PR131 module in DIN rail enclosure, front three-quarter view

16 analogue or digital inputs to Modbus RTU (RS485)

Article number PR131s01

The PR131s01 is the general version of the PR131. The 16 inputs accept analogue signals (0-10 V, 4-20 mA, 0-30 V, resistances and potentiometers) as well as on/off signals from switches and sensors. Supply and RS485 each have two terminal blocks, so several modules can be daisy-chained. The ERR LED signals a communication error and clears automatically once communication is restored.

Supply 10 to 31 V DC
Input 16 inputs: 0-10 V, 4-20 mA, 0-30 V, resistance, potentiometer or on/off signal
Output modbus RTU over RS485, function codes 3 (holding registers) and 4 (input registers); Modbus TCP over Ethernet optional

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Specifications

Specifications
Supply	10 to 31 V DC
Input	16 inputs: 0-10 V, 4-20 mA, 0-30 V, resistance, potentiometer or on/off signal
Output	Modbus RTU over RS485, function codes 3 (holding registers) and 4 (input registers); Modbus TCP over Ethernet optional
Setup	Slave address with two rotary switches (SW1 and SW2)
Protection	Reverse polarity and overvoltage protection on inputs and supply; fuses
Indication	LEDs PWR (power), ACT (communication) and ERR (communication error)
Ambient temperature	0 to 55 °C, non-condensing
Mounting	DIN rail; supply and RS485 can be daisy-chained

Connections

Connections
Terminal	Function
Terminal Power +	Supply plus
Terminal Power E	Earth
Terminal Power -	Supply minus
Terminal Comm A	RS485 A
Terminal Comm B	RS485 B
Terminal Comm 0	RS485 0 V
Terminal IN1 – IN16	Inputs 1 to 16, a plus and a minus terminal per input

Datasheet (PDF)PDF, 117 kB

Setup

Connect the supply, RS485 and the inputs according to the markings on the module.
Set the slave address with the rotary switches SW1 and SW2.
Switch on the supply: PWR lights, ACT shows communication and ERR a communication error.

Application

Reading analogue and digital sensors in industrial automation
Reading switches and sensors in the wheelhouse
Monitoring water quality with 4-20 mA and 0-10 V sensors
Monitoring the status of pumps and valves
Reading CO2, temperature and humidity sensors in buildings

PR131: 16 inputs to Modbus RTU

The PR131 reads 16 inputs and passes the values on via Modbus RTU over RS485 (function codes 3 and 4). The slave address is set with two rotary switches. LEDs show power (PWR), communication (ACT) and errors (ERR). The module is protected against reverse polarity and overvoltage and has fuses. Supply 10 to 31 V DC, ambient temperature 0 to 55 °C, DIN rail mounting. A version with Modbus TCP over Ethernet is optional.

The PR131s01 is the general version for analogue and digital signals: 0-10 V, 4-20 mA, 0-30 V, resistances, potentiometers and contacts. The PR131s02 is set up to read the buttons of manual call points, reporting open circuits and short circuits; it is not a certified part of a fire alarm system.

More about the PR131 series