Allen Bradley 1771-CP1 Module

Output Modules in a Local Chassis

The owner-controller updates ControlLogix digital output modules in the local chassis at the end of every task and at the RPI. When you specify an RPI value for a digital output module, you instruct the owner-controller when to broadcast the output data to the module. If the module resides in the same chassis as the owner-controller, as shown in the illustration below, the module receives the data almost immediately after the ownercontroller sends it. Backplane transfer times are small.

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