|
Error severity |
Type |
Description |
Example |
|---|---|---|---|
|
1 |
Fatal errors |
Safe operation of the operating system is no longer ensured. |
Checksum error in system flash, RAM error |
|
2 |
Severe error |
The operating system works correctly, but the error-free execution of the user program is not ensured. |
Checksum error in user flash memory, task cycle times exceeded |
|
3 |
Minor errors |
It depends on the application whether the user program has to be stopped by the operating system or not. The user decides which reaction is to be done. |
Flash memory cannot be programmed, I/O module failed |
|
4 |
Warnings |
Errors that occur on peripheral devices or that will have an effect only in the future. The user decides which reactions are to be done. |
Short circuit in an I/O module, battery empty/not installed |
|
11 |
Parameter error |
Error occurred during parameter setting |
Different I/O devices in PLC configuration and hardware installation |
Errors with error severitiy 1 - fatal errors
Errors with error severitiy 1 - fatal errors
Errors with error severity 1 are not entered in the diagnosis system. These errors do not allow normal operation of the PLC. These errors are detected during PLC start-up and stop the PLC immediately.
Examples are RAM errors or checksum errors when starting the firmware.
Such errors are indicated by rapid flashing of the ERR LED.