HCPL-0721 datasheet(12/18 Pages) AVAGO

12 / 18 page

Figure 15. Typical field bus communication physical model

Digital Field Bus Communication Networks

To date, despite its many drawbacks, the 4 - 20 mA ana-

log current loop has been the most widely accepted

standard for implementing process control systems. In

today’s manufacturing environment, however, automat-

ed systems are expected to help manage the process,

not merely monitor it. With the advent of digital field bus

communication networks such as CC-Link, DeviceNet,

PROFIBUS, and Smart Distributed Systems (SDS), gone

are the days of constrained information. Controllers can

now receive multiple readings from field devices (sen-

sors, actuators, etc.) in addition to diagnostic informa-

tion.

The physical model for each of these digital field bus

communication networks is very similar as shown in

Figure 15. Each includes one or more buses, an interface

unit, optical isolation, transceiver, and sensing and/or ac-

tuating devices.

CONTROLLER

TRANSCEIVER

OPTICAL

ISOLATION

BUS

INTERFACE

TRANSCEIVER

OPTICAL

ISOLATION

BUS

INTERFACE

TRANSCEIVER

OPTICAL

ISOLATION

BUS

INTERFACE

TRANSCEIVER

OPTICAL

ISOLATION

BUS

INTERFACE

TRANSCEIVER

OPTICAL

ISOLATION

BUS

INTERFACE

FIELD BUS

XXXXXX

YYY

SENSOR

DEVICE

CONFIGURATION

MOTOR

STARTER

MOTOR

CONTROLLER

HCPL-0721 Datasheet(PDF) 12 Page - AVAGO TECHNOLOGIES LIMITED

HCPL-0721 Datasheet(HTML) 12 Page - AVAGO TECHNOLOGIES LIMITED

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Datasheet Download

Link URL