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User manual IC220SDL953 - September 2011
GFK-2731
8.6
Acknowledging an error
In the VersaSafe system, the errors of the IC220SDL953 as well as those of the corre-
sponding island satellites must be acknowledged via the IC220SDL953.
After removing the cause of an error, the diagnostic message must be acknowledged. To
do this, set the corresponding bit in the "Dev-Ackn-LPSDO" register (see "App-Diag-
LPSDO (application diagnostics)" on page A-19).
If in the event of failure the safety module is replaced, please proceed as described in
Section 4, "Assembly, removal, and electrical installation" and "Restart after replacing a
WARNING: Acknowledgment may result in a hazardous system state
With the exception of a few special cases, the acknowledgment of an error immediately
returns the safe input or output to the operating state. Before acknowledging an error you
must, therefore, make sure that the acknowledgment will not cause the machine to
switch to a dangerous state.
When planning the machine or system, make sure that acknowledgment is only possible
if the danger zone is visible.