What the CS1W-OD231 does in a CS-series rack
The Omron CS1W-OD231 is an output module built for the CS Series PLC backplane. It provides 32 solid-state outputs switched through a rectangular connector, suited for high-speed or inductive loads where relay life would be a constraint. The module mounts on the CPU rack or an expansion backplane, drawing its power from the backplane bus.
How it compares to the CS1W-OD232
The closest functional relative is the CS1W-OD232 — same 32 solid-state outputs, same backplane footprint, same rectangular connector. The difference is in the approval set: the OD231 carries CE, cULus, Lloyd, and NK; the OD232 carries CE, CSA, Lloyd, NK, and UL. For a panel already specified with the OD231, the OD232 will physically drop in and the output count matches, but the cULus versus CSA/UL distinction may matter if the panel certification requires a specific listing mark. No rewiring is needed — the connector pinout is identical across the CS1W output range.
Mounting and compliance note
Backplane mounting means the module seats into a slot on the CS1 rack; no DIN-rail or separate panel cutout required. The rectangular connector mates with the standard CS1W cable or termination unit. Approvals cover CE for European machinery, cULus for North American installations, and Lloyd/NK for marine applications — so this module is already listed for shipboard and offshore panel builds.