The Siemens 6ES7923-0CB00-0CB0 is a pre-assembled round cable purpose-built for wiring SIMATIC S7-300 and S7-1500 digital I/O modules. It connects a 16-pin front connector module to a 16-pin connection module via IDC connectors on both ends, with a 10 m cable run. The 0.14 mm² conductor cross-section and 16 conductors match the standard 16-pole interface on S7-300/1500 front connectors, so it drops straight into a panel that already uses that footprint — no rewiring at the module end.
Rated for 24 V nominal operation with a maximum of 60 V, this cable handles the signal levels on S7-300/1500 digital input and output cards — 24 VDC sink/source field wiring is the standard here. The 8-channel modules common in that platform map cleanly across the 16 conductors (one return per channel pair). The unshielded PVC jacket (6.5 mm outer diameter) is fine for digital signals inside a steel enclosure; keep it separated from power cabling if you're running longer parallel runs. Storage range of -30 to +70 °C and operating range of 0 to 60 °C cover typical panel conditions.