What this cable does in your panel
The Siemens 6ES7923-5BB50-0EB0 is a pre-assembled round cable that connects a 4×16-pole front connector module on a SIMATIC S7-300 or S7-1500 digital I/O module to a 1×50-pole connection module. It uses IDC connectors at both ends — no field wiring, no screw terminals, just a straight push-on fit. The 1.5 m length is enough to route from the module face to a breakout or marshalling cabinet without excess coil. Rated at 24 V with a maximum of 60 V, this cable is sized for the standard PLC control voltage. The 50 conductors, each 0.14 mm², carry 32 digital I/O channels plus commons — enough for a full 32-channel input or output card.
Where it fits
This cable is specific to the SIMATIC S7-300 and S7-1500 families. The 1st interface is a 16-pole connector that mates with the cable-side front connector module on the I/O module; the 2nd interface is a 50-pole connector for the connection module. It is unshielded and transmits digital signals only — not for analog or fieldbus links. The round cable has a PVC sheath, 10.3 mm outer diameter, and is black. It operates from 0 to 60 °C and stores from -30 to +70 °C. The IDC connectors require no special tooling beyond a standard IDC press.