System Function Blocks
139
S7-400 Instruction List
A5E00267845-01
System Function Blocks
The following table lists the system function blocks provided with the operating system of the S7-400 CPUs as well as the execution times
of the individual CPUs (X: function exists, execution times were not available when manual was printed).
Execution Time in s
SFC
No.
SFC Name Function
CPU
412
CPU
414
CPU
416
CPU
417
CPUs
414-4H
417-4H
(solo)
CPUs
414-4H
417-4H
(redun-
dant)
0 CTU Count up 4 3 1 1 xx xx
1 CTD Count down 4 2 1 1 xx xx
2 CTUD Count up and down 4 2 1 1 xx xx
3 TP Generate pulse 26 15 10 8 xx xx
4 TON Generate on-delay 25 15 10 8 xx xx
5 TOF Generate off-delay 19 11 7 6 xx xx
8 USEND Send data without coordination
(one send parameter supplied)
JOB activated (1 - 440 bytes)
426 -
448
245 -
260
164 -
174
139 -
153
xx - xx xx - xx
JOB checked 147 86 57 49 xx xx
JOB finished (DONE = 1) 147 84 56 48 xx xx
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