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signal configuration range for REAL signals using PLC Connect and AC500

Hello,

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.