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GFK-0825F Chapter 5 Station Configuration 5-87
5
Scaling Range
Scaling can be used to define a constant-slope mapping from the value in engineering units sent by
the BIU to a channel's output voltage. The default scaling configuration (-10V to +10V) provides
an output voltage range of -10,000 (low span value) to +10,000 (high span value) for engineering
units (AI) values of -10,000 to +10,000.
On this screen, specify the default range used for scaling analog output data. There are two
predetermined range and data scaling combinations (-10V to +10V and 0V to +10V).
S:1 CH1 RANGE
-10V TO +10V
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The default is -10V to +10V, which provides negative/positive scaled values. For positive values
only, select 0V to +10V. Note that if the 0V to +10V range is used, the module will
not
report
underrange faults during operation.
For either selection, you can use the default scaling parameters or enter different ones on the
scaling screens.
Selection Data Range = Output Voltage (mV)
-10V to +10V -10,000 to +10,0000 = -10,000 to +10,0000
0V to +10V 0 to +10,000 = 0 to +10,000
The illustration below shows the default relationship between span values and digital to analog
counts.
Commanded Value in En
g
ineerin
g
Units (in Millivolts)
Minimum Output
(~ -10.8V)
Digital to Analog Converter Output Values
0-10000
12000
16383
212
10000
Range: -10V to +10V
Range: 0V to +10V
15170
Maximum Output
(~ 10.8V)