3.8
F-runtime groups
3.8.1
Rules for F-Runtime Groups of the Safety Program
Rules
Note the following:
● The channels (channel values and value status) of an F-I/O can only be accessed from a
single F-runtime group.
● Tags of the F‑I/O DB of an F‑I/O can only be accessed from one F‑runtime group and only
from that F‑runtime group from which the channels or value status of this F‑I/O are also
accessed (if access is made).
● F-FBs can be used in more than one F-runtime group but they must be called with different
instance DBs.
● Instance DBs of F-FB can only be accessed from the F‑runtime group in which the
associated F‑FB is called.
● It is only permissible to access a variable of a global F‑DB from an F-runtime group.
However, it is permissible to use a global F-DB in several F-runtime groups.
● It is not permissible that you call the main safety block. It is automatically called by the
assigned F-OB.
Note
F-OBs are protected by F-system know-how. The OB start information of F-OBs therefore
cannot be evaluated.
● The F-OB should be created with the highest priority of all OBs.
Note
The cycle time of the F-OB can be prolonged by, among other things, communication load,
the processing of higher-priority interrupts, as well as by test and commissioning functions.
● The process image of the inputs and outputs of the standard I/O, bit memories and variables
of DBs of the standard user program may be read or write accessed from several F-runtime
groups.
● F-FCs can generally be called in more than one F-runtime group.
Safety program of the F-PLC
3.8 F-runtime groups
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
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