Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 47)

4–7 Configuring the Module
Publication 1771ĆUM127B-EN-P - December 2002
Channel Type Sensor Low Scaling Point High Scaling Point
10V Output Ć10.0V +10.0V
25mA Output 4mA 20mA
50mA Output 1mA 50mA
5V Input 1.0V 5.0V
10V Input Ć10.0V +10.0V
4Ć20mA Input 4mA 20mA
Ć5/+55mV Input
Millivolt Ć5mV +55mV
Ć5/+55mV Input
Temperature Ć300C/Ć508F 1800C/3272F
100mV Input
Millivolt Ć100mV +100mV
100mV Input
Temperature Ć300C/Ć508F 1800C/3272F
650 Ohm Input
Resistance 1.0 Ohm 650 Ohm
650 Ohm Input
Temperature Ć200C/Ć328F 900C/1652F
To implement the scaling feature, you insert the minimum and
maximum scaled values in the appropriate configuration words.
Scaling values can be entered in either BCD or binary format. The
range of binary format scaling values is +
32767; BCD format is
+7999. Remember to check the data format bit for proper control.
For example, assume that at 0mA, the device connected to this input
channel is producing 0 psi, and at 20mA it produces 150 psi.
Extrapolation indicates that at 4mA, the device is producing 30 psi.
By setting the low scale value of the input to 30 and the high scale
value to 150, this input channel will report data in psi.
For better resolution, you can multiply both of the scaling values by
the same multipler as long as both scale values are in the range of
+32767 binary or +7999 BCD. By setting the low scale to 3000 and
the high scale value to 15000, you would report data in units of 0.01
psi per count.
Maximum resolution can be obtained by setting the low scale value
to -32767 (-7999 in BCD) and the high scale value to +32767 (+7999
in BCD).