PLC PWR light is off.
- The power supply is abnormal, please replace the power supply.
PLC RUN light flashes.
- Firmware error;
- PLC wiring error,
- PLC is in the protection status;
- PLC internal parts are damaged.
PLC BAT light is on.
- The BAT lights on is most likely because the battery is run out of power. it is recommended to replace the internal battery of the PLC. You can open the BD board socket, remove the film, and replace the battery. (See "LX3V/LX5VInstallation Manual ") If the new battery is replaced, BAT light is still on, it may be internal problems of PLC. It is recommended to troubleshoot hardware problems.
ERR light of LX3V is on.
- First, Check what is the error code prompted when the ERR is on by the monitoring of PLC software, and then read the firmware version number (the value of D8001 and D8101) of PLC, as well as the label information.
- When the ERR light flashes, it means the content of PLC program changes due to external reasons, and the possible reasons are: Lithium battery voltage drop, influence of external interference and PLC internal failure. Please contact technician to confirm the problem. It may also flashes for syntax errors when writing the program.
- When the ERR light flashes, it means that the constants of timer and counter are not set, or the program is wrong and the contents of the program memory are inappropriate. Please clear PLC device memory after checking the program, and then download the program again.
The RUN light and ERR light flash alternately.
- Firmware error.
The PWR light and ERR light flashes at the same time.
- Check whether the power supply is normal and whether the power supply wiring is correct.