Structure of the CPU 410-5H
3.3 Status and error displays
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
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LINK and RX/TX LEDs
The LINK and RX/TX LEDs indicate the current state of the PROFINET IO interfaces.
Table 3- 3
Possible states of the LINK and RX/TX LEDs
LED
Meaning
LINK
RX/TX
Lit
Irrelevant
Connection at the PROFINET IO interface is active
Irrelevant
Flashes
6 Hz
Receiving or sending data at the PROFINET IO interface.
Note
The LINK and RX/TX LEDs are located directly next to the sockets of the PROFINET IO
interfaces. They are not labeled.
REDF LED
The REDF LED indicates specific system states and redundancy errors.
REDF LED
System state
Basic requirements
Flashes
0.5 Hz
Link-up
-
Flashes
2 Hz
Update
-
Dark
Redundant (CPUs are redundant)
No redundancy error
Lit
Redundant (CPUs are redundant)
There is an I/O redundancy error:
•
Failure of a DP master, or partial or total failure of a
DP master system
•
Failure of a PN IO subsystem
•
Loss of redundancy on the DP slave
•
Loss of redundancy at the PN IO device
•
Loss of redundancy on the DP slave/slave failure
•
Loss of redundancy at the PN IO device/device
failure
