Synergy Logic SLM-RP4: a $249 DIN-rail PLC built on a Raspberry Pi 4, with up to 128 I/O points and OpenPLC
A Raspberry Pi in a DIN-rail case is nothing new, but this one comes with a full set of plug-in I/O modules. On 27 October 2026 CNX Software described the Synergy Logic SLM-RP4, an industrial controller (PLC) built around a Raspberry Pi 4 Model B. It costs $249, with I/O modules sold separately.