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UniPi Neuron L513


UniPi Neuron L513 is a programmable logic controller (PLC) designed for control, monitoring and regulation. The L513  is based on the L503 model, but features additional analog I/Os for the total of 9x AI/9x AO. It is also equipped with a third RS485 serial line 


  • universal architecture with a very high number of I/Os
  • highest number of analog I/Os, three RS485 lines
  • durable aluminium chassis (IP20 protection)
  • integrated Raspberry Pi Model 3B computer (quad-core CPU, 1 GB RAM)
  • designed for DIN rail mounting
  • features RS485 serial line for Modbus communication
  • software openness (based on Linux OS)
  • Mervis lifetime license as part of the package

SD card
Power Supply

599,00 € - 675,48 €
495,04 € - 558,25 € excl. TAX
More than 20 items in stock



The L513 is a largest model of the Neuron 500 line (consisting of the L513, M503 and L503 models). As the rest of the 500 line, it features multiple analog I/O modules and additional RS485 serial line while retaining a set of digital inputs and relay outputs. When compared to the M503 and the L503, the L513 however features additional 4 analog I/O modules and a third RS485 universal bus port. That makes the L513 a best choice for large projects requiring a control and regulation of larger number of external devices such as three-way valves or heat exchangers. 

Inputs & Outputs

16 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)

4 digital outputs (DO) are used for controlling two-state devices such as lights, door locks, window blinds etc. Digital outputs on our controllers also feature the PWM (Pulse-width modulation) function, enabling a special type of analogue control. Outputs are of the NPN type (open collector) and can control devices with voltage up to 50V and up to 750mA load current.

10 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.

9 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 L503 is provided with two types of analogue inputs. Group 1 analogue input (AI1.1) cannot be used for reading data from resistance sensors, it can be however used for voltage or current measurement based on AI register settings. Group 2 (AI/AIS2.1-AI/AIS2.4) and Group 3 (AI/AIS3.1-3.4 allows the user to measure 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.

9 analogue outputs (AO) are used to control various external devices such as three-way valves, heat exchanger or electric motors. Group 1 output (AO1.1) can be used to generate 0-10V DC voltage, 0-20mA direct current or to measure resistance (0-2kΩ, Ni1000 or Pt1000). Group 2 (AOV2.1 - AOV2.4) and group 3 (AOV3.1-AOV3.4) feature 0-10V DC voltage only.

More detailed info about I/O usage and settings can be found in Neuron technical documentation (see Files tab above)

Communication interfaces

L513 features three RS485 serial lines for communication with external devices or connection of extension modules, most often through the Modbus RTU protocol. Serial lines can be used for communication with a wide variety of devices such as energy meters, touchscreen HMI panels, PLCs from other vendors or Neuron xS series extension modules) using the Modbus RTU protocol. A single RS485 can communicate with up to 32 devices with its total length being up to several hundred meters. Lines can be also used as an RS485 gateway for other devices or systems,.

Included is also a single 10/100MBit Ethernet port for network communication and a single 1-Wire bus for connection of various 1-Wire sensors (such as digital thermometers). The 1-Wire bus uses 2 or 3 conductors for communication with simple sensors such as thermometers, humidity meters or light intensity meters. A single bus can communicate with up to 15 sensors with maximum total length of the bus up to 100 meters.

Software options

Customers can choose from a wide variety of software solutions thanks to the open nature of Neuron controllers, and are not limited to a single platform. Available are both professional and open-source solutions.

Our main supported solution for UniPi controllers is the MervisThis platform is developed in accordance with IEC 61131-3 PLC programming standard and contaiíns SCADA interface for remote management and monitoring, comprehensible development enviroment, user interface (HMI) editor and online/on-premise database for data archivation and retrospective operation analysis of monitored technologies. 

Neuron controllers are also compatible with the CODESYS professional platform. designed specifically for use in modern industrial automation. At the same time, the platform is made to be as user-friendly and easy to use as possible. CODESYS is in widespread use around the globe with more than 100 000 users from various countries and more than 1000 companies.

Aside from commercial platforms, several open-source solutions are available as well. Alternatively, customers can use their own code or implement Neurons into already existing software solutions through the use of EVOK open-source API.

Visit this link for supported software overview. 

Other features

All UniPi controllers are able to measure resistance through analog I/Os. Resistance can be measured by either 2-wire or 3-wire method for increased accuracy. Each controller can measure resistance of up to 2kΩ, with some models being able to resistance measure up to 100kΩ. Detailed info about this functionality can be found in Neuron technical documentation. 

All components are encased within a durable anodized aluminium case providing IP20 cover. The unit's size is 12 DIN modules, DIN rail holder is included in the package. 

Package contents

  • controller
  • pluggable screw terminals
  • DIN rail holder (35 mm)
  • DIN rail holder screws
  • microSD card (optional)
  • +24V DC power supply (optional
  • Mervis lifetime license

Possible uses

  • Lightning control
  • Boiler control
  • Temperature measurement
  • Remote home control
  • Remote shutter control
  • Notification sending
  • Energy monitoring
  • Gateway for other systems
  • Irrigation systems
  • Building management systems
  • HVAC control and regulation
  • SCADA systems


Neuron is CE and EMC tested and is compliant with all corresponding European PLC standards. In accordance with these standards Neuron can be used in: 

  • Residential buildings, apartments
  • Commercial areas, offices, banks
  • Entertainment areas, cinemas, bars, pubs, dance clubs
  • Outdoor places, gas stations, parking lots, sport centers
  • Areas of light industry, workshops, laboratories, service centers

The EU declaration of conformity can be found in the Files tab (see above). 

Standard Neuron model overview

Model DI DO RO AI AO RS485 Common features
Type S (size on DIN rail: 4 modules = 7 cm)

Quad-core CPU, 1 GB RAM
1-Wire bus (up to 15 sensors per channel)
10/100Mbit Ethernet
Wi-Fi, Bluetooth, HDMI
4× USB 2.0

S103 4 4 - 1 1 1
S103-G* 4 4 - 1 1 1
S103-IQRF** 4 4 - 1 1 1
Type M (size on DIN rail: 8 modules = 14 cm)
M103 12 4 8 1 1 1
M203 20 4 14 1 1 1
M303 34 4 - 1 1 1
M403 4 4 28 1 1 1
M503 10 4 5 5 5 2
Type L (size on DIN rail: 12 modules = 21 cm)
L203 36 4 28 1 1 1
L303 64 4 - 1 1 1
L403 4 4 56 1 1 1
L503 24 4 19 5 5 2
L513 16 4 10 9 9 3

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 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

* features an integrated wireless GPRS module.
** features an integrated TR-76D smart IQRF transciever

Further info


Modbus register map
Table overview of Modbus registers
Declaration of conformity
Datasheet of the product
User manual
User manual and technical documentation
Instruction leaflet
Technical and safety information

CPU 4 × 1 GHz
USB 2.0 4
Ethernet 10/100 BaseT
Transistor outputs 4
Analog inputs 5
Digital inputs 24
Analog outputs 5
RS485 interface 2 ×
Power 24 V DC
Relay outputs 14
1-Wire bus Yes (galvanically isolated)
Dimensions 210 mm × 90 mm × 60 mm
Mounting DIN (35 mm)
Weigth 1000 g
RTC backup maximálně 7 dní
Parameter 1 GB
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