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Operating Instructions
Chapter
9
UE4155
8010178/TF82/2010-03-05
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
47
Subject to change without notice
Fault diagnosis
9.3
Error displays of the LEDs
This chapter explains the meaning of the error displays of the LEDs and how to respond.
Please refer to section “Status indicators” on page 15 for a description.
Display
Possible cause
Remedying the error
No voltage supply
Check the voltage supply and
activate, if necessary.
U
L
Red
Internal voltage supply too
low or
firmware is being updated
Check the voltage supply if
necessary.
PROFIBUS communication
has been established with
the FPLC, but the safety
communication is still
inactive. The FPLC safety
program has not yet been
started.
Ensure that a PROFIsafe master
has been deployed.
Check the status of the safety
program.
Green
Acknowledgement by user
mandatory. The FPLC has
detected an error on the
side of the bus node and
has deactivated the bus
node.
Check the bus-node PROFIBUS
diagnostics data.
Resolve any errors.
Then acknowledge that the error
has been remedied.
Red
General PROFIBUS error,
no communication is
possible
Check the PROFIBUS connecting
cable.
Check that the PROFIBUS address
corresponds to that in the FPLC
and on the bus node.
BUS
Red
Not a valid PROFIBUS
configuration
Check that the PROFIsafe
addresses correspond to those in
the FPLC and on the bus node.
Tab. 13: Error displays of the
LEDs