Purpose and Description of the Module
The SfAR-S-8AO module has a set of 8 analog outputs that can work as current outputs (0-20 mA or 4-20 mA) or as voltage outputs (0-10 V). Setting the output current or voltage mode is done via RS485 (Modbus protocol), so the module can be easily integrated with popular PLCs, HMI, or PC equipped with the appropriate adapter.
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 or set the Modbus address using the DIP switches under the front panel.
10-38 V DC; 10-28 V AC
Power consumption (with active Modbus transmission, all outputs on)
1.25 W at 24 V DC
1.5 VA at 24 V AC
Isolation between power supply and I/O
1000 V DC
No. of outputs
0 V do 10 V (resolution 1.5 mV)
Max. load current 0-10 V 5 mA
0 mA - 20 mA (resolution 5 μA)
4 mA - 20 mA (value in ‰ – 1000 steps) (resolution 16 μA)
Max. resistance 500 ohm
DAC processing time
-10°C to +50°C (14°F to 122°F)
-40°C to +85°C (-40°F to 185°F)
2 x 10 pins
119.1 mm (4.689 in)
110.9 mm (4.366 in)
22.7 mm (0.894 in)
Up to 128 devices
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 IOs are at the bottom and top of the module. USB connector configuration and indicators located on the front of the module.