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c. Click Save.
4.11.3 Assign a variable to a register
To assign a variable to a register, from the Modbus Map Editor window, double-click the
appropriate Variable(s) cell and select a new variable.
For a demonstration of how to use the context-sensitive variable selector, see Section 1.11.
4.11.4 View or edit scales
MON2020 uses scales to convert floating point values to integers.
MON2020 supports 32 different scales that are labelled SCALED_FP1 through
SCALED_FP32. The Data Type column on the Modbus Map Editor window displays the type
of scale, if any, that is being used for a particular register. If a scale is being used, the Zero
Scale and Full Scale columns will display the lower and upper values for the chosen scale.
To view the list of scales, select Application → Communication... → Registers and click
Edit Scales from the Modbus Map Editor window. The Edit Scales window displays all of the
scales, along with each scales lower and upper values.
Use the following formula to calculate the variable’s integer value:
where:
R
F
= Full Scale, range
R
Z
= Zero Scale, range
S
F
= Full Scale, scale
S
Z
= Zero Scale, scale
D
fp
= Floating Point value
For example:
RF = 65535
RZ = 0
SF = 100 (from SCALED_FP1)
SZ = 0 (from SCALED_FP1)
Dfp = 97.13 (scaled percent for methane)
Application
106