Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Manual do Utilizador descarregar pdf (Página 16)

Publication 1769-UM008A-EN-P - November 2001

1-6 Overview

Module Operation

Module Block Diagram

The module’s input channel circuitry consists of four differential

analog inputs multiplexed into a single analog-to-digital (A/D)

converter. The A/D converter reads the selected input signal and

converts it to a digital value which is presented to the controller. The

multiplexer sequentially switches each input channel to the module’s

A/D converter. The module’s output channel uses a digital-to-analog

(D/A) converter to read the digital output data from the controller and

convert it to an analog output signal. See the block diagram below.

Module Calibration

The module’s input/output channel calibration is guaranteed by its

design. No field calibration is required.

Vin+

Vout+

Iout+

ANLG COM

Iin+

V/Iin-

CH0

CH1

CH1 CH2 CH3

A-GND

Vref

VREF

AIN+

A/D

MCU

ASIC

VA3

VA2

VA3

VA2

VA1

VA3

VA1 VS1

VS1

VS2

TXD

RXD

A-GND

S-GND

D/A

Input

(same as CH0)

Channel Select

DC/DC

Power

Supply

Galvanic

Isolation

Multiplexer

Bus

Output

(same as CH0)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 103 104

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