Siemens SIMATIC S7 System Manual page 121

Block Container
F-user blocks
F-control blocks
F-simulation blocks
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
7.4 Structure of Safety Program in S7 F/FH Systems
... Contains F-Blocks
F-system blocks
F_S_BO, F_S_R
•
F_S_BO, F_S_R
•
F_START
•
F_PSG_M
•
Communication
F_SENDBO, F_SENDR
•
F_RCVBO, F_RCVR
•
Mathematical standard functions
F_CYC_CO
•
F_M_AI6
•
F_M_DI24
•
F_M_DI8
•
F_M_DO10
•
F_M_DO8
•
F_PLK
•
F_PLK_O
•
F_SHUTDN
•
F_CHG_WS
•
...
•
Simulation blocks
Programming F-Systems
Function
Communication between F-runtime
groups
Signals a cold start or a restart (warm
restart)
Division in selective runtime groups
F-blocks for safety-related
CPU-CPU communication
F-blocks for mathematical standard
functions such as arithmetic, logic,
multiplexing, etc.
Block container containing F-blocks
that are called and inserted by
Systems
when the safety program is
compiled, in order to generate an
executable safety program from the
user's safety program.
The user must not insert F-blocks of
the F-control block in the safety
program. Likewise, the F-blocks must
not be modified (renamed) or deleted
in the Failsafe Blocks
F-library (V1_2)
or the block container of the user
project.
During offline simulation with
the F-blocks of the safety program are
overwritten by identically-named
simulation blocks from the
Blocks
F-library (V1_2). These
F-blocks are suitable for simulation
purposes only and must not be
downloaded to the F-CPU.
S7 F
PLCSim
,
Failsafe
7-11