The 6ES7142-1BD40-0XA0 is a SIMATIC DP Extended Module EM 142 for the ET 200X family — a spare-part designation for a 4-output digital slice that switches 2 A per channel at 24 V DC through a 5-pole M12 connector, sealed to IP65. It's built for distributed I/O in wet or dusty environments — the IP65 rating means the module and its M12 ports stand up to washdown and airborne grit on a conveyor line or packaging cell.
Each output is rated 2 A at 24 V DC for signal '1', with a permissible range from 5 mA minimum to 2.4 A maximum per channel — so it drives solenoids, contactors, and indicator lamps within that window, but not motor starters directly. The total current is temperature-dependent: 6 A per channel up to 20 °C, derated to 4 A at 55 °C. That derating curve matters if the module sits inside a crowded, warm cabinet or near a heat source. Switching speed hits 100 Hz with resistive loads, but drops to 1 Hz on lamp loads — incandescent inrush will limit cycle rate, so don't plan fast strobe or pulsed lamp control on these outputs. Short-circuit protection is electronic and per-channel, so a faulted output won't take down the whole group. The response threshold is typ. 3 A, which clears a short before the backplane fuse or power supply trips.
The module measures 110 mm high, 87 mm wide (60 mm module width), and 55 mm deep — it mounts on the ET 200X base module and connects via the 5-pole M12 connector, so no terminal block wiring inside the panel. Power draw from the backplane bus is 28.5 mA at 5 V DC; the load voltage 2L+ draws up to 12 mA without load. Isolation is tested at 500 V DC between the backplane bus and all other circuits, with 75 V DC/60 V AC between different circuits. No channel-to-channel isolation, so outputs share a common reference — plan your load grouping accordingly.
Marked as a spare part with lifecycle stage 'current' — meaning Siemens still supports it as a replacement for existing ET 200X installations, but it's not the go-to for new designs. The ET 200X platform has been superseded by ET 200SP and ET 200eco PN. For a line-down situation, this is the exact drop-in for a failed EM 142. No rewiring, no re-addressing — same M12 pinout, same backplane bus.