signal configuration range for REAL signals using PLC Connect and AC500
we are using the ABB AC500 in combination with ABB Compact HMI. We configured all the OPC signals with PLC connect. Now we see there is a scaling problem between the SCADA and the AC500 for REAL signals.
First example: when the operator gives -0.06 as a parameter, the same signal in the PLC gets the value -0.0625.
Second example: when the operator gives -0.34 as a parameter, the same signal in the PLC gets the value -0.34375.
What is the best way to set generic Low and High limits for these REAL signals? The min and max range in SCADA is -1E+38 to 1E+38 and for the PLC this is 1.175494351e-38 to 3.402823466e+38. I am talking about 32 bit REAL's.
See the print screen attached in this question for more information.
Voted best answer
As a proposal - you don't have to use so big numbers for Low and High limit in SCADA for analog values. Please try with a real ranges for that signals, or if you don't know them, use a bigger, but not so big. At least you may be have a real physical signals, so the range could be estimated.
Also do setting as in your example - the PLC range and SCADA range should be identical.
PLC min = 0
PLC max = 1000
Signal min = 0
Signal max = 1000