The Siemens 6ES7922-3BJ01-0AM0 is a pre-assembled front connector MTA (Marshalled Termination Assembly) designed for the SIMATIC S7-300 PCS7 system. It carries a 20-pole front connector on one end and a 25-pole D-SUB socket for ET200M on the other, with an 8 m round cable in between. The cable is rated for 24 V nominal and a maximum of 30 V, with 0.5 mm² conductor cross-section and a 7.6 mm outer diameter PVC sheath.
The 20-pole front connector mates directly with the SIMATIC S7-300 I/O module's 20-pin slot (order code 6ES7392-1AJ00-0AA0). The 25-pole D-SUB on the field side connects to an ET200M remote I/O station. The 8 m cable length is fixed — no field splicing; route it cleanly from the I/O rack to the marshalling cabinet. The 24 V rated value is the signal-level voltage for digital and analog I/O; the 30 V maximum is the absolute limit — don't exceed it even transiently. The cable carries both analog and digital signals, so it's a universal drop for mixed I/O slices. The 0.5 mm² conductor cross-section is adequate for 24 V signal loops up to 8 m; voltage drop is negligible at typical PLC input currents (7–15 mA per channel).
This cable assembly is built for the SIMATIC S7-300 PCS7 MTA (Marshalled Termination Assembly) architecture — a structured cabling approach used in process automation to terminate field wiring in a marshalling cabinet before routing to the I/O rack. It's the physical link between the S7-300 I/O module and the ET200M remote station, carrying both analog and digital signals over a single 20-pole bundle. The screw-type terminal on the enclosure side and connector strip on the field side match standard panel wiring practices.