What causes Siemens SINUMERIK alarm 101131?

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.

How do I fix Siemens SINUMERIK alarm 101131?

1. Read the full alarm message to identify what is missing (axis name, parameter number, function name). 2. Consult the SINUMERIK alarm manual for alarm 101131 for the specific configuration requirement. 3. Check the relevant machine data group and set the required parameter. 4. If a specific option is required, verify it is licensed and enabled in the SINUMERIK option settings. 5. Power cycle after making configuration changes to apply the new settings.

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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 101131

Siemens 840D 101131 - No controller disable on PI Start

Alarm 101131 occurs when the controller fails to disable properly during a PI (Program Interrupt) start sequence. This indicates a synchronization issue between the NC kernel and the PLC, where the controller remains active when it should be disabled during the PI operation startup. The alarm prevents potential motion conflicts or unsafe machine states during interrupt processing.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101131

Siemens 840D 101131 - No controller disable on PI Start

No controller disable on PI Start

Root Cause Summary

Alarm 101131 occurs when the controller fails to disable properly during a PI (Program Interrupt) start sequence. This indicates a synchronization issue between the NC kernel and the PLC, where the controller remains active when it should be disabled during the PI operation startup. The alarm prevents potential motion conflicts or unsafe machine states during interrupt processing.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access the PLC program and monitor DB19.DBX1.5 (Controller Enable/Disable) signal in real-time during operation.
2
Check PLC cycle time in OB1 - ensure it is not exceeding 50ms. Optimize PLC program if cycle time is too long.
3
Verify the PLC logic that controls the disable signal during PI operations includes proper interlocks and timing sequences.
4
Test by manually triggering controller disable from the PLC and observing if the NC responds correctly without alarm.
Ensure machine is in a safe state before manual testing

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