Siemens SIMATIC S7-300 Series Reference Manual page 152

CPU Function, depending on CPU and STEP 7 Version
Function
Block
SFC 100*
SFC 105*
SFC 106
SFC 107
SFC 108
* MODE 0:
Depending on the size of the target area SYS_INST and the number of
system resources still to be fetched.
MODE 1 and 2:
Depends on the number of active messages (occupied system resources).
MODE 3:
Depends on the number of active messages (occupied system resources) and
the number of instances used with the CMP_ID to be found.
4-10
Application
Setting TOD and TOD Status
Reading dynamic system
resources
Releasing dynamic system
resources resources
Creating block related messages
including an acknowledgement
function
Creating block related messages
without acknowledgement function
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
Execution time See...
in ms
MODE 1 274 Online help
Standard
MODE 2 84
and
MODE 3 275
System-
functions in
STEP 7
MODE 0 117-1832
MODE 1 138-2098
MODE 2 139-1483
MODE 3 140-2128
MODE 1 123-1376
MODE 2 MODE 2 126-1334 126-1334
MODE 3 125-1407
Initial call 257
Empty call 101
Initial call 271
Empty call 115
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