RSlogix 500 PID Block
- Thread starter kirk
- Start date
Mickey
Lifetime Supporting Member
I prefer to scale the set point to engineering units. (Attached Image 1)
People understand engineering units better then raw data values. Raw data values have no real world meanings.
People understand engineering units better then raw data values. Raw data values have no real world meanings.
Peter Laing
Member
A simple way that works for me is to stay with the native integer format and scale your data for increased resolution. In my example of a temperature control PID, a setpoint temperature of 31.18C is represented by an SP of 3118 and a PV of 31.29 is 3129. See image
Mickey
Lifetime Supporting Member
That's just engineering units with an implied decimal point. That's the way it was done before PLC's supported floating point numbers.
Works as long as everybody knows where the decimal point is.
Ya, I used to do it that way but quit that with the first PLC I had that supported Floating point.
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