Siemens S5-100U User Manual page 312

The Integral Real-Time Clock
STL
OB 21
JU FB 1
NAME: CLOCK
BE
STL
OB 22
JU FB 1
NAME: CLOCK
BE
STL
DB 75
0: KH = 0000;
1: KH = 0000;
2: KH = 0000;
3: KH = 0000;
4: KH = 0000;
5: KH = 0000;
6: KH = 0000;
7: KH = 0000
12-18
Table 12-11. OB21 Program
The function block is called up once during a switch from STOP to
RUN.
Table 12-12. OB22 Program
The function block is called up once when the programmable
controller is switched on.
Table 12-13. DB75 Program
Define the number of data words. (Data words 0 to 7 are used in
the example. See Table 12-3) . Define the numerical
representation. Hex is used in the examples.
Explanation
Explanation
Explanation
S5-100U
EWA 4NEB 812 6120-02