Allen-Bradley 1791-8AC Block I/O Digital Module

The Allen‑Bradley 1791-8AC Block I/O Module is a Series B digital I/O block offering 16 discrete channels: eight 120 VAC inputs and eight 120 VAC outputs, all in a single compact module. Each input channel is designed for 120 VAC operation and presents a nominal input current of about 11 mA, while the outputs are AC-rated with an operating voltage range of 20 to 132 VAC, suitable for switching line‑voltage devices such as relays and contactors. The 1791-8AC mounts directly to a compatible Allen‑Bradley controller as a Block I/O device and supports both horizontal and vertical mounting to fit various panel layouts. As a 16-point block, it provides a straightforward means to expand discrete control for AC field devices within classic Allen‑Bradley control architectures, delivering reliable direct I/O connection without intermediate adapters. The model is commonly identified as 1791-8AC, with eight inputs and eight outputs, 16 total points, configured for 120 VAC operation.