General Discussions
Adjust the values from the PLC / Scaling?

Are there any rules/algorithm for scaling in VTScada to adjust the values from the PLC to the real values?
At the moment we are getting some values but we have to adjust them to the Output we want to have... Can we do that by scaling is there another possible solution?

Thanks four your expertise and help!

Are there any rules/algorithm for scaling in VTScada to adjust the values from the PLC to the real values? At the moment we are getting some values but we have to adjust them to the Output we want to have... Can we do that by scaling is there another possible solution? Thanks four your expertise and help!

There are two things to consider when looking at the incoming data and how these are used can depend on the driver you are using.

Typically, the first thing to ensure is that the value you are receiving is interrupted the same as the value the PLC is transmitting. If not, you'll want to check to see if you need to add a data suffix to your address. This is very common on modern Modbus PLC's as they often hold calibrated floating point numbers in two registers.

You can learn more about address suffixes here: https://www.vtscada.com/help/Content/D_Tags/Dev_DataSuffixesForTagIO.htm

The other consideration, for unscaled values, is the tag scaling. Here, you'll want to enter the values for two points the same as if you were calculating the slope in a linear equation. IE: 0 to 4095 bits may represent a calibrated range of 0 to 435 lbf on a load cell.

Does that make sense?

There are two things to consider when looking at the incoming data and how these are used can depend on the driver you are using. Typically, the first thing to ensure is that the value you are receiving is interrupted the same as the value the PLC is transmitting. If not, you'll want to check to see if you need to add a data suffix to your address. This is very common on modern Modbus PLC's as they often hold calibrated floating point numbers in two registers. You can learn more about address suffixes here: https://www.vtscada.com/help/Content/D_Tags/Dev_DataSuffixesForTagIO.htm The other consideration, for unscaled values, is the tag scaling. Here, you'll want to enter the values for two points the same as if you were calculating the slope in a linear equation. IE: 0 to 4095 bits may represent a calibrated range of 0 to 435 lbf on a load cell. Does that make sense?

Trihedral Engineering Ltd.

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