Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Troubleshooting

6. Troubleshooting

Symptom

Diagnosing Input Malfunction

Diagnosing Output Malfunction

Troubleshooting and Corrective Actions

When input indicator LEDs are OFF,

1.Check the wiring of the input devices.

2.Check that the power is properly supplied to the input terminals.

3.If the power is properly supplied to the input terminal, there is probably an abnormality in the PLC’s input circuit. Please contact your dealer.

4.If the power is not properly supplied to the input terminal, there is probably an abnormality in the input device or input power supply. Check the input device and input power supply.

When input indicator LEDs are ON,

1.Monitor the input condition using a programming tool. If the input monitored is OFF, there is probably an abnormality in the PLC’s input circuit. Please contact your dealer.

2.If the input monitored is ON, check the program again. Also, check the leakage current at the input devices (e.g., two-wire sensor) and check for the duplicated use of output or the program flow when a control instruction such as MC or CJ is used.

3.Check the settings of the I/O allocation.

When output indicator LEDs are ON,

1.Check the wiring of the loads.

2.Check if the power is properly supplied to the loads.

3.If the power is properly supplied to the load, there is probably an abnormality in the load. Check the load again.

4.If the power is not supplied to the load, there is probably an abnormality in the PLC’s output circuit. Pleas contact your dealer.

When output indicator LEDs are OFF,

1.Monitor the output condition using a programming tool. If the output monitored is turned ON, there is probably a duplicated output error.

2.Forcing ON the output using a programming tool. If the output indicator LED is turned ON, go to input condition check. If the output LED remains OFF, there is probably an abnormality in the PLC’s output circuit. Please contact your dealer.

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