Allen-Bradley 1756-OF8I Analog Output Module Isolated

Allen-Bradley 1756-OF8I is an eight-channel isolated analog output module for ControlLogix systems, designed to drive external analog devices with voltage or current signals. Each of the eight outputs is galvanically isolated from the others and from the backplane, offering 250 V continuous isolation between channels to protect the controller and improve signal integrity. The module uses a 36‑pin terminal block and can be configured for either voltage or current output per channel, enabling flexible control of actuators and other analog devices within a single chassis. In voltage-output mode, the circuitry relies on an internal reference, with wiring diagrams showing a +13 V reference feeding the D/A converter (OUT_x/V) for voltage outputs. The 1756-OF8I is part of Rockwell Automation’s ControlLogix 1756 I/O family and interfaces with the standard 1756 backplane in typical ControlLogix installations. Common applications include driving analog actuators such as valves and motor controllers in process or factory automation, where isolated outputs help minimize interference and ground-loop issues.