IDEC MICROSmart FC6A Series Ladder Programming Manual page 567

Pausing the Flow Rate Calculation
This section describes the operation from turning on the input to pausing the flow rate calculation.
ON
Input
OFF
ON
Enable totalizer input (S2)
OFF
Flow counter
(S1+0, S1+1)
Flow volume work area
(D1+8, D1+9)
Flow rate
(D1+0, D1+1)
(1) If the enable totalizer input (S2) is turned off, the flow rate is initialized to "0".
(2) If the enable totalizer input (S2) is turned on, sampling of the flow counter (S1+0, S1+1) starts, and the amount that the
flow counter (S1) increased is added to the flow volume work area with each scan. The processing is the same as (2) in
"Starting the Flow Rate Calculation" on page 27-20.
(3) 1 second after the enable totalizer input is turned on, the flow rate is calculated from the flow volume work area and stored
in the flow rate (D1+0, D1+1).
Regardless of whether or not the log execution input (S3) is on or off, the flow rate is calculated in a 1 second cycle (the
processing is the same as (3) in "Starting the Flow Rate Calculation" on page 27-20).
(4) (2) and (3) are then repeated.
Ending the Flow Rate Calculation
This section describes the operation to end the flow rate calculation.
ON
Input
OFF
ON
Enable totalizer input (S2)
OFF
Flow counter
(S1+0, S1+1)
Flow volume work area
(D1+8, D1+9)
Flow rate
(D1+0, D1+1)
(1) If the input is turned off when the enable totalizer input (S2) is on, the flow volume work area and flow rate are initialized to
"0" and the instruction ends.
(2) If the input is turned on when the enable totalizer input is on, the flow rate calculation starts.
(3) If the enable totalizer input is turned off, the flow rate is initialized to "0" and the flow rate calculation is paused (the
processing is the same as (1) in "Pausing the Flow Rate Calculation" on page 27-21).
(4) If the input is turned off, the flow volume work area and the flow rate (D1+0, D1+1) are initialized to "0" and the instruction
ends.
(1)
Flow rate Flow rate Flow rate
update cycle update cycle update cycle
1 s
(1)
Flow rate Flow rate Flow rate
update cycle update cycle update cycle
1 s
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(2) (3)
(2) (3)
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ADDER ROGRAMMING ANUAL
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LOW ALCULATION
(4)
(4)
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27-21