The Siemens 6ES7142-1BD40-0XB0 is an EM142 expansion module for the ET 200X distributed I/O family, IP66/67 rated. It carries 4 digital outputs at 24 V DC, each rated for 2 A continuous, with electronic short-circuit and wire-break detection per channel. Diagnostics are parameterizable, so you can enable alarms for each output individually. A green status LED per channel gives a quick visual check at the panel.
Output performance and derating
Inductive shutdown is clamped to typ. (2L+) -53 V, which keeps flyback spikes from damaging the output stages. The module also isolates between different circuits at 75 V DC / 60 V AC, and between the backplane bus and all other circuits.