The Siemens 6ES7922-3BJ00-0AU0 is a pre-assembled front connector MTA — a factory-terminated cable assembly that bridges the SIMATIC S7-300 I/O module to the ET200M distributed I/O station via a 50-pin D-sub. It is built for the PCS7 process control variant of the S7-300 family, meaning it carries the signal integrity and labeling conventions that process-plant integrators expect. The assembly carries 20 poles on the front-connector side, wired with 0.5 mm² conductors inside a 10.6 mm black PVC round cable. Rated for 24 V with a maximum of 30 V, it handles the analog signal paths typical of PCS7 analog input modules — not digital signals, which this assembly is explicitly not rated for.
The 8 m cable length is the deciding dimension for most BOM checks — it reaches from a standard S7-300 rack to the ET200M interface without a junction box. The 20-pole front connector mates with the 6ES7392-1AJ00-0AA0 connector, so if your panel already uses that Siemens order code, this assembly drops in. The screw-type terminal on the enclosure side and the connector-strip field end match the termination style of the PCS7 MTA termination boards. Because this assembly carries analog signals only, it avoids the cross-talk and shielding concerns that a mixed digital/analog cable would introduce. The 0.5 mm² cross-section is sized for the mA-level loops typical of 4-20 mA transmitters — adequate for signal integrity over 8 m without excessive voltage drop.