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Can anyone tell me if Codesys V3 has the ability for scaling and unscaling analog signals? Do anyone have a good example for working within CodeSys with analog signals as newbie? In TIA Portal we have function blocks, do CodeSys also have one?
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There are a lot of function blocks out there. A standard one is LIN_TRAFO but has some downfalls in my opinion. A good starting point none the less. For an example I would look in the help. If you go to Help-Index and search LIN_TRAFO it will give you everything you need to know. You can just map your inputs and scale values and you are set.
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For example your analog sensor reads 8000 (assuming some range between 0 and 32767), and this range represents a temperature value of 0 to 100 *C. You should set up your function block, where:
diInput is whatever raw value you have
diInputMin is 0
diInputMax is 32767
diOutputMin is 0
diOutputMax is 100
diScaledOutput should yield 24
If you need decimal point, then multiply all inputs by 10, then divide by 10 at the very end and change your output from DINT to REAL
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Can anyone tell me if Codesys V3 has the ability for scaling and unscaling analog signals? Do anyone have a good example for working within CodeSys with analog signals as newbie? In TIA Portal we have function blocks, do CodeSys also have one?
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There are a lot of function blocks out there. A standard one is LIN_TRAFO but has some downfalls in my opinion. A good starting point none the less. For an example I would look in the help. If you go to Help-Index and search LIN_TRAFO it will give you everything you need to know. You can just map your inputs and scale values and you are set.
You can certainly write your own scaling function...assuming you just started Codesys:
Create a function block and give it a name called Scale. Copy this part to the top
FUNCTION_BLOCK Scale
VAR_INPUT
xEN : BOOL; ( enable )
diInput : DINT; ( raw digital input )
diInputMin : DINT; ( minimum value expected )
diInputMax : DINT; ( maximum value expected )
diOutputMin : DINT; ( minimum scaled output )
diOutputMax : DINT; ( maximum scaled output )
END_VAR
VAR_OUTPUT
xENO : BOOL; ( running )
diScaledOutput : DINT; ( scaled output )
END_VAR
Now copy this part to the bottom half of screen
diScaledOutput := (diInput-diInputMin)*(diOutputMax-diOutputMin)/(diInputMax-diInputMin)+ diOutputMin;
For example your analog sensor reads 8000 (assuming some range between 0 and 32767), and this range represents a temperature value of 0 to 100 *C. You should set up your function block, where:
diInput is whatever raw value you have
diInputMin is 0
diInputMax is 32767
diOutputMin is 0
diOutputMax is 100
diScaledOutput should yield 24
If you need decimal point, then multiply all inputs by 10, then divide by 10 at the very end and change your output from DINT to REAL
Thank you for your explanation