The Siemens 6ES7922-3BJ00-0AT0 is a pre-assembled MTA front connector for the SIMATIC S7-300 PCS7 system — a 40-pole round cable assembly, 8 m long, terminated on one end with a screw-type terminal block that mounts on the enclosure (the field side) and a connector strip that mates to the I/O module backplane. It carries digital signals only (no analog transmission), rated at 24 V nominal with a maximum of 30 V, and uses 0.5 mm² conductors in a black PVC sheath with a 9.8 mm outer diameter.
This cable is purpose-built for the SIMATIC S7-300 PCS7 MTA system — it replaces the field wiring from the I/O module to the terminal block on the enclosure door or panel wall. The 8 m length covers typical cabinet-to-field distances without a junction box. The 40-pole front connector (Siemens order code 6ES7392-1AM00-0AA0) on the module end mates directly to the S7-300 backplane connector; the screw-type terminal strip on the enclosure end accepts field wiring for up to 40 digital I/O points. The 24 V nominal / 30 V maximum rating means each conductor is sized for standard 24 VDC control circuits used across S7-300 digital I/O modules. The 0.5 mm² cross-section carries typical 0.5 A per channel without significant voltage drop over the 8 m run — fine for proximity sensors, limit switches, and relay coils within the same panel. The PVC sheath and round cable design make it suitable for fixed installation in control cabinets with standard cable routing.