Siemens SIMATIC S7 F Manual page 331

Fail-Safe Blocks
Block Block
Name Number
F_R_R FB 393
F_R_TRIG FB 346
F_RCVBO FB 371
F_RCVR FB 373
F_RS_FF FB 307
F_S_BO FB 390
F_S_R FB 392
F_SENDBO FB 370
F_SENDR FB 372
F_SHUTDN FB 458
F_SMP_AV FB 333
F_SQRT FB 330
F_SR_FF FB 308
F_START FB 394
F_SUB_R FB 322
F_TEST FB 398
F_TESTC FB 399
F_TESTM FB 400
F_TI_FTI FB 368
F_TOF FB 344
F_TON FB 343
F_TP FB 342
F_XOR2 FB 303
F_XOUTY FB 306
DB_INIT FC 180
DB_RES FC 301
FAIL_MSG FC 181
RTG_LOGIC FB 459
Run times of F block types
For a first estimate, add the run times of the called blocks. An exact run time can
only be obtained by measurement.
Fail-Safe Systems
A5E00085588-03
Function
Fail-safe receipt of 5 data items of the data type F_REAL
from another F-run-time group
Detection of the rising edge
Receives F_BOOL data from another CPU
Receives F_REAL data from another CPU
RS flipflop, resetting dominant
Fail-safe transmission of 10 data items of the data type
F_BOOL to another F run-time group.
Fail-safe transmission of 5 data items of the data type F_
to another F run-time group
Sends F_BOOL data to another CPU
Sends F_REAL data to another CPU
F Run-time group shutdown and restart management
Sliding mean value
Calculation of the square root
SR flipflop, setting dominant
Startup detection (cold restart or warm restart)
Subtraction of two REAL values
Self-test for commands not backed up by diversity
Control block for the background self-test of the CPU
Switching of Safety Mode on and off
Converts from TIME to F_TIME
Timer off-delay
Timer on-delay
Timer pulse
XOR logic operation on two inputs
Binary selection X out of Y
F-run-time group coldstart initialization logic
Supports the startup characteristics in the event of a cold
restart/warm restart of the CPU
F-run-time group shutdown diagnostic error reporting
F-run-time group shutdown and restart logic interface
Maximum Run
Time with
Dynamically
Connected Inputs
V
in
40
13
1250
770
16
12
12
1320
1420
21
391
58
16
11
16
362
445
178
12
24
24
24
13
74
11
To be supplied
Included in
RTG_LOGIC
12
8-143