What It Is and Where It Fits
The Siemens 6ES7924-2CA20-0BA0 is a connection module for the SIMATIC S7-1500 system, specifically designed for use with digital I/O modules. It provides the physical termination point for field wiring, routing signals between the I/O modules and the process. The module is rated for 1 A at 24 V DC, with a total maximum current of 2 A, which means it handles the signal-level power for a bank of digital inputs or outputs without needing an external distribution block for the module supply.
Integration and Mounting
This module mounts on 35 mm or 15 mm DIN rail, fitting into the standard S7-1500 enclosure layout. Its dimensions — 175 mm wide, 76 mm high, 60 mm deep — occupy a single slot width in the rack. The connection terminals are at the top, with a single terminal level, using screw-type terminals that accept stranded wire from 0.5 to 2.5 mm². A 3.5 mm screwdriver blade is specified for termination. The module includes an infeed function, meaning it can distribute the 24 V DC supply to the connected I/O modules, simplifying the backplane wiring.
Terminal Configuration and Wiring
The module provides 98 terminals: 32 for I/O signals, 33 for L+ (24 V DC), and 33 for M (ground). This arrangement allows for a clean, organized wiring scheme where each signal and its corresponding supply and return are terminated at the same module. The maximum wire length between this connection module and the front connector module is 30 m, which is ample for most cabinet layouts. There is no shield connection on this module, so field wiring shields must be grounded at the sensor or at a separate grounding bar. The module is not cross-connectable and does not include a disconnector or PE connection.