PLC - Allen Brandley

PLC Input and Output Port Maintenance

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.