The Siemens 6ES7924-0BD20-0BC0 is a connection module for the SIMATIC S7-300 target system, designed for digital output signals via 8 relay outputs with single-pole normally-open contacts. Rated at 24 V DC and 1 A, it handles the typical 24 V control circuit loads found in PLC output cabinets — solenoids, contactor coils, indicator lamps — without needing an interposing relay for most applications.
Push-in terminals accept stranded wire from 0.2 to 2.5 mm², and the terminal arrangement is 20 positions total: 8 x 2 for the relay outputs, plus 2 x L+ and 2 x M for the supply infeed. Maximum cable length between the front connector module and this connection module is 30 m, so keep the remote I/O drop within that run to avoid voltage drop issues on the 24 V DC loop. A 3.5 mm screwdriver blade is specified for the push-in release; no end cover plate is required, and the infeed function is built in — meaning you can daisy-chain the supply without an extra terminal block.
Environmental limits and lifecycle
Operating temperature range is 0 to 60 °C with storage from -40 to 70 °C, pollution degree 2 and overvoltage category II — standard for clean, dry control-room environments. No PE connection, no shield connection, and no disconnector on this module — it's a straight pass-through for relay output signals, not a field-side isolation point.