DVP - ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

6.1Common Problems and Solutions

The following tables list some common problems and troubleshooting procedures for the PLC system in the event of faulty operation.

System Operation

Symptom

 

Troubleshooting and Corrective Actions

 

 

 

All LEDs are OFF

1.

Check the power supply wiring.

 

2.

Check If the power supplied to the PLC control units is in the range of

 

 

the rating.

 

3.

Be sure to check the fluctuation in the power supply.

 

4.

Disconnect the power supply wiring to the other devices if the power

 

 

supplied to the PLC control unit is shared with them.

 

 

If the LEDs on the PLC control unit turn ON at this moment, the

 

 

capacity of the power supply is not enough to control other devices

 

 

as well. Prepare another power supply for other devices or increase

 

 

the capacity of the power supply.

 

5.

If the POWER LED still does not light up when the power is on after

 

 

the above corrective actions, the PLC should be sent back to the

 

 

dealer or the distributor whom you purchased the product from.

ERROR LED is

1.

If the ERROR LED is flashing, the problem may be an invalid

flashing

 

commands, communication error, invalid operation, or missing

 

 

 

 

instructions, error indication is given by self-checking function and

 

 

corresponding error code and error step are stored in special

 

 

registers. The corresponding error codes can be read from the

 

 

WPLSoft or HPP. Error codes and error steps are stored in the

 

 

following special registers.

 

 

Error code: D1004

 

 

Error step: D1137

 

2.

If the connections between the PLC are failed and the LED will flash

 

 

rapidly, this indicates the DC24V power supply is down and please

 

 

check for possible DC24V overload.

 

3.

The LED will be steady if the program loop execution time is over the

 

 

preset time (set in D1000), check the programs or the WDT (Watch

 

 

Dog Timer). If the LED remains steady, download user program

 

 

again and then power up to see if the LED will be OFF. If not, please

 

 

check if there is any noise interference or any foreign object in the

 

 

PLC.

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Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Common Problems and Solutions, Error LED is, Flashing