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Check machine data MD28020 $MC_TOOL_CHANGE_MODE for the affected channel to verify if tool management is enabled.

Verify MD18100 $MN_MM_NUM_TOOL_CARRIER and MD18110 $MN_MM_NUM_TOOL to confirm tool offset memory allocation.

Check if the channel requires tool offset configuration by reviewing machine data MD20110 $MC_TOOL_MANAGEMENT_MASK for the channel.

Modifications to tool management settings require machine data backup and may require PLC adaptation.

If tool offsets are needed, configure appropriate machine data and perform a control reboot with power on reset (POR).

Always backup machine data before making configuration changes.

Review the NC program to identify where tool offset commands (T, D, or TOFFON) are being called.

Check which channel is active when the alarm occurs by reviewing the alarm context and channel number display.

Verify if the program should be running in a different channel by checking the CHANDATA or channel assignment commands.

Either move the tool offset operations to the correct channel or remove tool offset commands from the auxiliary channel program.

Ensure channel synchronization commands are properly implemented if coordinating multiple channels.

Check the total number of tool offsets configured in MD18110 $MN_MM_NUM_TOOL and verify it matches the application requirements.

Review MD18100 $MN_MM_NUM_TOOL_CARRIER to ensure sufficient tool carrier locations are allocated.

Perform a power on reset (POR) to reinitialize the tool management system and reallocate memory structures.

POR will clear all dynamic data including offsets and part programs in NCK memory.

If the issue persists, check NCK memory allocation in diagnostics and consider increasing tool management memory if available NCK memory permits.

Consult Siemens documentation for your specific control version before modifying memory allocation.