The Siemens 6ES7922-3BD00-0AN0 is a pre-assembled front connector MTA — a cable assembly that bridges the SIMATIC S7-300 I/O module (40-pole front connector 6ES7392-1AM00-0AA0) to a 25-pin D-SUB socket on an ET200M remote I/O station. It is purpose-built for the SIMATIC S7-300 PCS7 MTA target system, carrying 40 digital signal channels on a 3 m round PVC cable with 0.5 mm² conductors.
Rated at 24 V with a maximum of 30 V — this is the signal-level voltage for the digital inputs or outputs on the S7-300 module. The 30 V ceiling means it can handle 24 V nominal circuits with headroom for ripple or transient peaks common on industrial 24 VDC buses, but it is not rated for higher-voltage field wiring. The 3 m cable length is fixed; if your cabinet layout requires a longer or shorter run between the I/O rack and the ET200M interface, this assembly will not stretch — plan the routing accordingly.
The field end terminates in a connector strip (the 40-pole front connector that snaps onto the S7-300 module); the enclosure end uses a screw-type terminal for the 25-pin D-SUB connection. The round cable sheath has an outer diameter of 10.6 mm (bundled single cores) — factor that into cable duct fill or gland-plate sizing if you are running it alongside other cables.