Mitsubishi L Series User Manual page 113

(1) Concept of integral processing
With this function, integral processing is performed using the following formula.
Integrated flow amount = (Instantaneous flow amount
Item
Integrated flow This is a result of the integral processing. The integrated flow amount is stored in CH
amount (Un\G1332 to Un\G1339) in the range of 0 to 2147483647.
Instantaneous This is an instantaneous flow amount value output in analog from the flow meter. In this function, the value stored in
flow amount CH Scaling value (digital operation value) (Un\G54 to Un\G57) as the instantaneous flow amount.
This is an integration cycle (ms) set in CH
to the output cycle of the flow meter connected to the A/D converter module.
T
Ex. When the flow meter outputs instantaneous flow amount in analog at intervals of 500ms, set 500.
This is a conversion value to convert the time unit of instantaneous flow amount to ms. Set this value in CH
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
Range of flow
meter
T
/min
Ex.
When the range of the flow meter is cm
This is unit scaling of the integrated flow amount. Set this valule in CH
This is used when the value of instantaneous flow amount ×
The following table lists the values of unit scaling for CH
Unit scaling
Ex. When the value of
Set × 1000 (3) or × 10000 (4).
Previous amount This is a value stored in CH
● 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
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
value exceeds the upper limit (2147483647), the excessive part is stored in CH
Un\G1339).
Ex. 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
Integration cycle setting (Un\G1308 to Un\G1311). Set this cycle according
Setting value of CH
/s
/h
3
Setting value of CH Unit scaling setting (Un\G1324 to Un\G1327)
T/T is 0.0083...( T=500(ms), T=60000(ms))
Integrated flow amount (Un\G1332 to Un\G1339) before integral processing.
T
Unit scaling)
T
Description
Flow amount time unit setting (Un\G1316 to Un\G1319).
Flow amount time unit setting
(Un\G1316 to Un\G1319)
0
1
2
/s, set /s (0).
Unit scaling setting (Un\G1324 to Un\G1327).
T/T is 0 to 1.
Unit scaling setting (Un\G1324 to Un\G1327).
0
1
2
3
4
Integrated flow amount (Un\G1332 to Un\G1339). If the
Integrated flow amount (Un\G1332 to Un\G1339).
CHAPTER 8 FUNCTIONS
+ Previous amount
Integrated flow amount
Flow
T (ms)
1000
60000
3600000
Unit scaling
1
10
100
1000
10000
Integrated flow amount (Un\G1332 to
Integrated flow amount (Un\G1332 to
111
8