Module Features

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.

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
	Voltage input mode 0-10 V -10-10 V	Resolution	1.5 mV
	Voltage input mode 0.1 V -1.1 V	Max. voltage	±3.072 V
	Voltage input mode 0.1 V -1.1 V	Resolution	1 mV
	Absolute maximum input current		±35 mA
	Current input impedance		100 Ω
	Current measurement accuracy		±0.2 %
	Current input mode 0-20 mA -20-20 mA	Max. current	±30.72 mA
	Current input mode 0-20 mA -20-20 mA	Resolution	3.75 μA
	Current input mode 4-20 mA	Max. current	20 mA
	Current input mode 4-20 mA	Resolution	1 ‰
	ADC processing time		16 ms/channel
	Isolation		1000 V DC
Digital Outputs	Maximum current and voltage		500 mA/55 V
Digital Outputs	Isolation		1000 V DC
Temperature	Work		-10°C to +50°C (14°F to 122°F)
Temperature	Storage		-40°C to +85°C (-40°F to 185°F)
Connectors	Power Supply		2 pin
	Communication		3 pin
	Inputs & outputs		2 x 10 pin
	Quick connector		IDC10
	Configuration		mini USB
Size	Height		119.1 mm (4.689 in)
	Length		110.9 mm (4.366 in)
	Width		22.7 mm (0.894 in)
Interface	RS485		Up to 128 devices

Technical specification

Dimensions

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 I/Os are at the bottom and top of the module. USB connector configuration and indicators are located on the front of the module.

Dimensions