easy-forum
Deutsch - Software => Galileo => Thema gestartet von: srd am Oktober 16, 2020, 11:01:38 Vormittag
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using a 4-20ma / 6m transducer to show tank level how do a do the scaling to show meters with a decimal point. Scaling would be 819 = 0.0m, 4095 =6.0m
My apologies i was after info to put it on an xv102 easy screen
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Hello srd,
here's the possible solution.
Greetz,
Konni
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My apologies i was after doing it on an xv102 easy hmi screen
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Okay, so we need a Galileo solution.
You have to add a value conversion to the value display object.
I call the conversion group "Measures" and added a conversion called "TankLevelConversion".
The converion type is MMI=PLC*a/b+c
The calculation (Incs = value of the AD-Converter):
(4095 Incs - 819 Incs) / 600 cm = 5,46 Incs/cm (factor)
Because we can't use floating point values for calculation I multiplied PLC Incs and factor with 1000 to get an exact result within the following integer division.
819 Incs / 5,46 Incs/cm = 150 cm (the level offset because of 4 mA)
So I have to subtract 150 cm off the result.
MMI= (TankLevel * 1000 / 5460) + (-150) [cm] -> Decimal point = 2 -> [m]
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Cheers for showing me that i will give it a try. Much appriciated.