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Sub Block
The Sub Block allows the user to subtract a variable's value from another in order to use the result
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The only properties that the sub block has are the two input fields: A and B, where the user must choose the variables (parameters)
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How to use
The user must go to bLine Logic
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Search for the sub bock in the right menu that opens 
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Then drags the block over a main block like SET or IF
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From there, the user just chooses the variables
Example
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The above screenshot represents a very basic setup on how to use and apply the and block.
We set up the value of deltaT as a subtraction of cTRT and cTST, then if the value of the subtraction is greater or equal to 10 we turn the Alarm On, if not the Alarm is set to Off
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