DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming
6-2
6.1 Common 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
flashing
1. If the ERROR LED is flashing, the problem may be an invalid
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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