Switching Off The Cpu Module; Status Leds Of The Cpu Module - Siemens SIMATIC CN 4100 Equipment Manual

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
Power supply
RUN
STOP
Master
Standby
AH failure
CN 4100 Communication System
Equipment Manual, 10/2021, A5E50871363-AA
Master module
Continuous light Flashes
Power supply OK
RTC running
RTC stopped
RTC is master
Cycle / Engineering run‐
ning
RTC has detected stand‐ Synchronization stand‐
by by
Plant network discon‐
nected
8.1 Operating the CPU module
Standby module
Continuous light Flashes
Power supply OK
RTC running
RTC stopped
LED is off
RTC in standby mode Synchronization stand‐
by
Plant network discon‐
nected
Operation
53