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UniPi Neuron S103


UniPi Neuron S103 is a universal control unit. It represents a basic model of the UniPi Neuron PLC product range (Programmable Logic Controllers), designed to be used as a central control unit for control, regulation and monitoring of smart building systems, HVAC (Heating, Ventilation, Air Conditioning) systems, industrial automation and others

Package includes:

  • UniPi Neuron S103 control unit
  • Removable screw connectors
  • DIN rail holder(35 mm)
  • Power supply (optional)
  • MicroSD memory card (optional)

Raspberry Pi 3 model B inside. 

SD card
Power Supply

219,00 € - 253,08 €
180,99 € - 209,16 € excl. TAX
More than 20 items in stock



  • 4× Digital inputs 5-24 V DC
  • 4× Transistor outputs max. 750 mA at 50 V DC
  • 1× Analog output 0-10 V
  • 1× Analog input 0-10 V/4-20 mA
  • 1-Wire bus (with galvanic isolation)
  • RS485 (for Modbus communication)
  • RTC (Real Time Clock) with backup for up to 7 days
  • Mervis lifetime license
  • 1 GB RAM
  • 4 × 1.2 GHz CPU
  • 4 × USB
  • 1 × Ethernet 10/100 Mbps
  • DIN rail mounting
  • Anodized aluminum case
  • Power supply 24 V DC required


UniPi Neuron S103 is a universal control unit. It is a basic model of the Neuron modular PLC product range, designed for control and regulation of smart building systems, HVAC systems, industrial automation and others. The unit can also be utilized for energy consumption monitoring, data collection and their cloud storage, or it is possible to use it as a gateway for other devices (boilers, heaters etc.).

The Neuron S103 is the basic model for the whole Neuron line-up. Compared to Neuron M and Neuron L series, the S103 has fewer I/O modules and does not feature relay modules, but at the same time represents the most compact model.

As standard, the unit is equipped with DIN rail mount to attach the unit into distribution box. The required space is 4 DIN modules (1 module = 17.5 mm width).

All Neuron units feature IP20 degree of protection

Standard Neuron model overview

Product DI DO RO AI AO RS485 Common features
Type S, size on DIN rail: 4 modules = 7 cm 1-Wire bus
Ethernet 10/100 Mb
4 × 1.2 GHz CPU
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

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

Thanks to a 1 GB RAM and 1.2 GHz quad-core CPU, the Neuron has a very low response rate (ie. delay between input signal reception and output response) of about 0.5 ms. The Neuron thus offers a professional level of performance in a compact and affordable package, stored in durable aluminium case.

Meet the possibilities

  • 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

The 1-Wire channel supports up to 15 digital thermometers connected.

Inputs & Outputs

Digital inputs (DI)are designed for reading of binary values (0/1, on/off, open/closed etc.) and are thus suitable for connecting switches, motion sensors, window or door magnetic locks etc.

Digital outputs (DO) can be used to control binary state devices, such as lightning switches, window shutters control, remote door control etc.

Analog inputs (AI) are used to receive either 0-10V voltage or 0-20mA current signals. Alternatively, they can be used for reading data from corresponding sensors, such as resistance thermometers. The user can adjust the input mode via corresponding control software.

Analog outputs (AO) are used for control of external devices such as three-way valves or heat exchangers via 0-10V voltage or 0-20mA current signals. Analog outputs allow current or voltage regulation - alternatively, Group 1 inputs can be used in combination with resistance thermal sensors.

Relay outputs (RO) are designed for switching two-state devices via alternating or direct voltage. Relays thus can be used to switch boilers, water heaters, electric motors or other stronger relays. Neuron unit relays are designed for 5A maximum current and 250V alternating/30V direct voltage.

The Neuron is suitable for all systems excluding security systems. These can be integrated by interconnecting the Neuron with security system master control unit via the Modbus interface. The Modbus can be used for control and integration of any device supporting the protocol.


Neuron is CE and EMC tested. According to standard, all UniPi Neuron products 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

See the EU declaration of conformity in product file tab. In accordance with European standards, Neuron is a professional control unit. For the US market, it represents an excellent automation development kit.

Other materials

If you are looking for more information, you may be interested in Neuron series introduction or in its technological introduction. You can also find more information in the enclosed files.


Technological specification of the product
Guide to set up and use this device, technological documentation
Modbus register map
Table overview of Modbus registers
Instruction leaflet
Regulatory Compliance and safety information added to each unit
Declaration of conformity

Weigth 450 g
Dimensions 70 mm × 90 mm × 60 mm
CPU 4 × 1 GHz
Digital inputs 4
Transistor outputs 4
Analog inputs 1
Analog outputs 1
RS485 interface Yes
1-Wire bus Yes (Galvanically isolated)
Ethernet 10/100 BaseT
USB 2.0 4
Power 24 V DC
RTC backup maximum 7 days
Mounting DIN (35 mm)

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