SfAR-1M-2DI2DO User Manual
www.ismacontrolli.com
DMP267en | 3rd Issue rev. 1 | 05/2022
page 5 of 17
3 Module Features
3.1 Purpose and Description of the Module
The SfAR-1M-2DI2DO 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 2 digital inputs with configurable timer/counter option, which allows to
connect one 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
2
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.
2
Resolution
32-bit
Frequency
1 kHz (max.)
Impulse width
500 μs (min.)
