A compact edge controller combines open-source PLC programming, industrial certification, and expandable I/O to simplify automation system development for machine builders and system integrators.
Industrial automation developers can use a pre-programmed edge controller to implement programmable logic controller (PLC) functions without building a control system around a bare single-board computer. The SLM-RP4 industrial controller from Synergy Logic combines the Raspberry Pi 4 platform with OpenPLC software and UL listing, targeting industrial and commercial applications that require flexible, connected control.
The controller comes pre-programmed with OpenPLC, allowing users to develop control logic based on the IEC 61131-3 standard. Its UL listing enables integration into UL-listed control panels, helping panel builders address certification requirements when designing industrial control equipment. The controller is intended for original equipment manufacturers (OEMs), system integrators, and end users seeking an open computing platform for automation applications.
The SLM-RP4 supports up to eight external expansion modules, providing a maximum of 128 input/output (I/O) points. This allows developers to configure the controller according to the signals and interfaces required by individual machines or automation systems.
Synergy Logic offers 18 compatible modules covering analogue, digital, relay, simulation, and mixed I/O requirements. Analogue options support voltage and current signals, while dedicated thermocouple modules enable temperature measurement. These options allow the controller to interface with different industrial sensors, actuators, and process equipment without requiring every application to use the same I/O configuration.
The key features are:
- Based on the Raspberry Pi 4 computing platform.
- Approved for the Powered by Raspberry Pi programme.
- Supports up to 128 I/O points.
- Offers 18 compatible expansion module types.
- Uses an external 24V Class 2 power supply.
For example, voltage and current input modules can connect process sensors to monitoring and control systems, while analogue output modules can provide control signals to compatible equipment. Thermocouple inputs can support temperature-monitoring applications, and relay or digital I/O can be used for switching and equipment-status signals. Such configurations can serve machine control, process automation, and industrial Internet of Things (IIoT) projects that combine local control with connected monitoring.
The SLM-RP4 operates across a temperature range of 0°C to 50°C and uses an external 24V Class 2 power supply. These specifications target typical industrial and commercial environments.
By combining Raspberry Pi-based computing, OpenPLC programming, and modular I/O expansion, the controller offers developers a configurable platform for building automation systems. Its pre-programmed software reduces initial setup work, while its expansion options allow control and signal interfaces to be selected according to application requirements.
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