The Siemens 6ES7922-3BD00-0AS0 is a pre-assembled front connector MTA (Marshalling Termination Assembly) cable designed specifically for the SIMATIC S7-300 PCS7 MTA target system. It bridges the 40-pole front connector on an S7-300 I/O module to a 50-pole D-sub socket on an ET 200M remote I/O station, using a 3 m round PVC cable with 0.5 mm² conductors. Rated for 24 V and carrying a maximum voltage of 30 V, this cable handles both analog and digital signal transmission — a common requirement in process I/O marshalling where mixed-signal loops run through the same trunk. The 40 channels match the full complement of a standard S7-300 40-pin front connector (order code 6ES7392-1AM00-0AA0).
Connector Configuration and Deployment Context
The field end terminates in a connector strip, while the enclosure end uses a screw-type terminal. This split means the cable lands on a fixed terminal block inside the cabinet (screw-down for vibration resistance) and plugs into the I/O module via the strip — no loose wiring at the module face. The 3 m length is typical for routing from a cabinet-mounted ET 200M to a nearby S7-300 rack or marshalling panel. The cable sheath is black PVC with a bundled-single-core outer diameter of 9.8 mm. Conductor cross-section is 0.5 mm² (roughly 20 AWG), adequate for 24 V signal-level currents in a control cabinet environment.