System Function Blocks - Siemens CPU 412-1 Instruction Manual

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).
SFC
SFC Name
No.
0 CTU Count up
1 CTD Count down
2 CTUD Count up and down
3 TP Generate pulse
4 TON Generate on-delay
5 TOF Generate off-delay
8 USEND Send data without coordination
(one send parameter supplied)
JOB activated (1 - 440 bytes)
JOB checked
JOB finished (DONE = 1)
S7-400 Instruction List
A5E00267845-01
Function
4
4
4
26
25
19
426 -
448
147
147
Execution Time in ms
CPU CPU CPU
412 414 416
3 1
2 1
2 1
15 10
15 10
11 7
245 - 164 -
260 174
86 57
84 56
System Function Blocks
CPU CPUs CPUs
417 414-4H 414-4H
417-4H 417-4H
(solo) (redun-
dant)
1 xx xx
1 xx xx
1 xx xx
8 xx xx
8 xx xx
6 xx xx
139 - xx - xx xx - xx
153
49 xx xx
48 xx xx
139