EL
ErrorLib
Brands
||
  1. Home
  2. Heidenhain
  3. NC Control
  4. 7955 A850
About·Privacy·Terms

ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

7955 A850

CC SBH rot. speed = 0 %.2s

Heidenhain · NC Control

What does 7955 A850 mean?

The standstill monitoring (SBH) was set to 0, or parameter MP1054.x = 0, or an internal software error occurred. This implies that the safety function for standstill monitoring is incorrectly configured or malfunctioning.

Common Causes

  • Standstill monitoring was set to 0.
  • Parameter MP1054.x = 0.
  • Internal software error.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the setting of parameter MP1054.x (traverse per motor revolution) for the affected axis; ensure it is not set to 0 if standstill monitoring is active and movement is expected.

  2. 2

    Check other safety parameters related to SBH (Safe Controlled Stop or Standstill Monitoring) to ensure they are configured correctly for the application.

  3. 3

    Power cycle the NC control to clear any transient internal software errors.

  4. 4

    Document the current parameter settings and operating conditions to provide to a service agency if the issue persists.

Browse all codes in this manual (58)
Verified technical data. Last updated: April 2026

Related Faults

10590 E004SH1 status test to active10591 E005SH1 status test to inactive10592 E010SH2 status test to active
Source: Heidenhain NC Control
Open Manual (Page 303)Search more codes in this manual