Table 4-7 Meaning of the Sync and Fault LEDs on the CBE20
LED Color Status Description
Fault – Off If the link port LED is green:
The CBE20 is operating error-free. Data is being exchanged with the configured IO
controller.
Red Flashing
light
Possible cause:
● The response monitoring interval has elapsed.
● Communications is interrupted.
● The IP address is incorrect.
● Incorrect or no configuration.
● Incorrect parameter settings.
● Incorrect or missing device name.
● IO Controller not connected/switched off, although an Ethernet connection has
been established.
● Other CBE20 faults
Continu‐
ous light
CBE20 fault error
● No physical connection to a subnet/switch.
● Incorrect transmission rate
● Full duplex transmission is not activated.
Sync – Off If the link port LED is green:
The Control Unit task system is not synchronized with the IRT clock. An internal sub‐
stitute clock is generated.
Green Flashing
light
The Control Unit task system has synchronized with the IRT clock and data is being
exchanged.
Continu‐
ous light
The Task system and the MC-PLL have synchronized with the IRT clock.
Option Boards
4.2 Communication Board Ethernet CBE20
Supplementary component descriptions
52 Manual, 06/2019
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