When troubleshooting a PLC controlled pneumatic system using I/O indicators, what information is needed?

When troubleshooting a PLC controlled pneumatic system using I/O indicators, having a sequence chart is crucial because it outlines the expected sequence of operations and actions that the system should follow. This chart provides a clear reference for technicians to compare the actual behavior of the system against the intended operations. By doing so, they can identify where the process may be deviating from the planned sequence, which is essential for diagnosing issues effectively.

The sequence chart often includes specific conditions and inputs required to trigger different outputs, making it easier to pinpoint any discrepancies in the system's performance. This contextual understanding allows for a more efficient troubleshooting process, as technicians can systematically check each stage of operation, ensuring that all components are functioning as intended within the sequence.

Other materials, like electrical schematics or flow diagrams, while important, do not provide the same level of insight into the operation sequence that a sequence chart does, and knowledge of the PLC software version, although potentially useful, is less essential for diagnosing real-time operational issues.