Rockwell-automation MDO32BNS 32-Channel Digital Output Module Uživatelský manuál stáhnout pdf (Strana 8)

8

MDO32BNS

Oc

tober

200

5

–

Issue 7

Triguard

SC300E

Figure

2

-

3.

Field

output

connectors

J2

and

J3

pinouts

THEORY OF OPERATION

In

accordance

with

TMR

practice,

channel

output

command

information

from

the

system

follows

three

identical

paths

through

the

Digital

Output

Module

(Figure

2

-

4)

each

path

at

the

command

of

its

own

m

icrocontroller

in

the

Common

Interface.

As

the

switching

speed

of

the

module

exceeds

the

system

scan

rate

the

channel

data

can

be

converted

to

serial

form

before

entering

the

module

from

the

Common

Interface.

In

this

manner

32

output

channels

can

be

served

by

just

three

paths

instead

of

96.

The

three

data

streams

are

each

applied

to

opto

-

isolators

which

mark

the

interface

between

the

system

and

output

sides

of

the

circuit

and

provide

a system

to

field

channel

isolation

of

1000V

minimum.

The

data

streams

are

then

applied

to

the

32

-

bit

output

shift

registers.

The

serial

bits

are

clocked

successively

into

the

shift

registers

until

the

32nd

bit

has

been

received,

the

registers

then

latch

the

data

and

present

it

on

the

32

-

bit

buses

(CHANA,

CHANB

and

CHANC)

to

t

he

output

switches.

The

data

is

refreshed

in

this

manner

at

each

scan

of

the

system.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 17 18

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