UniPi Axon L205 is a programmable logic controller (PLC) designed for control, monitoring and regulation. L205's architecture focused on digital inputs and relay outputs, but offers significant increase in I/O number.
The L205 is a basic model of the Axon L. It represents an enlarged variant of the M205 model with a significantly increased number of digital inputs and relay outputs. Digital inputs can be used for reading digital signals from corresponding sensors, relay outputs are then suitable for switching various two-state devices such as boilers, water heaters, circulation pumps or other, stronger relays. That makes the L205 especially suitable for control of intelligent heating, ventilation or air conditioning (HVAC) systems.
|Digital inputs||36||Common features
(1.2GHz quad-core ARM CPU, 1GB RAM)
8GB eMMC onboard memory
2× USB 2.0
1× 1Gbit Ethernet
Extended operating temperature range
Aluminium chassis (IP20)
|RS485 serial interface||2|
|RS232 serial interface||1|
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.
Digital outputs (DI) are intended for switching various binary devices (lighting, smart door locks, drives of shutters and blinds etc.) through direct voltage. DO's also feature a Pulse-Width Modulation (PWM) function allowing to use the output for analogue control.
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.
Analogue input (AI) is designed to measure voltage, current or resistance to read values from various analogue sensors such as thermometers, pressure meters, tensometers etc.
Analogue output (AO) serves for control of multi-state external devices through direct voltage or current and is suitable for control and regulation of devices such as three-way valves, heat exchangers, electric motors etc.
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 then offers better reliability compared to systems relying on microSD memory cards.
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' length 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.). A 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 port for network communication.
Thanks to the software openness of Unipi controllers customers can choose from a broad 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 already existing software solutions, use custom code or to develop applications for the controllers.
All components of the controller are encased within a durable aluminium chassis (IP20 protection). The controller is designed for mounting on a standard DIN rail (35 mm).
|Type S, the size on DIN rail: 4 modules (7 cm)||
Quad-core ARM CPU (1.2 GHz)
|Type M, the size on DIN rail: 8 modules (14 cm)|
|Type L, the size on DIN rail: 12 modules (21 cm)|
1- 2× Ethernet (1 Gbit + 10/100 Mbit)
2 - wireless LTE module
3 - wireless IQRF module
4 - IEC 62386 (DALI-compatible)
Datasheet of the product
Declaration of conformity
Technical and safety information
|CPU||4x 1.2 GHz|
|Internal memory||8GB eMMC|
|1-Wire bus||Yes (galvanically isolated)|
|RTC backup||max. 7 days|
|Dimensions||210 mm x 90 mm x 60 mm|
|Mounting||DIN (35 mm)|