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Re: MIN MAX
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Posted by Phil on Sunday, 27 July 2008, at 10:42 a.m.,
in response to Re: MIN MAX, posted by Lorne
Hi Lorne.
When I give expression examples I try to keep them as simple as possible. And by that I mean that avoid using any tricks to cut down on device slots. These tricks may make it harder to understand what I'm showing.
On the other hand, Bill has become a master at minimizing devices.
For example, In this case I used a constant expression to save the value "1". I'm sure Bill would have used an unallocated Run monitor to do this instead... just set the scale to 0 and the offset to whatever constant you want.
Likewise I allocated an expression for min, max and filter. In truth you only need two additional expressions, because you could have "filtered" the original temperature sensor value. So whereas I showed using 4 expressions, you probably only needed two.
Also, I might show using several expressions to calculate total BTU...
eg:
BTU_PER_T = 500
DeltaT = THigh - TLow
BTUH = DeltaT * BTU_PER_T
To make what's going on obvious...
BUT... you could just have one expression:
BTUH = THigh - TLow
and then set the "scale" to 500 on the calibration page.
Bingo... three expressions reduced to 1.
You don't have access to DeltaT any more, but you may not need it.
Phil.
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