Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-60 minutes

Alarm 16957

Siemens 840D 16957 - Channel Stop-Delay area is suppressed

The program area (Stop-Delay area), which is put into brackets through DELAYFSTON and DELAYFSTOF, could not be activated. Every stop therefore becomes effective immediately and is not delayed! This occurs every time, when braking into a stop Stop-Delay area, i.e. a braking process starts before the

Siemens SINUMERIKServo/AxisIntermediate30-60 minutes

16957

Siemens 840D 16957 - Channel Stop-Delay area is suppressed

Channel Stop-Delay area is suppressed

The program area (Stop-Delay area), which is put into brackets through DELAYFSTON and DELAYFSTOF, could not be activated. Every stop therefore becomes effective immediately and is not delayed! This occurs every time, when braking into a stop Stop-Delay area, i.e. a braking process starts before the

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • DELAYFSTON or DELAYFSTOF commands not properly defined or missing in program
  • Stop-Delay area brackets improperly nested or mismatched in NC program
  • Channel safety functions or motion control logic preventing delayed stop execution
  • Conflicting G-code commands overriding the Stop-Delay area parameters
  • Firmware or parameter settings disabling delayed stop functionality

Troubleshooting Steps

  1. 1Verify DELAYFSTON and DELAYFSTOF commands are correctly placed and paired in the NC program without nesting conflicts
  2. 2Check that no emergency stop, axis limit, or safety interlock is active that would prevent Stop-Delay execution
  3. 3Review machine parameters related to stop delay functionality and confirm they are not set to suppress this feature
  4. 4Examine the program logic around the braking process to ensure competing stop commands or motion blocks are not present
  5. 5Test with a simple NC program containing only DELAYFSTON/DELAYFSTOF brackets to isolate whether the issue is program-specific or system-wide

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Always verify with your machine manual or a certified technician before performing service procedures.