adccommunitymod (AutomationDirect) asked a question.
Bi-Polar Temperature Display on an eztouch
Created Date: September 23,2003
Created By: TSimmons
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Well that should sum it up.... I haven't been able to figure out how to get a proper bi-polar temp. display on an eztouch screen. I have a D450 with a 8 point rtd card. When you read the values to a vmem location, you lose the sign. How do I put it back in and display it on the eztouch?
Created Date: September 23,2003
Created by: TSimmons
Well that should sum it up.... I haven't been able to figure out how to get a proper bi-polar temp. display on an eztouch screen. I have a D450 with a 8 point rtd card. When you read the values to a vmem location, you lose the sign. How do I put it back in and display it on the eztouch?
Created Date: September 23,2003
Created by: JimHoward
First, you do not "lose the sign " when the RTD data is transfered to the V-Memory locations. Even when you mask off the sign bit with the the bit is still in the original V-Memory location.
For example, if your 1st RTD is transfered to V2000 (as a raw BINARY number):
mask off the sign bit
convert it to a real number
real temperature
Now, let's take care of the sign:
B2000.15
--]
V3000 is a real number, with the sign, that can be directly displayed on the EZ-Touch as a FLOATING_PT_32 data type.
Created Date: September 24,2003
Created by: Tech Guy
If your RTD value is in Two's Complement, Binary format then you could also display the raw value (V2000 in JimHoward's example) as Signed_Int_32 as well.