The Siemens 6ES7924-0CH20-0BC0 is a connection module for SIMATIC S7-300 and S7-1500 digital I/O modules. It carries 28 push-in terminals — 8 for I/O, 10 for L+, and 10 for M — all rated at 24 V DC and 1 A per channel, with a total current limit of 4 A. The infeed function is built in, so you can feed the module directly without a separate power connector.
Snaps onto standard 35 mm or 15 mm DIN rail — any mounting position works. The push-in terminals accept stranded wire from 0.2 to 2.5 mm²; a 3.5 mm screwdriver blade is the right tool for release. No end cover plate is needed, and the single-level terminal row sits at the top, leaving the bottom clear for cable routing. Maximum cable length from the front connector to this module is 30 m.