What this module does
The CP1W-SRT21 is a Link Module for CompoBus/S networks — it's not an I/O module, it's the network interface that lets a CP1 or CJ series PLC talk to remote I/O nodes over the CompoBus/S fieldbus. Mounts on DIN rail, terminates via screw terminals.
Compliance and approvals
Carries CE, cULus, Lloyd, and NK approvals. The Lloyd and NK marks indicate marine classification society approval — relevant for shipboard or offshore installations where those certifications are required.