Siemens SIMATIC CN 4100 - Analyzing the Communications Modules; Power LED of the IO Modules

LED Master module Standby module
Continuous light Flashes Continuous light Flashes
RL failure Failure of redundancy
connection (both)
Failure of redundancy
connection (single)
Failure of redundancy
connection (both)
Failure of redundancy
connection (single)
COMM error Error com plugin to
󹪝eld devices;
Grouped with multiple
com plugins
Error com plugin to
󹪝eld devices;
Grouped with multiple
com plugins
Meaning for non-redundant CPU modules
The following table shows the status LEDs and their meaning.
RTC = Runtime Container
LED Continuous light
Power supply Power supply OK
RUN RTC running
STOP RTC stopped
Master RTC is master
Cycle / Engineering running
Standby LED is o󹪜
AH failure Plant network disconnected
RL failure LED is o󹪜
COMM error Error com plugin to 󹪝eld devices;
Grouped with multiple com plugins
8.2 Analyzing the communications modules
8.2.1 Power LED of the I/O modules
De󹪝nition
An communications module has a power LED to indicate the status of its power supply.
Description
The following table shows the possible states of the LED and their meaning.
LED status Meaning
O󹪜 Power supply error
Continuous light Power supply OK
Operation
8.2 Analyzing the communications modules
CN 4100 Communication System
54 Equipment Manual, 10/2021, A5E50871363-AA