Allen-Bradley 1771-0FE2 Analog Output Module

The Allen‑Bradley 1771-0FE2 analog output module is a four‑channel, isolated current‑output module designed for the PLC‑5 1771 I/O system. Each of its four outputs provides a 4–20 mA signal to drive field devices such as control valves, actuators, or meters, with all channels isolated from one another and from the backplane (1000 V differential). The module is powered from the 1771 backplane; it does not require an external supply, with a backplane current draw around 1.5 mA and typical power dissipation near 7.9 W. Data encoding supports Natural Binary or Binary‑coded Decimal scaling to +/- 9999, enabling precise mapping of digital values to analog current. The 1771-0FE2 is part of the Series B family (often listed as 1771-OFE2/B in catalogs) and typically uses a wiring arm such as 1771-WC for field wiring. Note that Rockwell Automation lists this analog output module as discontinued as of March 4, 2021, so it remains a common choice for servicing or upgrading legacy PLC‑5 installations rather than new designs. In real‑world use, it suits process‑control loops requiring reliable four‑channel current outputs with robust isolation, enabling independent loop operation for each channel when connected to compatible transmitters, valves, or actuation devices.