What this module does in the ET 200X slice
The Siemens 6ES7142-1BF30-0XA0 is an EM 142 expansion module for the ET 200X distributed I/O system, delivering 8 digital outputs at 24 V DC with a rated signal current of 1.2 A per channel. It is designated as a spare part, meaning it is not in current-series production but remains available through independent distribution channels for installed-base support. Each output is electronically short-circuit protected, with a typical response threshold of 1.8 A, and the module provides a status indicator (green LED) per channel for on-site fault isolation.
Output ratings and derating in the panel
The 8 outputs are rated 1.2 A per channel at 24 V DC, with a permissible range from 5 mA to 1.3 A. The total current from the load voltage 2L+ is limited to 7 A at ambient temperatures up to 20 °C, derating to 5 A at 55 °C — so a full 8-channel load at 1.2 A each (9.6 A total) exceeds the module's thermal budget and requires grouping or derating per the installation guidelines. Switching frequency with resistive load reaches 100 Hz; with lamp load it drops to 1 Hz, which governs the choice of downstream contactor or solenoid. The inductive shutdown voltage is clamped to typ. (2L+) -47 V, protecting the output stage from flyback spikes.
Physical fit and environmental sealing
Unshielded cable runs up to 30 m are permitted per channel. Isolation between the backplane bus and all other circuit components is tested at 500 V DC, with channel-to-channel isolation not provided — adjacent outputs share a common group.