Operating Instructions
Chapter
9
UE4155
8010178/TF82/2010-03-05
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
53
Subject to change without notice
Fault diagnosis
9.6.2
Error in connected components
When the bus node recognizes an error in a connected component, e.g. a device error on
the SDL connection or a sensor error on a field signal connection, the behaviour of the bus
node depends on its firmware version (see type label).
Program an error acknowledgement!
Ensure that the FPLC program uses error acknowledgement. The FPLC program may not
acknowledge the error until it has been resolved.
Firmware version of
the bus node
How does the bus node respond?
When is the error information
deleted?
<
1.05
The bus node transmits
failsafe safety information to
the FPLC, i.e. the
corresponding bits in the
process image are set to
logical "0".
The bus node sets the error
status bit of the PROFIsafe
message and deactivates
the whole process image
(the bus node is kept in a
passive state).
The bus node generates a
PROFIBUS diagnosis
message.
The bus node deletes the error-
status information and the
PROFIBUS diagnostic message
automatically, as soon as the
error has been resolved. Valid
I/O data in the process image
are then again sent to the
FPLC.
1.05
The bus node remains
operational.
The bus node transmits
failsafe status information to
the FPLC, i.e. it sets the bits
corresponding to the input in
the process image to “0“.
The bus node generates a
PROFIBUS diagnosis
message.
The bus node deletes the error-
status information and the
PROFIBUS diagnostic message
automatically, as soon as the
error has been resolved. Valid
I/O data in the process image
are then again sent to the
FPLC.
WARNING
Tab. 16: Response of the bus
node in the event of errors of
connected components
