Analyzing The Communications Modules; Power Led Of The I/O Modules - Siemens SIMATIC CN 4100 Equipment Manual

Operation

8.2 Analyzing the communications modules

LED
RL failure
COMM error
Meaning for non-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
RL failure
COMM error
8.2 Analyzing the communications modules
8.2.1

Power LED of the I/O modules

Definition
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
Off
Continuous light
54
Master module
Continuous light Flashes
Failure of redundancy Failure of redundancy
connection (both) connection (single)
Error com plugin to
field devices;
Grouped with multiple
com plugins
Standby module
Continuous light
Failure of redundancy
connection (both)
Error com plugin to
field devices;
Grouped with multiple
com plugins
Continuous light
Power supply OK
RTC running
RTC stopped
RTC is master
Cycle / Engineering running
LED is off
Plant network disconnected
LED is off
Error com plugin to field devices;
Grouped with multiple com plugins
Meaning
Power supply error
Power supply OK
Flashes
Failure of redundancy
connection (single)
CN 4100 Communication System
Equipment Manual, 10/2021, A5E50871363-AA