Siemens 6AV5020-1BD11-0BA0R SIMATIC OP 20

Common Error Codes & System Events

System Error 1

Communication error between OP 20 and connected PLC; connection to the controller cannot be established.
Check MPI or serial cable connections and termination resistors. Verify PLC address settings match those configured in ProTool. Restart both the panel and PLC.

System Error 2

Configuration data on the panel is invalid or corrupted; the project loaded does not match the connected controller.
Re-download the project from ProTool or WinCC flexible to the OP 20. Verify the correct PLC type and address are configured in the project.

System Error 4

Memory error detected; internal memory checksum failure or project data could not be read correctly.
Perform a factory reset on the OP 20 and re-transfer the project. If the error persists, the internal memory module may require replacement.

System Error 6

Watchdog timeout; the panel firmware has detected a software hang or processing overload.
Power cycle the OP 20. If the fault recurs, check for excessive tag polling or reduce the number of active alarms in the project configuration.

System Error 10

Transfer mode active; the panel is waiting for a project download and is not in normal operating mode.
Initiate a project transfer from the configuration PC using ProTool or WinCC flexible, or press the appropriate key combination to exit transfer mode if no download is intended.

System Error 20

No project found on the panel; the device has been reset or delivered without a loaded project.
Connect a configuration PC with ProTool or WinCC flexible and download a valid project to the OP 20 panel.

Alarm Overflow

The number of active alarms exceeds the panel's alarm buffer capacity, causing older alarms to be overwritten.
Acknowledge and clear active alarms. Review the alarm configuration in the project to reduce simultaneous alarm generation or increase acknowledgment frequency.