Cause : Internal fault number 8 comes when I/O fault (digital input/output, relay or analog input/output). Encountering an "I/O fault" related to digital input/output (I/O), relay, or analog input/output (I/O) typically indicates an issue with the input or output signals of a device.
Here's how you can approach troubleshooting such a fault:
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Check Wiring Connections: Inspect the wiring connections for the affected I/O modules. Loose or improperly connected wires can cause intermittent faults or complete signal loss. Ensure that all connections are secure and properly terminated according to the device's documentation.
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Verify Power Supply: Ensure that the power supply to the I/O modules is stable and within the specified voltage range. Fluctuations or insufficient power can lead to unreliable operation or faults in the I/O signals.
