Deactivating Safety Mode - Siemens SIMATIC S7 Configuration And Programming Manual

1.2.18

Deactivating Safety Mode

Safety operating mode/evaluating deactivated safety mode
If you wish to evaluate the safety operating mode or deactivated safety mode in the
safety program, you can evaluate the "MODE" tag in the F-shared DB
(1 = deactivated safety mode).
These tags are accessed fully qualified ("F_GLOBDB".MODE). The number and
symbolic name of the F-shared DB and the absolute address of the tags are
indicated in the printout of the safety program.
You can use this, for example, to passivate F I/Os when the safety program is in
the deactivated safety mode. To do this, assign the "MODE" tag in the F-shared
DB to all "PASS_ON" tags in the F I/O DBs of the F I/Os that you wish to passivate.
Safety Note
!
When the safety program is in the deactivated safety mode, the evaluation of the
"MODE" tag in the F-shared DB is performed in deactivated safety mode.
Even when the F I/O in the deactivated safety mode is passivated by the
evaluation of the "MODE" tag, due to the deactivated safety mode the safety of
the plant must be ensured by other organizational measures, such as monitored
operation and manual safety shutdown.
Please refer to the safety note in the manual, Chapter 5.9.1.
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
A5E00169432-02
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