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Siemens SINUMERIK Controller
Spindle · Intermediate · 30-120 minutes
Siemens 840D 16696 - Channel block following axis/spindle coupling has not been
Alarm 16696 occurs when an NC program attempts to execute a spindle coupling command (e.g., COUPLE, COUPLE_1, COUPLE_2) that has not been properly defined or initialized in the machine tool's coupling configuration. This typically results from missing machine data parameters, undefined coupling identifiers in the part program, or incomplete NCK coupling setup.
16696
Siemens 840D 16696 - Channel block following axis/spindle coupling has not been
Channel block following axis/spindle coupling has not been
Siemens SINUMERIK 840D alarm 16696: Channel block following axis/spindle coupling has not been. This alarm indicates a program or channel-level error on the SINUMERIK control. The part program or machine function cannot be executed as commanded.
Root Cause Summary
Alarm 16696 occurs when an NC program attempts to execute a spindle coupling command (e.g., COUPLE, COUPLE_1, COUPLE_2) that has not been properly defined or initialized in the machine tool's coupling configuration. This typically results from missing machine data parameters, undefined coupling identifiers in the part program, or incomplete NCK coupling setup.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access Siemens HMI > Diagnostics > Machine Data (or via SINUMERIK Operate). Navigate to MD 32100 and verify CouplingType is defined (typically: 0=None, 1=Synchronous, 2=Asynchronous).
Do not modify MD parameters during active machine operation.
- 2
Check MD 32101 (CouplingIdentifier) and MD 32102 (CouplingNr) to confirm the coupling name/number matches the identifier used in the COUPLE instruction in your NC program.
- 3
If parameters are missing, consult the OEM machine tool documentation to populate MD 32100-32110 with correct coupling configuration. Save changes and perform warm restart (POWER ON/OFF cycle).
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