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Siemens SINUMERIK Controller
PLC · Intermediate · 30-120 minutes
Siemens 840D 109001 - No switchover: Switchover disable set in current PLC
Siemens SINUMERIK alarm 109001: No switchover: Switchover disable set in current PLC. This alarm indicates a required configuration element, parameter, or program component is missing or has not been set up.
109001
Siemens 840D 109001 - No switchover: Switchover disable set in current PLC
No switchover: Switchover disable set in current PLC
Siemens SINUMERIK alarm 109001: No switchover: Switchover disable set in current PLC. This alarm indicates a required configuration element, parameter, or program component is missing or has not been set up.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- Required machine data or parameter not configured for the requested function
- Option bit not set in SINUMERIK to enable the required functionality
- Program references a function or axis that has not been configured
- Machine commissioning incomplete — required setup step was not performed
- Configuration data cleared or lost due to a parameter reset or hardware change
Troubleshooting Steps
- 1Read the full alarm message to identify what is missing (axis name, parameter number, function name).
- 2Consult the SINUMERIK alarm manual for alarm 109001 for the specific configuration requirement.
- 3Check the relevant machine data group and set the required parameter.
- 4If a specific option is required, verify it is licensed and enabled in the SINUMERIK option settings.
- 5Power cycle after making configuration changes to apply the new settings.
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