Siemens SIMATIC NET S7-1200 Operating Instructions Manual page 20

LEDs and connectors
2.2 LEDs
Table 2- 5
(red / green)
Detailed status schemes
flashing green
flashing green
flashing green
flashing red
flashing red
In STOP mode, configuring and performing diagnostics on the CM remain possible.
20
Display schemes for detailed module statuses
DIAG - RUN/STOP
(yellow /
green)
green
ERROR Meaning
(red)
RUN without errors,
Exchange of user data with DP master
• Stopped (STOP) without errors
• No project data available
Starting up (STOP → RUN)
Loading firmware
(The RUN/STOP and ERROR LEDs flash alternately.)
RUN with PROFIBUS problem:
• DP slave errors
• No master-slave connection
• PROFIBUS cable not connected or not detected
System fault:
• CM has not received an address from the CPU
• Power supply of the CM was interrupted
• CPU reset to factory defaults
Solution when the error is permanent: Station
power → OFF → ON
Other possible problems:
• Module fault
• Incomplete firmware version
Contact the hotline.
Operating Instructions, 01/2023, C79000-G8976-C246-06
SIMATIC CM 1243-5