The Siemens 6ES7923-5BC00-0CB0 is a pre-assembled round cable purpose-built for SIMATIC S7-1500 systems, linking the front connector module to the connection module via 50-pin IDC connectors on both ends. It carries 32 channels of digital I/O — the 50 conductors (0.14 mm² each) map to the full channel count plus commons, so a single cable handles an entire 32-channel input or output module without field wiring.
Rated at 24 V with a maximum of 60 V, this cable is sized for the S7-1500's 24 VDC digital I/O bus — the 60 V ceiling covers the module's isolation barrier and any transient peaks on the backplane. The 2 m length is enough to reach from the front connector to a remote connection module inside a standard 800 mm enclosure without excess service loop. The round PVC sheath (10.3 mm OD) and unshielded construction keep it flexible for routing through cable ducts or along DIN-rail troughs. Because it is unshielded, keep it separated from power and drive cables by at least 100 mm to avoid coupled noise on the digital signals.