Siemens SIMATIC ET 200S Manual page 48

Getting Started
Diagnosis and troubleshooting
Faults which the CPU indicates with the group fault LED SF following memory
reset can occur as a result of incorrect operation, incorrect wiring or incorrect
hardware configuration.
How to diagnose such faults and messages is described in the following manuals:
S Installation Manual S7-300; Section 10.4
S Programming with STEP 7 V5.x; Chapter 21
S Interface module IM 151-7 CPU; Chapter 5
Other manuals
For more information on getting started we also recommend: Getting Started: First
Steps and Exercises With STEP 7 V5.x.
All of these manuals can be downloaded free of charge from the Siemens
homepage (Customer Support, Automation).
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ET 200S IM 151-7 CPU Interface Module
A5E00058783-04