S5-100U The Integral Real-Time Clock
Tables 12-5 through 12-8 provide you with information about the significance of the signal states of
the respective flags.
Clock Flags
Table 12-5. Significance of Bits 0, 1, 2 and 3 of the Status Word
Bit Number Signal State Meaning
0
1 Error in setting entry
0
1
0
1
No error in setting entry
12-hour clock mode
24-hour clock mode
1
0
2
Transfer settings
Do not transfer settings
1
0
3
The clock time can be read
The clock time cannot be read
Operating System Flags
Table 12-6. Significance of Bits 4 and 5 of the Status Word
STOP 4 1
5 1 Words 18 to 21 contain the time at which the last RUN to
STOP switch occurred or the time at which the last
Power OFF occurred if bit 4 is also set.
0
The clock updates only words 0 to 3 (current time/date) in
the clock data area. You can set the clock by using the
FORCE VAR programmer function.
Words 18 to 21 are not used. 0
RUN 4 1/0 The clock continually updates the clock data area
(Words 0 to 17).
5 1 Words 18 to 21 contain the time at which the last switch
from RUN to STOP occurred or the time at which the last
Power OFF occurred.
Words 18 to 21 are not used.0
The clock does not update the clock data area. Words 0
to 3 contain the time at which the last switch from RUN to
STOP occurred.
Operating
Mode
Bit Number
Status
Word
Signal
State
Meaning
EWA 4NEB 812 6120-02
12-13
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