System Functions
106
S7-400 Instruction List
A5E00267845-01
System Functions
The following tables show the system functions which are provided by the operating system of the S7-400 CPUs and the execution times
for the various CPUs. (X: function available, execution times not yet available before printing).
Execution Time in
s
SFC
No.
SFC Name
Function
CPU
412
CPU
414
CPU
416
CPU
417
CPU
414-4H
417-4H
(solo)
CPU
414-4H
417-4H
(redun-
dant)
0
SET_CLK
Set clock
195
111
75
66
xx
xx
1
READ_CLK
Read clock
31
18
13
10
xx
xx
2
SET_RTM
Set run-time meter
27
16
11
9
xx
xx
3
CTRL_RTM
Start and stop run-time meter
23
14
10
8
xx
xx
4
READ_RTM
Read run-time meter
29
18
12
10
xx
xx
5
GADR_LGC
Find logical address of a channel
Rack 0
38
23
15
13
xx
xx
internal DP
51
31
21
18
xx
xx
6
RD_SINFO
Read start information of current OB
33
20
14
11
xx
xx
7
DP_PRAL
Trigger a process interrupt at the DP
master
First call
275
170
113
106
––
––
Intermediate call
25
15
10
8
--
--
Last call
25
15
10
8
--
--