Rockwell-automation MDO32BNS 32-Channel Digital Output Module Instrukcja Użytkownika Pobierz pdf (Strona 13)

MDO32BNS October

200

5

–

Issue 7

13

Triguard

SC300E MDO32BNS 32

-

Channel Digital Output Module

COMMON INTERFACE

The

three

discrete

control

circuits

in

the

Common

Interface

(A,

B,

and

C)

(Figure

2

-

6)

are

each

responsible

for

the

control

of

the

corresponding

one

third

of

the

I/O

module

circuits.

Each

control

circuit

comprises

a microcontroller

with

a dedicated

watchdog,

data

buffers

and

shared

RAM.

The

circuit

is

powered

via

the

module

and

permits

live

insertion

of

replacement

modules.

Th

e microcontrollers

co

-

ordinate

I/O

signal

processing,

signal

path

diagnostics,

on

-

line/off

-

line

status

and

signal

status

read/write

cycles

to

and

from

the

system

processors

via

an

I/O

communications

bus.

All

I/O

modules

have

an

identification

code

which

is

read

by

the

Common

Interface

and

passed

to

the

MPPs

for

verification.

The

on

-

line/off

-

line

status

is

determined

by

the

MPPs.

If,

for

maintenance

purposes,

the

On/Off

Line

Request

switch

on

the

front

of

the

module

is

operated,

the

action

is

read

by

all

three

microcontrollers

and

the

request

passed

to

the

MPPs

which

may

then

grant

the

request.

The

watchdog

on

each

microcontroller

extinguishes

the

Health

LED

on

the

I/O

module

front

panel

in

the

event

of

a microcontroller

failure,

LFD

failure,

a voting

discrepancy,

loss

of

field

supply

or

open

circuit

conditions.

SYSTEM CONFIGURATION

The

Digital

Output

module

requires

a ‘dual

-

slot

hot

repair’

configuration

in

order

to

maintain

any

normally

energised

field

loops

during

repair.

We

recommend

that

the

‘dual

-

slot

h

ot

repair’

configuration

is

used

for

all

output

modules.

The

‘dual

-

slot’

configuration

does

not

require

the

hot

repair

slot

to

be

populated.

If

the

hot

repair

partner

module

is

fitted

during

normal

operation,

the

output

module

pair

should

be

de

-

rated

by

50%;

unless

forced

air

-

cooling

is

used.

NOTE

Fitted

Hot

Repair

partner

modules

should

be

bought

on

-

line

as

part

of

a regular

maintenance

cycle

to

allow

full

diagnostic

reporting

for

both

modules.

The

Digital

Output

module

has

a relatively

high

power

dissipation

which

places

some

constraints

on

its

use

in

convection

cooled

systems.

As

each

Digital

output

module

will

dissipate

59W

when

run

at

full

capacity

we

recommend

that

these

modules

are

configured

in

the

lowest

chassis

within

each

cabinet

bay.

If

Digital

Output

modules

are

configured

in

slots

located

above

a fully

loaded

Digital

Output

module

we

recommend

that

the

module

is

de

-

rated

by

50%.

When

forced

air

-

cooling

is

applied

to

a system

to

aid

heat

dissipation

then

these

limitations

are

removed.

When

c

onfiguring

a system

care

should

be

taken

to

ensure

that

the

maximum

working

temperature

of

60

C is

not

exceeded

in

the

applications

maximum

ambient

conditions.

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