Rockwell-automation MHB44IND Pulse Input and Analogue Output Module Manuale Utente Scaricare il pdf (Pagina 11)

MHB44IND

October

200

5

–

Issue

2

11

Triguard

SC300E MHB44IND Pulse Input and Analogue Output Module

Pulse Inputs

The

overall

period

of

one

or

more

cycles

of

the

input

is

measured.

Frequency

is

calculated

by

dividing

the

number

of

cycles

by

the

overall

period.

The

pulse

input

voltage

on

each

independent

path

passe

s via

an

isolating

transformer

to

an

amplifier,

which

compensates

for

the

frequency

characteristics

of

the

transformer

and

performs

automatic

level

control

to

cater

for

the

wide

range

of

input

amplitude

(see

Figure

2

-

2).

The

amplifier

output

is

converted

t

o a

pulse

train

feeding

a 16

-

bit

frequency

counter

controlled

by

the

Common

Interface

(CI).

Voting

of

the

frequency

data

between

paths

is

performed

by

the

RTTS.

The

pulse

trains

from

all

three

independent

paths

are

combined

and

trigger

circuits

which

caus

e the

front

-

panel

LEDs

to

flash.

The

four

red

LEDs,

corresponding

to

the

pulse

-

input

channels,

flash

when

pulse

trains

are

being

received.

Four

pairs

of

sockets

are

provided

for

monitoring

the

input

lines

via

100k

ohm

resistors.

Figure

2

-

2 Pulse

input

section

-

Schematic

block

diagram

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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