Step 1: Input Port Maintenance
A malfunction in the signal detection circuit of the PLC's input port was identified.
The damaged optocoupler was replaced.
This action restored the correct reading of signals from external sensors, re-establishing communication between the device and the PLC processor.
Step 2: Output Port Maintenance
A defective actuation relay was found in the PLC's output port, which was preventing commands from being sent to connected equipment.
The relay was replaced.
This step ensures the PLC can efficiently and reliably control external devices.
Step 3: System Validation
A test program was created and run using the PLC software.
The test validated the functionality of both the input and output ports.
This final step confirmed that input signals are being read correctly and output commands are being executed precisely, guaranteeing the full functionality of the system.