The Omron CS1W-AT131 is a terminal block conversion unit that adapts wiring from CS1 Series I/O modules to a different terminal arrangement. Active per the current lifecycle status, so it's still on the production list — no chasing last-time-buy yet.
It's a bulk-packaged adapter designed to sit between the CS1 backplane and field wiring. No firmware, no configuration — just mechanical conversion. Terminal spacing matches the existing CS1 footprint, so swapping an AT111 or AT113 for this unit doesn't require drilling or relocating the rail.
Listed as active. The eol_hot flag in the spec suggests an eventual phase-out, but no official end-of-life notice has been published yet. For a BOM freeze, you're safe for the current production run; if you're planning a multi-year line, it's worth keeping an eye on Omron's PCN feed.