LED Color State Description, cause Remedy
OPT
(OPTION)
– Off Electronics power supply is missing or outside per‐
missible tolerance range.
Component is not ready.
Option board not installed or no associated drive
object has been created.
Check power supply and/or
component
Green Continu‐
ous light
Option Board is ready. –
Flashing
light
0.5 Hz
Depends on the option board used. –
Red Flashing
light
2 Hz
At least one fault is present on this component.
Option Board not ready (e.g. after switch-on).
Remove the fault and ac‐
knowledge
RDY and PN Red Flashing
light
2 Hz
Bus fault – communication has been interrupted Correct the fault
RDY and OPT Orange Flashing
light
0.5 Hz
Firmware update in progress for connected Option
Board CBE20.
–
Status displays of Ethernet interfaces
The RJ45 sockets are equipped with one green and one yellow LED. As a consequence, the
following information of the PLC I/O interface is displayed based on PROFINET and the LAN
interface:
Name Color State Meaning
Link Green Continuous
light
10 or 100 Mbit link available
Off Missing or faulty link
Activity Yellow Flashing
light
Sending or receiving data
Off No activity
Service cases - hardware
4.9 Control Unit CU320-2 PN and CU310-2 PN
Software and hardware
126 Service Manual, 08/2018, 6FC5397-5DP40-6BA1
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