DiagnosisΒΆ
The AC500 CPU can display various errors according to the error classes. The following error classes are possible. The reaction of the CPU is different for each type of error.
| Error class | Type | Meaning | Example |
|---|---|---|---|
E1 ERR-LED is ON |
Fatal error | A safe function of the operating system is no longer guaranteed. | Checksum error in the system Flash or RAM error |
E2 ERR-LED is ON |
Severe error | The operating system is functioning without problems, but the error-free processing of the user program is no longer guaranteed. | Checksum error in the user Flash, independent of the task duration |
E3 ERR-LED is ON/OFF* |
Light error | It depends on the application, if the user program should be stopped by the operating system or not. The user should decide, which reaction is necessary. | Flash could not be programmed, I/O module has failed |
E4 ERR-LED is ON/OFF* |
Warning | Error in the periphery (e.g. I/O) which only can have influence in the future. The user should decide the reaction to provide. | Short-circuit at an I/O module, the battery is exhausted or not inserted |
* The behaviour if the ERR-LED lights up at error classes E3 or E4 is configurable.
Occurred errors can be displayed with the commands IO-bus stat or IO-bus desc in the PLC-Browser of the PS501 Control Builder Software.