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UniPi Extension xS50


UniPi Extension xS50 is an extension module for UniPi Neuron and UniPi Axon programmable logic controllers. The module allows for a quick extension of automation networks by additional I/Os. The xS50 is the most versatile module of the xS line, combining digital inputs, relay outputs and analogue I/Os.

The module does not contain a computing module

Power Supply

239,00 € - 267,10 €
197,52 € - 220,74 € excl. TAX
More than 20 items in stock



The UniPi Extension line of extension modules was designed as a quick and inexpensive way to extend the automation network by additional inputs/outputs without the need to purchase another PLC. Modules are not equipped with a computing module, which is replaced by an additional I/O board. Computing module is represented by a master PLC to which the module is connected via RS485 serial interface.

The xS50 is a universal module featuring a combination of digital inputs, relay outputs and a set of multiple analogue I/Os. Analogue inputs can be used to read voltage, current or resistance to collect data from various analogue sensors (thermometers, pressure meters, tensometers etc.). Analogue outputs are suitable for controlling multi-state devices (electric motors, three-way valves, heat exchangers) via 0-10V DC voltage.

Inputs & Outputs

6 digital inputs (DI) are designed for reading logical states (true or false), which are represented by levels of DC voltage. That makes them suitable for reading two-state sensors such as switches (on/off), movement sensors (movement/no movement), water level sensors (water present, no water) etc. The software detects logical 1 (true) if the input voltage between given DIx.y and DIGND is between 5-30V. If the voltage is lower than 3.5V, the state is evaluated as 0 (false)

5 relay outputs are used for control or switching of devices with higher current loads. ROs are thus suitable for controlling light bulbs, thermoelectric valve drives, water heaters, pumps etc. Relay outputs on UniPi controllers are rated for 5A max. current at 230V AC/30V DC voltage.

4 analogue inputs (AI) can be used for 0-10V DC voltage or 0-20mA current measuring, making them suitable for reading values from analogue sensors such as temperature sensors, pressure meters, tensometers etc. The xS50's inputs allow the user to perform a precise measurement of voltage, current or resistance based on current output register settings.

  • voltage measurement 0-10 V (16bit resolution)
  • voltage measurement 0-2.5 V (24bit resolution)
  • current measurement 0-20 mA (16bit resolution)
  • resistance measurement (from PT100, PT1000 or NTC sensors) using three-wire (three conductors, 0-100 Ω, 24bit resolution) or two-wire (two conductors, 0-1960 Ω, 24bit resolution) wiring method.

4 analogue outputs (AO) feature 0-10V DC voltage for control of devices with analogue input, such as three-way valves, lighting dimmers etc.

Communication interface

Extension modules communicate through the RS485 interface (Modbus protocol). Connection manual for extension modules can be found on this link

Additional functionality

Along with standard I/O functionality, the module offers several functions to enhance the module's performance and to allow it to react to critical events.

Digital inputs feature Direct Switch functions allowing for connecting digital inputs with relay outputs. Direct Switch can be configured for one of three modes: Copy (switching output by active input), Invert (output is switched by inactive input) and Toggle (output is switched by each input change). Direct Switch is independent of the control software and is thus suitable for applications demanding a lowest possible response time (such as lighting control).

The default setting is a function allowing each processor to save its default configuration. This configuration is loaded after every device reboot triggered either by a manual restart or by a power outage.

MasterWatchdog feature monitors the communication between CPU and I/O board processors. If no exchange occurs within a pre-set timeframe, the MasterWatchdog automatically resets the device and me/O modules back into default settings.

I/O boards of the module feature their control processor, which retains the basic I/O functionality in the case of PLC downtime or connection failure.

Device addressing and the DIP switch settings

Addressing the extension module can be done either via control software running on the remote master control unit or can be set manually via the integrated DIP switch. The DIP switch allows the user to set up to 4 bits of address and is evaluated in preference to software settings. If the address on DIP switch is set to “0000”, all DIP switch settings are ignored and the software settings take priority.

Package contents

  • Unipi Extension xS50 extension module
  • pluggable screw terminals
  • DIN rail holder
  • power supply (optional)

Unipi Extension model overview

Product DI DO RO AI AO RS485 Common features
Extension modules, size on DIN rail: 4 modules = 7 cm
xS10 16   8     1

Extension modules communicate over Modbus. It is possible to connect them to the control unit via an RS485 interface. Extension modules are compatible with any control unit with the RS485 interface and Modbus support.

xS30 24         1
xS40 8   14     1
xS50 6   5 4 4 1

*Has integrated wireless GPRS module.
**Has integrated TR-76D smart IQRF transceiver


Datasheet of the product
Declaration of conformity
User manual
User manual and technical documentation
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