Siemens S7-1200 PROFIBUS - Page 15

Displays and connectors
2.2 LEDs
SIMATIC CM 1242-5
Operating Instructions, 01/2023, C79000-G8976-C245-06
15
The LEDs indicate the operating and communications status of the module according to the
following scheme:
Table 2- 4 Display of the basic states of the module by the "DIAG" LED
DIAG
(red / green)
Meaning Comment
Power OFF
green
RUN without errors
flashing green
• Startup
• STOP without errors
• No project data
• Firmware update
The individual states are signaled by the
RUN/STOP and ERROR LEDs (see below).
flashing red
Problem / error The individual states are signaled by the
RUN/STOP and ERROR LEDs (see below).
Table 2- 5 Display schemes for detailed module statuses
DIAG
(red / green)
-
RUN/STOP
(yellow /
green)
ERROR
(red)
Meaning
Detailed status schemes
green
RUN without errors,
Exchange of user data with DP master
flashing green
• Stopped (STOP) without errors
• No project data available
flashing green
Starting up (STOP → RUN)
flashing green
Loading firmware
(The DIAG and RUN/STOP LEDs flash alternately.)
flashing red
- If a master-slave connection is established:
• DP master CPU in STOP, "CLEAR" on PROFIBUS
or
• Slave error