PLC Logic system houses logic in module that plugs directly into block of 8 PLC Relays to create smart relay system. When connected to 8 relays, complete system measures 50 mm wide. Each electromechanical and solid-state relay channel can be configured as input or output, from 16–48 I/O points, with the use of expansion modules. Logic modules have 8 integrated digital inputs, 2 of which can be defined as analog inputs (0–10 V). Hot-swap capability facilitates relay replacement.