Siemens S5-115U Error PEU: I/Os not ready: power failure in the I/O expansion unit; connection to the I/O expansion unit interrupted.

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

Error codePEU

I/Os not ready because of power failure, interrupted connection, or no terminator in the central controller. The manual's first action is: “• Check the power supply in the expansion unit. • Check the connection. • Install a terminator in the central controller.”

Model
Siemens S5-115U
Display shows
PEU
Type
Error code
Source
Manual p. 138

What PEU means

I/Os not ready: power failure in the I/O expansion unit; connection to the I/O expansion unit interrupted. p. 138

Common causes

  • The I/Os are not ready: • There has been a power failure in the expansion unit. • The connection to the expansion unit has been interrupted. • There is no terminator in the central controller. p. 138
  • I/Os not ready: power failure in the I/O expansion unit; connection to the I/O expansion unit interrupted. p. 138

What to do

  1. • Check the power supply in the expansion unit. • Check the connection. • Install a terminator in the central controller. p. 138

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

If PEU 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 PEU; 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.