Allen-Bradley 1756-OF8I Eight-Channel Analog Output Module

Allen-Bradley 1756-OF8I is an eight-channel isolated analog output module for ControlLogix systems, designed to sit in a 1756 I/O chassis and connect via a 36-pin field-side interface. Each of its eight channels can be configured as either a voltage output (ranges -10 to 10 V, 0 to 10 V, or 0 to 5 V) or a current output (0 to 20 mA), with per-channel isolation to safeguard the controller and field devices. The module delivers 24-bit resolution per channel, with detailed counts such as 0-10.5 V at 0.16 mV per count, -10 to 10 V at 0.32 mV per count, 0-5.25 V at 0.08 mV per count, and 0-21 mA at 0.32 μA per count, and is supported by firmware version 4.012. Backplane power draw varies with mode and load, typically around 6.3 W in voltage mode or with lighter loads, increasing to about 10.2 W with heavier current-mode loads (e.g., 1 kΩ) and a nominal 24 V supply current around 200 mA per module. This combination makes the 1756-OF8I suitable for precise, isolated signal delivery to actuators, valves, and other analog devices within a Rockwell Automation ControlLogix control environment.