Siemens SINUMERIK codes
AxisMD

axismd.ai

Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 10-20 minutes

Alarm 16962

Siemens 840D 16962 - Channel NCK computing time reduced, start is not allowed.

The computing time available to the NCK has been reduced, starts have therefore been locked. The computer performance is inadequate for smooth program execution. The computing time of the NCK may have been reduced by the HMI because of an HMI part program simulation.

Siemens SINUMERIKServo/AxisIntermediate10-20 minutes

16962

Siemens 840D 16962 - Channel NCK computing time reduced, start is not allowed.

Channel NCK computing time reduced, start is not allowed.

The computing time available to the NCK has been reduced, starts have therefore been locked. The computer performance is inadequate for smooth program execution. The computing time of the NCK may have been reduced by the HMI because of an HMI part program simulation.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • HMI part program simulation is running and consuming NCK computing resources
  • Background processes or system tasks consuming excessive CPU cycles
  • Insufficient system performance or overloaded control unit
  • NCK computing time allocation has been manually reduced through system parameters
  • Real-time task scheduling conflict between HMI and NCK processes

Troubleshooting Steps

  1. 1Stop any active HMI part program simulations and verify the alarm clears
  2. 2Check HMI status panel to confirm no background simulations or diagnostics are running
  3. 3Review NCK computing time allocation in machine parameter settings and restore to nominal values if reduced
  4. 4Restart the control system to reset process priorities and resource allocation
  5. 5Monitor system CPU load during idle and verify it returns to normal baseline after stopping conflicting processes

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

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