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Review the NC program block that triggered the alarm. Identify all instructions present: check for mixed spindle instructions (S, M3, M4, M5, SPOSA, SPOS) alongside axis motion (G01, G02, G03) or feed rate declarations (F).

Verify the following axis/spindle coupling configuration in machine data: navigate NCK > Machine Data and confirm MD32100 (AXIS_TYPE) and MD32110-MD32120 (coupling parameters) for the affected channel. Check if GENERIC_COUPLING is enabled.

Generic coupling restrictions are stricter than electronic camming; review the specific coupling type enabled.

Separate incompatible instructions into consecutive blocks. For example, program the spindle speed command (S1200 M3) in one block, then initiate following axis motion (G01 X100 F500) in the next block.

Consult the SINUMERIK 840D Programming Guide section on 'Following Axes and Spindles' to confirm which instruction combinations are permitted for your specific coupling configuration.

Examine the alarmed block for SPOS or SPOSA instructions paired with F-word or G01/G02/G03 commands. These combinations are invalid for generic-coupled following axes.

Check machine data parameter MD32115 (SPINDLE_SYNC_MODE) to confirm the coupling synchronization method. If set for generic coupling, SPOS and feed-based interpolation cannot occur together.

Restructure the program: execute SPOS/SPOSA in a dedicated block without F-word, then perform feed-based axis motion in the subsequent block after spindle positioning is complete.

If spindle-synchronized motion is required, verify that the coupling is configured for ELECTRONIC_CAMMING (MD32110) rather than GENERIC_COUPLING, which permits more flexible instruction combinations.

Identify the M-code or G-code in the alarmed block. Cross-reference with the Siemens SINUMERIK 840D 'Incompatible Instructions' table in the Programming Guide to confirm restrictions for generic-coupled following axes.

Check PLC memory variable MD10202 (CHAN_COUPLING_TYPE) for the affected channel to confirm generic coupling is active, and verify MD32100-MD32135 in the axis configuration data.

Separate the M-code or restricted G-code into a preceding block (e.g., M3 alone), then issue the axis motion command in the following block, allowing NCK time to process spindle state changes.

If threading (G33) or other synchronized motion is required, evaluate whether a different coupling mode (electronic camming, tandem axis, or synchronous spindle) better suits the application.