Allen-Bradley 1771-OD USNT Digital Output Module

The Allen-Bradley 1771-OD USNT is a six-point, isolated AC digital output module designed for PLC-5/1771 Universal I/O systems, providing six 92–138 VAC outputs at 47–63 Hz with up to 2 A per channel. Each output is independently protected by a 5 A, 3AG normal-blow fuse, and module backplane current is 225 mA. The unit offers channel-to-channel isolation of 1000 V and 1500 V isolation to the backplane, with field wiring lengths up to 1000 ft (304.8 m). Power dissipation is specified at 4 W per output, with a module-wide maximum of 13.2 W (min 1.2 W), and it can tolerate surge currents up to 20 A for 100 ms (repeatable every 5 seconds). Operational temperature is 0 to 60 C with storage from -40 to 85 C, and 5 to 95% relative humidity (non-condensing). The 1771-OD is used to switch AC loads such as relays and contactors within the PLC-5/1771 I/O ecosystem.