Rockwell-automation MDO16GNS 16-Channel Digital Output Module 48Vdc Manual de usuario descargar pdf (Pagina 8)

8

MDO16GN

S

October

200

5

–

Issue 2

Triguard

SC30

0E

Figure

2

-

3 Field

output

connector

J2

pinouts

Connector

J3

pin

1c

is

connected

to

earth.

All

other

pins

on

J3

are

connected

to

field

supply

return.

THEORY OF OPERATION

The

channel

output

command

information

from

the

main

processor

follows

three

identical

paths

through

the

MDO16GNS

(see

Figure

2

-

4 ),

each

path

is

controlled

by

its

own

microcontroller

in

the

common

interface.

In

order

to

minimise

the

number

of

data

connections

acro

ss

the

1kV

system

-

to

-

field

barrier,

the

channel

data

are

converted

to

serial

form

before

entering

the

module

from

the

common

interface.

In

this

manner

16

output

channels

can

be

served

by

just

three

paths

instead

of

48.

The

three

data

streams

are

each

applied

to

opto

-

isolators

which

mark

the

interface

between

the

system

and

field

sides

of

the

circuit

and

provide

a system

-

to

-

field

channel

isolation

of

1kV.

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

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