About the 1769-OF8C

The 1769-OF8C is used with Allen Bradley’s MicroLogix 1500 and 1769 CompactLogix family of controllers. This module has Eight (8) differential output channels configurable for 0-20mA and 4-20 mA. The module support single-ended output configuration. Single ended wiring configuration is a wiring method that compares the signal wire to a reference ground. The 1769-OF8C has modules series A and B. Series A does not allow the use of an external power supply while series B module allows external 24VDC power. Enable this option in Series B modules by activating the “Using external +24VDC Power Source” in the programming software. Analog outputs are used drive modulating actuators and devices allowing multiple points and control and increased accuracy and precision. The module has a built-in Digital to Analog converter that converts the Digital data format stored in the CPU to Analog signal. Data formats are configured using RSLogix500 when used with a MicroLogix500 controller, RSLogix5000 or Studio5000programming software when used with CompactLogix controller. Data formats are defined to characterize the output of the controller according to its external use. Data formats available are Raw / Proportional data, Engineering unit, Scaled for PID and Percent full range. Other important parameters offered by the module include enabling of channels, output range selection, module inhibition, module description and slot assignment. The module generates a unique data table for each instance of installation where the channel addresses, module mode bits, module state and other runtime parameters. Install as many 1769-OF8C as required in a MicroLogix 1500 controller or CompactLogix chassis with reference to the power supply distance rating of 8 modules. More advanced CompactLogix processor may support more than 16-30 module in the local chassis. Should more than 8 instances of 1769-OF8C is needed, an appropriate system or bank power supply is required. The module performs self-test in the event when module is power cycled. During the power cycle phase, the module may have no indication until the completion of the self-test. Once in active operation, each new value in the output module is compared to the set high and low clamps. High and low clamps prevent the analog output from exceeding the set limits.