
8.1.2.3
Switching off the CPU module
Requirement
• You have adhered to the basics for mounting.
• The supply voltage is connected to the rack.
• The CPU module has been started.
Procedure
Press and hold the reset button for 6 seconds.
Result
The system powers down together with the CPU module.
8.1.3
Status LEDs of the CPU module
Definition
The status LEDs of the CPU module provide information about the operating mode of the CPU
or indicate errors.
Meaning for redundant CPU modules
The following table shows the status LEDs and their meaning.
RTC = Runtime Container
LED
Master module
Standby module
Continuous light
Flashes
Continuous light
Flashes
Power supply
Power supply OK
Power supply OK
RUN
RTC running
RTC running
STOP
RTC stopped
RTC stopped
Master
RTC is master
Cycle / Engineering run‐
ning
LED is off
Standby
RTC has detected stand‐
by
Synchronization stand‐
by
RTC in standby mode
Synchronization stand‐
by
AH failure
Plant network discon‐
nected
Plant network discon‐
nected
Operation
8.1 Operating the CPU module
CN 4100 Communication System
Equipment Manual, 10/2021, A5E50871363-AA
53
Содержание SIMATIC CN 4100
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