Leds - Siemens SIMATIC NET S7-1500 Operating Instructions Manual

LEDs

①
②
③
④
⑤
Figure 2-1
Meaning of the LED displays
The CM 1542-1 has 3 LEDs to display the current operating status and the diagnostics status
and these have the following meanings:
• RUN/STOP (single color green)
• ERROR (single color red)
• MAINT (single color yellow)
The following table shows the meaning of the various combinations of colors of the RUN,
ERROR and MAINT LEDs.
Table 2- 1
SIMATIC CM 1542-1
Operating Instructions, 04/2023, C79000-G8976-C355-05
RUN/STOP
ERROR
MAINT
X1 P1 LINK/ACT
X1 P2 LINK/ACT
LED display of the CM 1542-1 (without front cover)
Meaning of the LEDs
RUN/STOP ERROR
LED off LED off
LED lit green LED lit red
MAINT
No supply voltage on the CM or
supply voltage too low
LED off
LED test during startup
LED lit yellow
2
Meaning
23