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Sku: S205
Product type: PLC
Manufacturer: Unipi Technology





The UniPi Axon S205 is a programmable logic controller (PLC) designed for control, monitoring and management. The S205 has I / O architecture combining digital inputs and relay outputs for a total number of 16 I / O.

UniPi Axon S205

  • combines digital inputs and relay outputs
  • 16 I / Os and 2 serial lines in a 4 DIN package
  • serial line RS485 + 1-Wire bus
  • cDurable aluminum hassi (IP20 protection), wider operating temperature range
  • integrated industrial computer (quad-core CPU, 1 GB RAM)
  • 8GB integrated eMMC memory
  • designed for DIN rail mounting
  • management software (based on Linux OS)
  • Mervis software preinstalled (can be updated again)

Product description

The architecture of the UniPi Axon S205 model is focused on a higher number of digital inputs and relay outputs. Thanks to 8 digital inputs and 8 relay outputs, the S205 can offer an I / O number comparable with larger units while retaining its compact size. That makes the S205 especially suitable for smaller automation tasks.

basic features

digital inputs 8 common features
industrial computer
(1.2GHz quad-core ARM CPU, 1GB RAM)
8GB eMMC onboard memory
2 × USB 2.0
1 × 1Gbit Ethernet
Wi-Fi, Bluetooth
Extended operating temperature range
Aluminum chassis (IP20)
relay outputs 8
RS485 serial interface 1
RS232 serial interface -
1-Wire bus 1
Ethernet 1

Inputs & outputs description

Digital Inputs (DI) are designed to read binary logic states represented by direct voltage levels. That makes them suitable for reading data from various binary sensors and devices such as switches (on / off), motion sensors (movement detected / not detected), liquid level sensors (full tank / empty tank) etc. 

Relay outputs (RO) are primarily used for switching two-state devices with higher current draw such as lightbulbs, thermoelectric valve drives, water heaters, pumps, etc.

computing module

As a computing module, the Axon controllers use an industrial computer featuring a quad-core 1.2GHz Alwinner H5 CPU and 1GB RAM giving Axons an excellent performance. The 8GB onboard eMMC memory offers better reliability compared to systems relying on microSD memory cards. 

Communication interfaces

Axon controllers are by default provided with RS485 serial lines. This type of interface usually uses the Modbus RTU protocol and can be used to communicate with various devices such as Extension xS extension modules, energy meters, touchscreen HMI displays, controllers from other vendors, various sensors etc. A single bus can support dozens of devices while the bus can reach up to several hundred meters.

Selected models also feature a single RS232 serial line. In the field of automation, this interface is usually used for communication with various converters, closed-in technologies, or display devices such as HMI panels. 

A single 1-Wire bus is also featured on selected models. This interface uses 2-3 conductors for collecting data from various 1-Wire sensors such as thermometers, humidity meters, light intensity sensors etc.). The single 1-Wire bus supports up to 15 devices, the overall length of the bus can reach up to 100 meters. 

All Axon models also feature a single 1Gbit Ethernet byt for network communication. 

software options

Thanks to the openness software of Unipi controllers customers can choose from a wide range of software solutions and are not limited to a single proprietary platform. Among supported solutions are both commercial and open-source systems. 

The main supported platform for Unipi controllers is the Mervis control system. This platform is developed under the IEC 61131-3 PLC programming standard and consists of comprehensible and user-friendly Mervis IDE development environment, an HMI editor for creating and editing of user interfaces, SCADA interface and an online / on-premise cloud database for long -term collecting of operational data and their analysis. Axon-line controllers are shipped with the Mervis already installed. 

Aside from commercial platforms (such as CODESYS), customers can also choose from a variety of open-source solutions; for the supported software overview please visit this link.

Alternatively, customers can use the Unipi-developed EVOK open-source API to integrate Unipi controllers into existing software solutions, use custom code or to develop applications for the controllers.

Other features

All components of the controller are encased within a durable aluminum chassis (IP20 protection). The controller is designed for mounting on a standard DIN rail (35 mm). 

Technical details
CPU 4x 1.2 GHz
internal memory 8GB eMMC
USB 2.0 2
digital inputs 8
Ethernet 1 Gbit
relay outputs 8
Power 24V DC
Dimensions 70 mm x 90 mm x 60 mm
RS485 interface 1
1-Wire bus Yes (galvanically isolated)
Weigth 400 g
Backup RTC max 7 days
Mounting DIN (35mm)
  • the controller
  • removable screw terminals
  • DIN rail holder (35mm)
  • 2 × DIN rail holder mounting screws
  • 1 × grounding screw
  • instruction leaflet
  • lifetime Mervis license code

Normal Delivery | 3 to 5 working days

Urgent Delivery | 1-2 business days

* unless out of stock

We work hard to meet the announced delivery deadlines. However, we face a global shortage for some components and manufacturers.
If you have any questions or concerns, please contact us to ensure delivery time.
We will be able to advise on the availability of alternative hardware and provide recommendations on available components for faster shipping options.