Rockwell-automation MDO16GNS 16-Channel Digital Output Module 48Vdc Manual de usuario descargar pdf (Pagina 9)

MDO16G

N

S

October

200

5

–

Issue 2

9

Triguard

SC300E MDO16GNS 16

-

Channel D/O Module 48Vdc

The

data

streams

are

then

applied

to

the

16

-

bit

output

shift

registers.

The

serial

bits

are

clocked

s

uccessively

into

the

shift

registers

until

the

16th

bit

has

been

received.

The

registers

then

latch

the

data

and

present

it

on

the

16

-

bit

busses

(CHANA,

CHANB

and

CHANC)

to

the

output

switches.

The

data

is

continuously

refreshed

in

this

manner

and

updated

at

each

scan

of

the

SC300E

system.

The

output

switch

for

each

channel

comprises

six

FETs

connected

in

the

series/parallel

network

shown

and

providing

2 out

of

3 majority

voting

between

the

three

paths

A,

B and

C.

A

front

panel

LED

at

the

switch

output

is

lit

when

the

switch

is

closed.

Voltage

and

current

monitoring

circuits

are

also

connected

to

the

switches

to

provide

outputs

for

the

Latent

Fault

Detection

(LFD)

system.

These

outputs

are

fed

back

to

the

microcontrollers

via

dedicated

shift

registers

and

o

pto

-

isolators.

The

feedback

information

confirms

that

the

output

has

switched

to

the

commanded

state

and

that

the

line

is

not

open

or

short

circuit.

Testing

of

the

output

switches

by

the

LFD

circuits

is

co

-

ordinated

by

the

microcontrollers

on

the

common

i

nterface.

When

all

outputs

are

in

the

healthy

condition

and

the

microcontrollers

confirm

no

faults

present,

the

SC300E

processors

(main

processors)

will

instruct

each

microcontroller

in

turn

to

switch

its

output

alone

to

the

opposite

state

and

confirm

the

correct

operation

of

its

individual

output

switch.

The

module

power

requirements

are

served

from

two

different

sources.

The

power

for

the

output

-

side

circuits

is

derived

from

the

chassis

12V

supply

via

dc/dc

converters.

All

of

the

supplies

are

monitored.

Electronic

fuse

circuits

sense

the

current

in

each

output

path

and

cut

off

the

upper

FET

if

the

current

exceeds

a predetermined

limit.

An

On/Off

Line

Request

switch

on

the

front

panel

enables

a request

to

be

sent

to

the

SC300E

system

that

the

module

be

ta

ken

off

-

line

for

maintenance

purposes

or

returned

on

-

line.

The

module

contains

a hardware

identity

circuit

that

enables

system

identification

of

the

module,

and

three

manual

links

1,

2 and

3.

Link

1 allows

the

module

to

be

set

up

for

321

or

320

mode

operat

ion

which

sets

the

threshold

that

determines

how

much

of

the

circuit

can

be

degraded

while

still

preserving

overall

operation.

320

mode

means

that

the

system

will

continue

to

function

with

two

out

of

three

serviceable

circuits.

If

the

number

falls

to

one

o

ut

of

three

the

last

read

data

is

maintained.

In

321

mode

the

system

will

continue

to

function

with

one

out

of

three

serviceable

circuits.

If

that

fails

the

last

read

data

is

maintained

and

the

module

is

taken

off

-

line.

Link

2 (HLV/GTZ)

determines

whether

,

in

the

event

of

a failure

due

to

321/320

action,

the

last

read

values

are

held

(HLV)

or

are

set

to

zero

(GTZ).

Link

2 is

only

active

however,

if

Link

3

(ICCB/HW)

is

set

to

HW.

If

Link

3 is

set

to

ICCB

Link

2 is

ignored

and

its

function

determined

by

soft

ware.

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