What it is and where it fits
The 6ES7923-5BD00-0GB0 is a Siemens pre-assembled round cable purpose-built for the SIMATIC S7-1500 system, connecting the I/O module's X10 or X11 port to a 32-channel connection module. It carries 40 conductors, each 0.14 mm², in a 10.3 mm diameter PVC sheath, terminated at both ends with 40- and 50-pole IDC connectors. Rated for 24 V (maximum 60 V), it is intended for digital signal transmission only — not for analog signals.
Key ratings and what they mean for fit
The 3 m fixed length is the exact span from the S7-1500 I/O module to its connection module — no field cutting or re-termination. The 32-channel count matches the 32 I/O connection modules in the same family, so one cable serves one 32-point block. The 24 V rated value is the nominal signal level for S7-1500 digital inputs and outputs; the 60 V maximum gives headroom for 48 VDC field devices if the module supports them, but the cable itself is not rated for mains voltages.