Motorola ColdFire MCF5282 User Manual download pdf (Page 60)

Overview

Fieldbus controllers take the measurements

and perform the actions critical to manufacturing

and materials processing. A fieldbus gateway

provides communication to factory floor and

process control devices that are connected via

a large variety of popular protocols. Ethernet is

making rapid inroads into areas formerly covered

by older serial protocols.

Along with this physical layer change, access

via TCP/IP has become increasingly important to

enable enterprise-wide integration. Controllers

are evolving as well, taking over central control

room tasks through distributed processing

schemes. All of these changes are driving a

new level of integration in microprocessors

for industrial applications.

Key Benefits

> The MCF548x devices are particularly well

suited for interfacing legacy fieldbuses such

as CAN, MODBUS and PROFIBUS with

newer technologies such as wired and

wireless Ethernet.

> Multiple Ethernet interfaces on the MCF548x

devices allow straightforward separation of

public and private data streams for an

industrial application.

> The MCF548x devices offer straightforward

interfacing to Freescale’s chipset based on

ZigBee™ technology.

Design Challenges

The trend toward distributed control

places increased computational demands

on fieldbus controllers. Sensing, actuator

and closed loop process control, data

logging and diagnostics must all be

performed in real time. Increasingly

sophisticated operating systems are

required to effectively schedule and

dispatch these tasks. Added to this

load is a rapidly growing

communications throughput.

Older serial protocols are being

encapsulated and transported over

Ethernet on private local area networks

(LANs), while information critical to

productivity and efficient materials

management must travel over the public

Internet. Controllers must be able to be

reprogrammed remotely. This means

gateways must be able to connect legacy

fieldbuses such as CAN, MODBUS and

PROFIBUS with newer technologies such

as 100 Mbps or wireless Ethernet.

MCF548x

Fieldbus Controller/Gateway

ColdFire

®

Embedded Controller Application

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