The Siemens 6ES7923-2CD00-0AA0 is a round-sheath ribbon cable purpose-built for wiring digital I/O modules in SIMATIC S7-300 and S7-1500 systems. It carries 32 conductors arranged as 2×16 cores, each 0.14 mm², unshielded, in a black PVC sheath with an outer diameter of 11.5 mm. The full 30 m length ships as a single piece, pre-terminated or field-cut depending on the connector variant you pair it with. Rated for 24 V nominal with a maximum working voltage of 60 V, this cable handles the signal levels typical of 24 VDC digital input and output cards. The coded-wire core marking simplifies identification during panel wiring — no need to ring out each conductor against a schematic.
The 30 m length is the critical fit parameter for most installations — it dictates whether the cable reaches from the I/O module rack to the field termination cabinet without a splice. The 0.14 mm² conductor cross-section is sized for signal-level currents (typical digital input sink/source under 10 mA per channel), not power delivery. The PVC sheath gives adequate mechanical protection for fixed installation inside enclosures or cable ducts; it is not rated for continuous flexing or drag-chain use. Operating temperature range of 0 to 60 °C and storage range of -30 to +70 °C cover standard industrial control cabinet conditions. The round-sheath construction (as opposed to flat ribbon) makes it easier to route through cable glands and along DIN-rail troughs without kinking.