Components You can find information about diagnostic options in the following manuals and 
sections:
ET 200M Manual 
SIMATIC;
ET 200M Distributed I/O; 
Commissioning and Diagnostics
● Diagnostics by means of LED display IM 153-1, IM 153-2
● Diagnostics with STEP 7
ET 200iSP Manual 
SIMATIC;
ET 200iSP Distributed I/O; Commissioning and Diagnostics
● Status and error LEDs on IM 151-2
● Insertion and removal of modules
● Line break of the NAMUR encoder on the digital input module
● Diagnostics with STEP 7
ET 200pro Manual 
SIMATIC;
ET 200pro Distributed I/O System; Commissioning and diagnostics
● LED display ...
● Insertion and removal of modules
● Diagnostics with STEP 7
ET 200S Manual 
SIMATIC;
ET 200S Distributed I/O; Commissioning and Diagnostics
● Diagnostics by means of LED displays
● Diagnostic messages for electronic modules
DP/PA Coupler Manual 
SIMATIC; 
Bus couplers DP/PA- Link and Y-Link
Diagnostics by means of LED displays
● LED displays of the IM 157
● LED displays of the DP/PA coupler
● LED displays of the Y coupler
Y-Link Information under DP/PA Coupler
FF Link Manual 
SIMATIC; 
Bus couplers FF- Link
AFD 
(use on fieldbus - 
PROFIBUS PA or 
FOUNDATION 
Fieldbus)
Manual 
SIMATIC;
SIMATIC NET; PROFIBUS PA
● Diagnostics by means of LED displays
● Diagnostic messages for electronic modules
AFS (use on fieldbus - 
PROFIBUS PA or 
FOUNDATION 
Fieldbus)
Manual 
SIMATIC;
SIMATIC NET; PROFIBUS PA
● Diagnostics by means of LED displays
● Diagnostic messages for electronic modules
Diagnostics in PCS 7
7.17 Diagnostics for hardware displays
Service support and diagnostics (V8.0)
88 Service Manual, 03/2012, A5E02779775-02