Siemens 6ES7 142-1BD40-0XA0 Digital Output Module

Siemens 6ES7 142-1BD40-0XA0 is an ET 200X digital output expansion module (EM142) for the SIMATIC S7 distributed I/O system. It adds four 24 V DC output channels, each rated up to 2 A, enabling direct control of small relays, indicators, or other 24 V DC loads from an ET 200X module. The DO4 expansion connects to the ET 200X backplane via a 5-pin M12 interface and is designed to be used as part of the EM142 family to extend digital outputs in automation projects. The module supports compact installation in industrial environments and is compatible with the SIMATIC S7 architecture, allowing centralized wiring and scalable I/O distribution across a production line. Typical use cases include distributing actuation and signaling across multiple machines or panels where four additional DC outputs are needed without enlarging the main PLC I/O, providing a straightforward, plug‑in method to enhance control capabilities in a Siemens automation setup.