IDEC MICROSmart FC6A Series Ladder Programming Manual page 566

27: F C
LOW ALCULATION
Function Descriptions
■ Flow Rate Function
Starting the Flow Rate Calculation
This section describes the operation from turning on the input to starting the flow rate calculation.
Input
Enable totalizer input (S2)
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 on, the flow volume work area and the flow rate (D1+0, D1+1) are 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 increased is added to the flow volume work area with each scan.
(3) When the enable totalizer input is on, the flow volume is calculated from the flow volume work area each second and stored
in the flow rate.
The flow rate calculation is executed at a cycle of 1 second regardless of whether the log execution input (S3) is turned on
or off.
(4) (2) and (3) are then repeated.
Note: The flow rate formula is as follows.
Flow volume work area
Flow rate =
T has the following values depending on the set flow rate unit.
T (s) = 1
T (min) = 60
T (hour) = 60×60 = 360
T (day) = 60×60×24 = 8,640
27-20
I
NSTRUCTIONS
ON
OFF
(1)
ON
OFF
(2) (3)
Flow rate Flow rate Flow rate
update cycle update cycle update cycle
1 s
×T
K factor
FC6A S MICROS
ERIES MART
(4)
L P M
ADDER ROGRAMMING ANUAL
FC9Y-B1726