO module allows voltage or current measurement and has one digital
output. Values are read via the RS485 (Modbus), so it can be easily integrated with
popular PLCs, HMI, or PC equipped with the appropriate adapter.
The device has 1 analog input for voltage measurement and 1 analog input for current
measurement (both inputs can be used at the same time). In addition, the module is
equipped with 1 configurable digital output (PNP or NPN type).
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, all outputs on
and high state on all inputs)
1 W at 24 V DC
2 VA at 24 V AC
Isolation Isolation between power supply and I/O 1000 V DC

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Inputs No. of inputs 2
Absolute maximum input voltage ±60 V
Voltage input impedance 100 k Ω
Voltage measurement accuracy ±0.2%
Voltage input mode
0-10 V
-10-10 V
Max. voltage ±16.386 V
Resolution 1 mV
Voltage input mode
0-1 V
-1-1 V
Max. voltage ±2.048 V
Resolution 1 mV
Absolute maximum input current ±35 mV
Current input impedance 100 Ω
Current measurement accuracy ± 0.1%
Current input mode
0-20 mV
-20-20 mV
Max. current ± 20.048 mV
Resolution 1 µA
Current input mode
4-20 mV
Max. current 20.048 mV
Resolution 1‰
Measurement resolution 16 bits
ADC processing time 70 ms/channel
Digital Outputs Maximum current and voltage 250 mA/50 V
Temperature Work -20 °C to +65°C
Storage -40 °C to +85°C
Connectors Power supply 2 pin
Communication 3 pin
Inputs & Outputs 2 x 3 pin
Configuration mini USB
Size Height 90 mm
Length 56.4 mm
Width 17.5 mm

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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 other devices,
which generate electromagnetic radiation. Relays, contactors, transformers, motor
controllers, 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.
4.5 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
4.6 Configuration Registers
Modbus Address Decimal Address Hex Address Name Values
40002 1 0x01 Address From 0 to 255
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

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Modbus Address Decimal Address Hex Address Name Values
40004 3 0x03 Stop Bits 1 – one stop bit
2 – two stop bits
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
VIN IIN The LED indicates that the signal to input is connected and is different from
0
DO The LED indicates that the output is on
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
6.2.2 AC Power Connection
Figure 5. AC power connection

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6.3 Communication Bus Connection
Figure 6. Communication bus connection
6.4 Connection of Analog Inputs
6.4.1 Connection of Voltage Measurement
Figure 7. Connection of voltage measurement
6.4.2 Connection of Current Measurement
Figure 8. Connection of current measurement
6.5 Connection of Digital Output
6.5.1 PNP Type
Figure 9. Connection of PNP type digital output

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6.5.2 NPN Type
Figure 10. Connection of NPN type digital output

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7 Analog Filtering
If the measured signal is interrupted it is possible to eliminate the disruptions by
switching the lowpass filter on. It is possible to configure the filter for all inputs (it is not
possible to enable the filter for only one input). The filter parameter corresponds to the
filter time constant. Step response of the filter is shown in the graph below.
Figure 11. Analog filtering chart

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8 Module Registers
8.1 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 .ode (ASCII or
RTU)
40010 9 0x09 Filter Read/write Measurement filtering,
value from 1 to 10
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 Connected inputs
Bit in high state →signal is
connected
40052 51 0x33 Outputs Read/write Alarms state
bit no. 3 digital output
30053 52 0x34 Voltage Read Voltage in mV
30054 53 0x35 Current Read Current in μA or ‰
40055 54 0x36 Alarm – Max Voltage Read/write Maximum value of voltage
excess which causes set

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Modbus
Address
Decimal
Address
Hex
Address
Register Name Access Description
bit no 1 in the register
40052
40056 55 0x37 Alarm – Min Voltage Read/write Minimum value of voltage.
If voltage drops below this
voltage bit no 1 in the
register 40052 is set
40057 56 0x38 Alarm – Max Current Read/write Maximum value of current
excess which causes set
bit no 1 in the register
40052
40058 57 0x39 Alarm – Min Current Read/write Minimum value of current.
If current drops below this
voltage bit no 1 in the
register 40052 is set
40059 58 0x3A Voltage Alarm
Configuration
Read/write Alarms configuration
0 – alarms state depends
on actual values
1 – alarms state need to
clear by master
40060 59 0x3B Current Alarm
Configuration
Read/write
40061 60 0x3C Voltage Input
Configuration
Read/write 0 – OFF
1 – 0 .. 10 V
2 – -10 .. 10 V
3 – 0 .. 1 V
4 – -1 .. 1 V
40062 61 0x3D Current Input
Configuration
Read/write 0 – OFF
1 – 0 .. 20 mA (in μA)
2 – 4 .. 20 mA (in ‰)
3 – -20 mA .. 20 mA (in μA)
40063 62 0x3E Digital Output
Configuration
Read/write Digital output
configuration
0 – output controlled by
master
1 – output state depends
on voltage
2 – output state depends
on current
+256 – output set if value
is greater than alarm value
(40065 register) („cooling")
+512 – output set if value
is below than alarm value
(40065 register)
(„warming")
40064 63 0x3F Alarm Value Read/write Alarm value

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Modbus
Address
Decimal
Address
Hex
Address
Register Name Access Description
40065 64 0x40 Alarm Hysteresis Read/write Hysteresis for alarm
Table 7. Registered access
8.2 Bit Access
Modbus
Address
Dec Address Hex
Address
Register Name Access Description
801 800 0x320 Voltage Input Read Voltage input state
802 801 0x321 Current Input Read Current input state
10817 816 0x330 Voltage Alarm Read/write Voltage alarm state
10818 817 0x331 Current Alarm Read/write Current alarm state
10819 818 0x332 Digital Output Read/write Digital Output state
Table 8. Bit access

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9 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 12. PC connection
The SfAR Configurator is a universal software, where it is possible to configure all available
modules.
Figure 13. SfAR Configurator