Siemens CPU 31xC / CPU 31x Error BF3: Bus error at the third interface (X3)

Siemens CPU 31xC / CPU 31x · taken from the manufacturer’s manual, pages cited

Error codeBF3

Bus error at the third interface (X3) has been detected. The manual lists no action for this code.

Model
Siemens CPU 31xC / CPU 31x
Display shows
Bus error at the third interface (X3) (BF3)
Type
Error code
Source
Manual p. 54

What BF3 means

Bus error at the third interface (X3) p. 54

Common causes

  • Bus error at the third interface (X3) p. 54

If BF3 is still not resolved

  • contact service / dealer p. 2
    “Legal information Legal information Warning notice system This manual contains notices y ou have to observe in order to en sure your personal safety, as well as to prevent damage to property.”
  • contact service / dealer p. 157
    “The CPUs will change to STOP m ode if you exceed the permissible size of local data for a priority class.”
Open the manual at page 54 All CPU 31xC / CPU 31x error codes Manual details & download

This page summarises what the manufacturer’s manual says about BF3; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.