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Input Range
For the AI channel which supports more than input range, you can configure the
channel setting in "AI/Configuration/Channel Settings".
Channel Mask
You can disable the AI channel to increase the sampling rate of other enabled chan-
nels in "Channel Mask".
Scaling Function
There are two types of scaling function for AI channels:
1.
Input Signal Scaling - Scaling the Input Range
This is for scaling the analog input range within the configured input range, so that
the Modbus value can fit the entire range. For example, Ch0 of WISE-4012 had been
configured with an input range of 0~5V, but the full range of signal from sensors is
1~5V. If users do not use the Input Signal Scaling function, the 1V will be presented
as 13107 in Modbus, 5V will be presented as 65535. But after Input Signal Scaling,
1V will be presented as 0 in Modbus, and 5V will still be presented as 65535.
If you would like to apply the function in the previous example, enter 1 in "Low Scal-
ing Value", and enter 5 in "High Scaling Value".
Note!
The function only increases the resolution of Modbus data, but the accu-
racy still depends on the original input range before scaling. Further-
more, in the previous example, if the 0~10V input range been used for
scaling to 1~5V, it may have a lower accuracy compared to using 0~5V.
For values which are going to be configured for scaling the input range, note that the
"Low Scaling Value" should be lower than "High Scaling Value".
2.
Physical Value Scaling - Scaling the Output Data
Further to scaling the input range of the analog input channel, the output data can
also be scaled. After the function has been applied, it would be easier to read the
Modbus value in the engineering unit. For example, a temperature sensor output
0~10 V which shows 0~100°C. It would be better to read 0~100 in Modbus with float-
ing data format.
In the previous case, you can configure the "Physical Min Scaling Value" and "Low
Scaling Value" as 0, which shows the input voltage 0 V as physical value 0°C; and
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WISE-4671 User Manual
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