Siemens S5-115U Error BAU: No terminator in the central controller

Siemens S5-115U Programmable Controller · taken from the manufacturer’s manual, pages cited

Error codeBAU

No terminator in the central controller due to missing or low battery requiring replacement and reset. The manual's first action is: “Replace the battery. Perform an Overall Reset. Reload the program.”

Model
Siemens S5-115U
Display shows
No terminator in the central controller (BAU)
Type
Error code
Source
Manual p. 138

What BAU means

No terminator in the central controller p. 138

Common causes

  • There is no battery or the battery is low and the retentive feature is required. p. 138
  • No terminator in the central controller p. 138

What to do

  1. Replace the battery. Perform an Overall Reset. Reload the program. p. 138

Before you service the product, read the safety instructions in the manual p. 414.

If BAU is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Siemens service.

Open the manual at page 138 All S5-115U error codes Manual details & download

This page summarises what the manufacturer’s manual says about BAU; 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.