Backplane communications module for CS1/CJ1 racks
The Omron CS1W-CORT21 is a Communications Module that mounts into a CS1 or CJ1 series PLC backplane, adding a dedicated serial or protocol interface without consuming a CPU slot. It carries CE, CSA, and UL approvals, so it passes panel-level certification for machinery shipped into North American and European markets. Rated for 0°C to 55°C ambient — the cabinet ventilation must keep the interior below that ceiling, typical for a sealed IP54 enclosure with a fan or heat exchanger.
Lifecycle — last-time-buy window open
The CS1W-CORT21 is flagged eol_hot — the manufacturer has issued end-of-life notice, meaning the last-time-buy window is active and the part will not be restocked once current inventory clears. For a BOM that requires this exact module, secure the quantity now through the remaining supply channel; once exhausted, the only path is surplus or a system migration to a newer Omron communications platform.
Field wiring and integration
Termination is screw terminal — field wiring lands directly on the module without a separate breakout board, saving a DIN-rail position. The module includes a display for local status indication, useful during commissioning to confirm link state without a programming laptop.