GE VersaMax Manual page 313

10
IC200ALG240
Analog Input Module, 16 Bit Voltage/Current, 1500VAC Isolation, 8 Channels
Scaling Example
A channel is configured in the 0 to 10 volts DC range. It measures a velocity input.
Electronic sensors and mechanical linkage external to the module have determined that an
input level of +1.5 volts DC is equal to –20 feet/second (–6 meters/second), and that +9
volts DC is equal to +180 feet/second (+50 meters/second). Plotting these values on a
graph shows that a signal of 5 volts DC corresponds to a speed of 73.3 feet/second.
For engineering units of feet per second, the following scaling values are used:
An input value of 5.0 volts would be scaled to an engineering value of +00073 (ft/sec).
In this example, scaling to hundredths of feet per second would provide better resolution.
The following scaling values would be used:
An input value of 5.0 volts would be scaled to an engineering value of +7333 (hundredths
of ft/sec).
10-16 VersaMax® Modules, Power Supplies, and Carriers User's Manual – March 2003
Velocity
200
150
100
50
-20
(+1.5V, -20 ft/sec)
-50
-60
Low engineering units
High engineering units
Low span units
High span units
Low engineering units
High engineering units
Low span units
High span units
(+9.0V, +180 ft/sec)
+5.0 +9.0 +10.0
= –20 ft/sec
= +180 ft/sec
= 1500 millivolts
= 9000 millivolts
= –2000 hundredths ft/sec
= +1800 hundredths ft/sec
= 1500 millivolts
= 9000 millivolts
Input
Voltage
GFK-1504K