Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Uživatelský manuál stáhnout pdf (Strana 47)

4–7Configuring 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

5/+55mV Input

Millivolt Ć5mV +55mV

5/+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).

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Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Uživatelský manuál Strana 47