CONTROL-BUS ERR.

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An error is detected on the system bus. This indicates a communication or integrity issue within the system's internal data highway. It can also signify a fault of the main or extension base unit.

• An error is detected on the system bus.
• Fault of the main or extension base unit was detected.

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1. 1

   Reset the CPU module and RUN it again. If the same error is displayed again, the intelligent function module, CPU module or base unit is faulty.