Verify cable connections and communications. Check that you are logged onto the PLC. Using the PLC Utilities \ PLC Operation menu item, attempt to log onto the PLC and then confirm you are logged in. If the Login does not persist, the cable communications may be incorrect. The Login is held by the communications cable. Incorrect pin outs or loss of continuity will not permit the Login to persist.
Check that the network is scheduled in the Segment Scheduler.
Check that you are not using the Skip Instruction.
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