Campbell 21X Manual do Operador descarregar pdf (Página 11)

ovl.2

EXCITATION

OUTPUTS

The first

fou numbered

terminals on

the

lower

are the SWITCHED

EXCITATION

terminal

supply

programmable

for

resistive bridge

ts. The

excitation channels

are

only

on during

the

rneasurement.

ovl.3

ANALOG OUTPUTS

The

two

Codtinuous

Analog

Output

(CAO)

channels suSply continuous

output

voltages,

under

program

control,

for use with

strip charts,

X-Y

plotters,

or

proportional

controllers.

OV1.4 DIGITAI..J

CONTROL

PORTS

The

six

DIGI1TAL

CONTROL

PORTS

(0

or 5

volt

states)

allow

on-off

controlof

external

devices.

Thfse

control

potts

have

a very

limited curreht output

(5

mA) and

are used to

switch solid

State

devices

which in turn

provide

power

to

rel{y

coils

(Section

14.4).

OV1.5

PULSE

OOUNT

INPUTS

The four

PULSE COUNT

INPUTS measure

contact

clos{re,

low

levelAC, or

high

frequency

pulse

signal$.

periods

in

the

field.

OV2.

M

AND

PROGRAMMING

coNc

The 21X

be

programmed

before

it will

A

program

consists

.

21X

MICROLOGGER

OVERVIEW*

table.

The

program

table

is

given

an execution

intervalwhich

determines

how

frequently that

table

is executed.

When the table

is

executed,

the

instructions are executed

in sequence

from

beginning

to

end.

After

executing

the table, the

21X waits

the remainder

of

the

execution

interval

and

then executes

the table

again

starting

at the beginning.

The interualat

which the

table

is

executed

will

generally

determine the

intervalat

which the

sensors

are measured.

The interval at

which

data are

stored is separate

and

may

range from

samples

every execution

interval

to

processed

summaries

output hourly, daily,

or on

longer or

irregular

intervals.

Figure

OV2-1 represents

the measurement,

processing,

and data

storage sequence

in the

21X and

shows the

types of

instructions used

to

accomplish

these tasks.

OV2.1 INTERNAL

MEMORY

The

21X

has

40,960

bytes of

Random

Access

Memory

(RAM),

divided

into five areas.

The

five areas

of

RAM

are:

1. Input

Storage

-

Input

Storage

holds the

results

of measurements

or

calculations.

The

*6

Mode

is used

to view

Input

Storage

locations to

check current

sensor

readings

or

calculated

values.

lnput Storage

defaults

to

28 locations.

Additional

locations can

be

assigned using

the

"A Mode.

2.

Intermediate

Storage

-

Certain

Processing

Instructions and

most of the

Output

Processing

Instructions

maintain

intermediate

results

in

Intermediate

Storage.

Intermediate

storage

is

automatically

accessed

by the

Instructions

and

cannot be

accessed bythe

user.

The

default

allocation

is 64 locations.

The

number of

locations

can be

changed using

the

*A

Mode.

channels.

excitation

make any

of

a

group instructions

entered

into a

program

connection

tb the 21X

power

supply.

The +12

and

ground

ferminals

can

be

used

to

connect

an external

f

2

volt

battery

to

the

21X to

ov-3

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