Allen-Bradley 1756-OF4 A 4-Channel Analog Output Module

The Allen-Bradley 1756-OF4 A is a four-channel, non-isolated analog output module designed for Rockwell Automation’s ControlLogix backplane. This 1756 module mounts in a ControlLogix 1756 backplane and provides four output channels that are configured for analog signaling—either current outputs (0–20 mA) or voltage outputs (0–10 V)—using a 20‑pin terminal interface. As a non-isolated output module, all channels share a common reference with the backplane, which is typical for 1756-series analog outputs. The 1756-OF4 A is part of the ControlLogix analog I/O family and is used to translate PLC setpoints into analog signals that drive actuators such as valves, positioners, or motor controllers, enabling precise proportional control in industrial automation systems.