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Chapter III General Description of Function Blocks
USER'S MANUAL
8. Clock hold circuit
For a FAB2, when there is a power failure, the internal clock will continue
running. The time that the FAB2 can maintain the internal clock to run depends
on the temperature. When the temperature of the FAB2 is 25
℃
, the clock is able
to continue its normal operation for more than 160 hours after the power is cut
off.
9. Conflicts between time intervals
When time intervals are used to set the ON/OFF time of a clock, the clock switch
will make the output ON at the ON time unless it has already been ON status,
and make the output OFF at the OFF time unless it has already been OFF status.
10.Accuracy of a RTC (Real Time Clock)
The accuracy of a RTC can reach 1s. Only one FB (Function Block) is needed
to do the work with duration of less than one minute. This function is applicable
to the controls related to time, e.g. ringing bell for classes in school and work in
factories, timed start-up and shutdown of machines, etc.
3.2.5 RS
Line diagram/Symb
ol in FAB2
Pin
Description
Input S
Set Output Q to 1 via Input S (Set). S
port can receive two-tone signal input
such as P0~P9 phone signals.
Input R
Set Output Q to 0 via Input R (Reset).
If S and R are 1 at the same time,
the Output Q is 0 (with R having a
priority to S).
Output Q
When S is input, Q is ON and held
ON, and will not be reset until Input
R is set.
R
S
K1
K1
RS
S
R
Q
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Summary of Contents for AF-10MR-A2
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