Allen-Bradley 1771OADC AC Output Module

Allen-Bradley 1771-OADC AC Output Module is a 16-point digital output card for the PLC-5 backplane that directly switches AC loads in the 10–138 VAC range, operable at 47–63 Hz. Each output is rated for up to 2 A, with a collective limit of 8 A per module across all outputs. The module supports a surge current rating of 25 A per output for 100 ms (repeatable every second) and requires a minimum load current of 5 mA per output to maintain proper operation. Designed for PLC-5 systems, it plugs into 1771 I/O chassis and is intended to drive line-level devices such as relays, contactors, and other AC loads controlled by a PLC-5 program. The 10–138 VAC range accommodates typical North American power standards, while the 47–63 Hz specification covers standard utility frequencies. As part of the 1771 digital I/O family, the 1771-OADC is used when you need multiple AC outputs controlled directly from the PLC-5 processor, ensuring compatibility with backplane and mounting conventions of the PLC-5 ecosystem.