Rockwell Automation 1771-OFE/B Analog Output Module User Manual User Manual
Page 34
3-8
Publication 1771Ć6.5.30 - November 1998
If you do not wish to scale a particular channel, set the scaling values
as shown below.
If your range is:
Set Maximum
Scaling Value to:
Set Minimum
Scaling Value to:
4Ć20mA
1Ć5V
4095
0000
0Ć10V
+10 to Ć10V
4095
Ć4095
1
1
This also requires you to set the appropriate sign bit in the configuration word for the minimum
scaling value.
For example, suppose you choose the 1 to 5 volt range and BCD
data format for your module. You have a thermocouple input that
reports a temperature between 100
o
C and 900
o
C back to your
processor. You would like this input temperature scale to correspond
to an output meter scale.
You would enter the following minimum and maximum scaling
values into Words 6 and 7 of the write block:
Meter Scale Value
Scaled Value
Output Voltage
Unscaled
Value (BCD)
Meterscale 100%
900
o
C
5.0V
4095
700
o
C
4.0V
3072
Example:
Word 6 = 0100
Word 7 = 0900
500
o
C
3.0V
2048
Example:
Meterscale 31%
Meterscale 25%
350
o
C
300
o
C
2.25V
2.0V
1280
1024
Meterscale 0%
100
o
C
1.0V
0
If the processor sends a data value to the module that corresponds to
350
o
C, the value is scaled to the 100
o
C to 900
o
C range and the
corresponding output voltage for that channel is 2.25 volts, which
would position the scale accordingly at 31% of full scale.
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