GE VersaMax Manual page 400

Analog Output Module, 16 Bit Voltage/Current, 1500VAC Isolation, 4 Channels
Configuring Scaling
The module converts digital output values received from the CPU or NIU to electrical
signals (either current or voltage, as configured). By default, the module converts this data
to 1 millivolt or 1 microamp "internal units" for convenience in scaling and comparing to
actual meter measurements.
The module's default scaling can be changed to tailor the output data to a specific
application. Typically, engineering units represent millivolts or microamps. But they may
also represent physical units such as degrees or centimeters per second. When
reconfiguring scaling, it is important to be sure that the chosen Engineering Units values
would not result in Overrange or Underrange output levels.
The scaling for each channel can be configured independently. Scaling is configured by
selecting corresponding low and high engineering units values and low and high internal
values (counts) for two points.
During operation, the module will use the straight line defined by these two pairs of
configured scaling values to convert internal values to current or voltage signal levels that
represent appropriate engineering units.
Scaling Values for 1mV or 1µA Engineering Units
For many applications, the engineering units are either millivolts or microAmps. These
units are easy to scale. Simply use the table below to find scaling values that are
appropriate for the channel's configured range.
Examples
4 mA to 20 mA
-10 volts to +10 volts
0 mA to 20 mA
-10 volts to +10 volts
GFK-1504K Chapter 11 Analog Output Modules
Output Enter this engineering
Range units value
4 mA Low +4,000
20 mA High +20,000
0 volts Low 0
+10 volts High +10,000
0 mA Low 0
20 mA High +20,000
-5 volts Low -5,000
+10 volts High +10,000
11
IC200ALG331
Span Units
(microAmps)
Low +4,000
High +20,000
Low +4,000
High +20,000
Low 0
High +20,000
Low -5,000
High +10,000
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