S5-100U The Integral Real-Time Clock
When you set the clock, you have to transfer only the data needed to implement a particular
function. For example, if you want to change only the clock function data, you do not have to enter
data for the time prompt function or for the operating hours counter.
The clock data area has the same structure wherever it is located: in the data block area, the flag
area, the input area, or the output area. Table 12-3 provides you with information about where
specific clock data is located within the clock data area. The explanations for Table 12.3 follow the
table.
Table 12-3. Clock Data in the Clock Data Area
* Relevant when programming the clock in the user program (see Table 12-4)
** Significant only in the 12-hour mode Bit 7=1 means PM, bit 7=0 means AM
4
3
---
---
Hours · 100
---
Minute
Hours · 100
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Clock time/date after
a switch from RUN to
STOP or Power OFF
(only if bit 5 in the
status word = 1)
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Settings for
operating hours
counter
Current operating
hours
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Time prompt
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Settings for clock
time/date
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Current clock
time/date
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2
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Left Flag Word
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Meaning
---
Day
Year
Minute
Leap year*
Year
Minute
Day
---
---
Day
Minutes
Minutes
Year
Minute
Day
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Right Flag Word
Second
Second
Hours · 10,000
Second
Second
Second
Weekday
Hours · 10,000
Second
Month
AM/PM (Bit 7) Hour
Hour
Hours
Weekday
AM/PM (Bit 7)** Hour
Month
AM/PM (Bit 7)**Hour
Month
Weekday
AM/PM (Bit 7)** Hour
Month
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Clock Data
Area
(Data Word)
0 Weekday
EWA 4NEB 812 6120-02
12-9
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