Module Features

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.

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
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
	Voltage input mode 0-1 V -1-1 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
	Current input mode 0-20 mV -20-20 mV	Resolution	1 µA
	Current input mode 4-20 mV	Max. current	20.048 mV
	Current input mode 4-20 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
Temperature	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
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.

Dimensions