What causes Siemens SINUMERIK alarm 101156?

Normal control operation generated this status message. User action or program command triggered this notification. System configuration or commissioning activity produced this message. Machine data or parameter change created this notification.

How do I fix Siemens SINUMERIK alarm 101156?

1. Read the complete message text on the SINUMERIK screen — note any parameter values shown. 2. If action is required, follow the instructions in the message. 3. Acknowledge the message on the operator panel to continue operation. 4. Consult the Siemens SINUMERIK alarm documentation for message 101156 if clarification is needed. 5. If this message appears unexpectedly, review recent parameter or configuration changes.

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Siemens SINUMERIK Controller

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

Alarm 101156

Siemens 840D 101156 - Function impermissible

Alarm 101156 occurs when a G-code function, machine function, or system operation is called that is not permitted in the current machine state, configuration, or context. This typically happens when attempting to use functions not enabled in the machine data, calling functions incompatible with the current mode, or using options not purchased/licensed for this control.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101156

Siemens 840D 101156 - Function impermissible

Function impermissible

Root Cause Summary

Alarm 101156 occurs when a G-code function, machine function, or system operation is called that is not permitted in the current machine state, configuration, or context. This typically happens when attempting to use functions not enabled in the machine data, calling functions incompatible with the current mode, or using options not purchased/licensed for this control.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Identify the exact NC program line causing the alarm by checking the alarm display for block number and reviewing the program at that location.
2
Check machine data for the specific function being called (e.g., MD20110 for transformations, MD28060 for synchronized actions, option bits in MD9xxx series) to verify if the function is activated.
3
Verify installed software options using system variable $SN_OPT_xxx or check the HMI under Commissioning > System Data > Software Options to confirm the required option is licensed.
4
If function should be available, enable it in the appropriate machine data and perform a control reboot (Power On Reset). If option is missing, contact Siemens for license upgrade.
Modifying machine data incorrectly can cause machine malfunctions. Document original values before changes.

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