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Chapter 7 Usage of Various Functions
7-43
3) Parameter setting
(1) Scaling function
This function convert automatically range when the inout/output range is not matched.
In case that input/output is current , this function is useful that external equapment’ range is not matched each other.
(MASTER-K120S series converts range automatically as following : 0 ~ 20mA 4 ~ 20mA)
Conversion method is as below
• scaling conversion value (A/D conversion) = [(data of 0 ~ 20 ) – 800] x 4000/3200
example) in case of 8 input at range 0 ~ 20
before the scaling conversion : 8 / 5 = 1600
after the scaling conversion : (1600 –800) x 1.25 = 1000
• scaling conversion value (D/A conversion) = [(data of 4 ~ 20 ) x 3200/4000] + 800
example) in case of ‘1000’ output at range 4 ~ 20
current output value before the scaling conversion : 1000 x 5 = 5
current output value after the scaling conversion : (1000 x 0.8) + 800 = 1600
1600 x 5 = 8
Resolution : 20 /4000 = 5
Resolution : 20 /3200 = 6.25