S5-100U The Integral Real-Time Clock
The Block Entry Sequence and a Programming Example:
The following procedure is suggested:
1. Program FB1 - Defining system data for the integral real-time clock
2. Program OB21 - Calling up FB1 during a change from STOP to RUN
3. Program OB22 - Calling up FB1 when the programmable controller is switched on
4. Generate DB75 - Storing clock data
5. Transfer new data to the clock using the FORCE VAR programmer function (programmable
controller in the RUN mode) .
The respective programming examples are shown in Tables 12-10 to 12-14.
Table 12-10. FB1 Program
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STL Meaning Explanation
FB 1
NAME: CLOCK
L KH 4 4 4 B
T RS 8
L KH 0 0 4 D
T RS 9
L KH 0 C 0 0
T RS 10
BE
ASCII Code for the “D” character
Block number “75
D
”
Storing in system data word 8
DW0 is the start address for clock data
ASCII Code for the “M” Character
Storing in system data word 9
Flag word Number “12
D
”
ASCII Code is irrelevant
Storing in system data word 10
Clock data is
located in
DB75
beginning
with DW0
The status
word is
located in
FW12
EWA 4NEB 812 6120-02
12-17
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