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Note the exact block number where alarm occurred and review the NC program line in the editor.

Check all numerical parameters in the flagged block against machine data limits (axis travels, max feedrate MD36200, max spindle speed MD35110).

Verify tool numbers exist in active tool management (T parameter) and magazine configuration data.

Correct the out-of-range value, reload the program, and test in single block mode.

Always verify machine data limits before modifying parameters to avoid mechanical collisions.

Identify the G-code function in the alarm block and reference Siemens Programming Manual for required parameter combinations.

Check for conflicting G-codes from the same modal group (e.g., G02/G03 with G00/G01) or missing mandatory parameters (e.g., G02/G03 without I, J, K or radius definition).

Verify parameter format matches syntax requirements (address letters, decimal points, sign conventions) for the Siemens 840D system.

Correct the syntax error or remove conflicting parameters, then validate program with syntax check function before execution.

Identify which cycle or subprogram is being called in the error block and note all R-parameters or variables being transferred.

Cross-reference the cycle call against Siemens cycle documentation or subprogram definition to verify correct parameter count and sequence.

Check that all mandatory parameters are assigned values and optional parameters use permissible defaults or are properly omitted.

Correct the cycle call parameters, ensure R-parameter assignments precede the cycle call if required, and retest the program.

Incorrect drilling cycle parameters can cause tool breakage - verify depth, retract, and clearance values before execution.