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S5-115U Manual
13.5
Programming the Integral Clock
Transferring Settings to the Clock
•
Settings are stored in the clock data area with Transfer operations (cf. Table 13-3).
•
The AM/PM flag (bit No. 7) is only significant in 12-hour mode.
Bit 7=1 PM
Bit 7=0 AM
•
Clock data must be transferred in BCD.
Note
The "KC" data format loads a BCD constant into ACCUM 1 and is therefore especially
suitable for entering clock settings.
•
If a setting is not to be transferred, identify the corresponding byte with the number "255
or "FF
". The value of this variable in the clock is then retained when the clock is set.
H
•
Once you have transferred the settings to the clock data area, you must set bit 2 of the status
word before the clock can accept the clock data.
•
Incorrect settings are flagged in the status word by setting bit 0. The clock continues to ope-
rate with old values.
Example:
Transferring new settings (clock time/date) to the clock, using the programmer.
Setting the clock with the following data: Tue 01.03.88; 12.00.00. The status word is assigned to
flag word 10 and the clock data is stored in DB2 from data word 0. The settings for the clock data
are transferred:
•
With the "FORCE VAR" programmer function if the PC is in RUN Mode
•
With the "FORCE VAR" programmer function if the PC is in "STOP" mode and status word
bit 4=1.
Note
When using the "FORCE VAR" function, you must enter the clock data first and then
the status word.
EWA 4NEB 811 6130-02b
Integral Real-Time Clock
"
D
13-13
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