Rockwell-automation MHB44IND Pulse Input and Analogue Output Module Uživatelský manuál stáhnout pdf (Strana 13)

MHB44IND

October

200

5

–

Issue

2

13

Triguard

SC300E MHB44IND Pulse Input and Analogue Output Module

Common interface

The

three

discrete

control

circuits

in

the

C

ommon

Interface

(A,

B,

and

C)

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.

Figure

2

-

4 Common

interface

-

Block

diagram

The

microcontroller

co

-

ordinates

I/O

signal

processing,

signal

path

diagnostics,

on

-

line/off

-

line

status

and

signal

status

read/write

cycles

to

and

from

the

MPPs

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

extinguishes

the

Health

LED

on

the

I/O

module

front

panel

in

the

event

of

a microcontroller

failure,

LFD

action

or

a voting

discrepancy.

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