The Siemens 6ES7922-3BC50-5AC0 is a pre-wired front connector for SIMATIC S7-300 digital I/O modules, delivering 40 individually numbered single cores terminated in screw-type terminals at the module end. It mates with the 40-pin front connector receptacle (6ES7392-1AM00-0AA0) and comes as a VPE of 5 units, each with a 2.5 m cable length.
Rated at 24 V with a maximum of 30 V, this connector is designed for the signal-level voltages typical of S7-300 digital I/O — not for power distribution. The 40 poles match the full I/O capacity of a 40-channel module, so one connector handles an entire card's field wiring. Each core is 0.5 mm² H05V-K PVC-insulated, blue sheathed, with a 2.2 mm outer diameter per bundled core. That cross-section suits standard PLC signal loads (sensors, actuators, indicators) but is undersized for any load over about 1 A — stay within the module's output current per channel.
Deployment context
This connector lives inside the control cabinet, wired from the screw terminals on the module face to the terminal blocks or junction boxes in the panel. The 2.5 m length is generous for a standard 800 mm deep enclosure — it reaches from the rack to a nearby DIN-rail terminal strip without a splice. The cores are consecutively numbered 1 to 40 on white adapter contacts, matching the module's channel numbering, which saves time during commissioning and troubleshooting.