The CPU is equipped with two digital inputs and two digital outputs. The use of these inputs and outputs depends on the type of communication module located to the left of the CPU. If the communication module is a Communication Digital I/O, then these inputs are reserved as described in the section on the Communication Digital I/O.
Otherwise, they can be used in the following ways.
The inputs can be used by the Input to Event table.
The inputs can be used to control transitions between Steps in the Event Step table through the Single Input (I, i, O, and o) and Multiple Inputs link types.
The outputs can be set using the Set Outputs and Reset Outputs commands.
For details on additional discrete I/O options, see Using the Communication Digital I/O and Using the Sensor Digital I/O.
It is highly recommended that the I/O Bit Monitor be used for debugging wiring of these discrete inputs.
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