Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual page 41

Note
LED colors when the module starts up
When the module starts up, all its LEDs are lit for a short time. Multicolored LEDs display a
color mixture. At this point in time, the color of the LEDs is not clear.
Display of the basic statuses of the CP ("DIAG" LED)
Table 2- 4
Basic statuses of the CP
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
Display of the basic statuses of the CP
DIAG Meaning
(red / green) (if more than one point listed: alternative meaning)
•
•
Running (RUN) without serious error
green
Partner not connected
flashing green
•
•
flashing red
•
•
Loading firmware.
flashing red-green
Power OFF
Incorrect startup
Starting up
Module fault
Backplane bus error
Invalid STEP 7 project data
LEDs and connectors
2.2 LEDs
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