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CHAPTER 8 FUNCTIONS
8
8.15 Flow Amount Integration Function
(1) Concept of integral processing
With this function, integral processing is performed using the following formula.
● If the instantaneous flow amount is less than 0, integral processing is not performed.
● The value acquired by rounding off the part after the decimal point is stored in CH Integrated flow amount (Un\G1332 to
Un\G1339). (Inside the A/D converter module, calculation is performed including the value after the decimal point in
integral processing.)
● The value within the range of 0 to 2147483647 is stored in CH Integrated flow amount (Un\G1332 to Un\G1339). If the
value exceeds the upper limit (2147483647), the excessive part is stored in CH Integrated flow amount (Un\G1332 to
Un\G1339).
When the previous amount is 2147483000 and the present amount (Instantaneous flow amount × Unit scaling ×
T/T) is 5000,
(2147483000 + 5000) - 2147483647 = 4353 is stored in CH Integrated flow amount (Un\G1332 to Un\G1339).
Item Description
Integrated flow
amount
This is a result of the integral processing. The integrated flow amount is stored in CH Integrated flow amount
(Un\G1332 to Un\G1339) in the range of 0 to 2147483647.
Instantaneous
flow amount
This is an instantaneous flow amount value output in analog from the flow meter. In this function, the value stored in
CH Scaling value (digital operation value) (Un\G54 to Un\G57) as the instantaneous flow amount.
T
This is an integration cycle (ms) set in CH Integration cycle setting (Un\G1308 to Un\G1311). Set this cycle according
to the output cycle of the flow meter connected to the A/D converter module.
When the flow meter outputs instantaneous flow amount in analog at intervals of 500ms, set 500.
T
This is a conversion value to convert the time unit of instantaneous flow amount to ms. Set this value in CH Flow
amount time unit setting (Un\G1316 to Un\G1319). Set this cycle according to the range of the flow meter connected to
the A/D converter module.
The following table lists the values of T for CH Flow amount time unit setting (Un\G1316 to Un\G1319).
Range of flow
meter
Setting value of CH Flow amount time unit setting
(Un\G1316 to Un\G1319)
T (ms)
/s 0 1000
/min 1 60000
/h 2 3600000
When the range of the flow meter is cm
3
/s, set /s (0).
Unit scaling
This is unit scaling of the integrated flow amount. Set this valule in CH Unit scaling setting (Un\G1324 to Un\G1327).
This is used when the value of instantaneous flow amount × T/T is 0 to 1.
The following table lists the values of unit scaling for CH Unit scaling setting (Un\G1324 to Un\G1327).
Setting value of CH Unit scaling setting (Un\G1324 to Un\G1327) Unit scaling
01
110
2 100
3 1000
4 10000
When the value of T/T is 0.0083...( T=500(ms), T=60000(ms))
Set × 1000 (3) or × 10000 (4).
Previous amount This is a value stored in CH Integrated flow amount (Un\G1332 to Un\G1339) before integral processing.
Integrated flow amount = (Instantaneous flow amount Unit scaling) Previous amount
T
T
+
Ex.
Ex.
Ex.
Ex.
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