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