Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Safety · Intermediate · 30-120 minutes

Alarm 27200

Siemens 840D 27200 - PROFIsafe: cycle time [ms] too long

Alarm 27200 indicates that the PROFIsafe communication cycle time, calculated as MD $MN_IPO_CYCLE_TIME × MD $MN_PROFISAFE_IPO_TIME_RATIO, exceeds the 25 ms maximum permissible limit. This prevents safe real-time data exchange over PROFIsafe protocol and blocks NC program execution until the cycle time is optimized.

Siemens SINUMERIKSafetyIntermediate30-120 minutes

27200

Siemens 840D 27200 - PROFIsafe: cycle time [ms] too long

PROFIsafe: cycle time [ms] too long

Siemens SINUMERIK alarm 27200: PROFIsafe: cycle time [ms] too long. This alarm indicates a fault or error condition on the SINUMERIK 840D control. Refer to the Siemens SINUMERIK alarm documentation for the complete description and remedy.

Root Cause Summary

Alarm 27200 indicates that the PROFIsafe communication cycle time, calculated as MD $MN_IPO_CYCLE_TIME × MD $MN_PROFISAFE_IPO_TIME_RATIO, exceeds the 25 ms maximum permissible limit. This prevents safe real-time data exchange over PROFIsafe protocol and blocks NC program execution until the cycle time is optimized.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Navigate to Siemens HMI: Diagnosis → Parameters → Machine Data (MD). Locate MD $MN_PROFISAFE_IPO_TIME_RATIO and record current value.

  2. 2

    Verify MD $MN_IPO_CYCLE_TIME value (typically 8, 16, or 32 ms). Calculate: $MN_IPO_CYCLE_TIME × $MN_PROFISAFE_IPO_TIME_RATIO. If result > 25 ms, reduce $MN_PROFISAFE_IPO_TIME_RATIO to 1 or 2.

    Reducing the ratio increases PROFIsafe communication frequency; ensure CPU load does not exceed 80%.

  3. 3

    Set MD $MN_PROFISAFE_IPO_TIME_RATIO to 1 (synchronous with IPO cycle). Save parameters and perform a cold reset (power cycle or RESET key on control panel).

  4. 4

    Verify alarm clears. Use Diagnosis → Alarms to confirm no 27200 or related PROFIsafe errors remain. Test safe axis motion with a simple G-code program.

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