SfAR-S-8AI2DO User Manual
www.ismacontrolli.com
DMP273en | 3rd Issue rev. 2 | 05/2022
page 6 of 26
3 Module Features
3.1 Purpose and Description of the Module
The SfAR-S-8AI2DO module allows for measuring voltages and currents. Values are read
via RS485 (Modbus), so the module can be easily integrated with popular PLCs, HMI, or
PC equipped with the appropriate adapter.
The device has a set of 8 analog inputs measurements. In addition, the module is
equipped with 2 configurable digital outputs.
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
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.
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)
2.4 W at 24 V DC
3 VA at 24 V AC
Inputs
No. of inputs
8
Absolute maximum input voltage
±30 V
Voltage input impedance
120 kΩ
Voltage measurement accuracy
±0.2 %
Voltage input mode
0-10 V
-10-10 V
Max. voltage
±12.288 V
Resolution
1.5 mV
Voltage input mode
0.1 V
-1.1 V
Max. voltage
±3.072 V
Resolution
1 mV
Absolute maximum input current
±35 mA
Current input impedance
100 Ω
Current measurement accuracy
±0.2 %
