Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual download pdf (Page 9)

1 Publication 1769-UM014B-EN-P - May 2010

Chapter

Overview

This chapter explains how analog data is used, describes the 1769-IF4I isolated

analog input module, and describes the 1769-OF4CI and 1769-OF4VI isolated

analog output modules. Included is information about:

 the use of analog I/O.

 the modules’ hardware and diagnostic features.

 an overview of the 1769 analog input system operation.

 an overview of the 1769 analog output system operation.

How to Use Analog I/O Data

Analog refers to the representation of numerical quantities by the

measurement of continuous physical variables. Analog applications are present

in many forms. The following application shows a typical use of analog data.

In this application, the controller controls the amount of fluid in a holding

tank by adjusting the valve opening. The valve is initially open 100%. As the

fluid level in the tank approaches the preset point, the controller modifies the

output to close the valve 90%, 80%, and so on, continuously adjusting the

valve to maintain the fluid level.

Figure 1.1 Analog I/O Application Example

Controller

Analog I/O

Module

Valve

Level Sensor

Analog Input Wired

to Tank

Analog Output

Wired to Valve

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 127 128

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Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual Page 9