Campbell 21X Návod k obsluze stáhnout pdf (Strana 13)

3.

Final

stored

The use

of

Storage

in

processing

While the

constant,

the areas

Section

1

memory,

progranfs

entered

in Program

Tables

1 and

2, and

$ubroutine

Table

3.

(Sections

OV3,

1.1)

state

Module

or

for retrieval via

links.

Values are stored

in Final only

by

the Output

Output

19,296

power

Instructions and

only

when

the

is set

in

the users

program.

The

allocated' to Final Storage at

is reduced

if

Input or

Intermediate

is increased.

Systeni Memory

-

used for overhead tasks

such as] compiling

programs,

transferring

data, etb. The user

cannot access this

ge -

Final,

processed

values

are

for transfer

to

printer,

tape,

solid

Input, Intermediate, and Final

measurement

and

data

is

shown

in Figure

OV2:1.

size of

these

three

areas

remains

may be reallocated between

accommodate

different

t and

processing

needs

(*A

Mode,

The size of

system

and

program

fixed.

21X MICROLOGGER OVER\NEW

used to develop high

level

algorithms

to

process

measurements

prior

to Output

Processing

(Section

1 0).

OUTPUT

PROCESSING INSTRUCTIONS

(69-82,

Section 1 1) are the

only

instructions

which store data

in Final Storage

(destination).

Input Storage

(source)

values

are

processed

over time

to

obtain averages,

maxima, minima, etc.

There

are two types

of

processing

done

by Output Instructions:

Intermediate

and

Final.

Intermediate

processing

normally

takes

place

each

time the

instruction is executed.

For

example,

when the Average Instruction

is executed, it adds the

values from the

input locations

being

averaged

to

running

totals

in lntermediate

Storage.

lt

also

keeps

track of

the

number of samples.

Final

processing

occurs only when the

Output

Flag is high. The Output Processing

Instructions

check

the Output Flag. lf the

flag is high,

finalvalues

are

calculaled

and

output.

With

the

Average,

accumulated

totals

are divided by the

number

of samples

and the

resulting

averages sent to

Final

Storage.

lntermediate locations

are

zeroed

and the

process

stafts

over. The Output

Flag, Flag

0,

is

set

high by

a

Program

Control

Instruction which

must

precede

the

Output

Processing Instructions in

the

user

entered

program.

PROGRAM

CONTROL

INSTRUCTIONS

(85-98,

Section 12) are used

for logic

decisions

and conditional statements.

They

can set

flags,

compare

values

or times,

execute

loops,

call subroutines,

conditionally

execute

portions

of the

program,

etc.

OV2.3 PROGRAM

TABLES

AND

THE

EXECUTION

AND OUTPUT

INTERVALS

Programs are

entered

in Tables

1 and

2.

Subroutines,

called

from

Tables

1

and

2, are

entered

in Subroutine Table 3.

The size of each

table

is flexible,

limited only by the total amount

of

program

memory. lf Table

1 is the only table

programmed,

the entire

program

memory

is

available

for Table 1.

Table 1 and

Table

2 have independent

execution

intervals.

entered

in

units of seconds

ov2.2 21Xl

Figure 1 illustrates the

use

of the three

act

on data.

The

used

to

control

different

i ion

types which

fouilh type, Control,

is

output ti and

vary

program

execution.

are

identified

by

numbers.

1. rNPUT/OUTPUT TNSTRUCTTONS

(1-

26,101-104, Section 9) controlthe

terminal

strip

inputs

and outputs

(the

sensor is

the

source, Figure OV1-2), storing the

results in

Input

Sprage

(destination).

Multiplier

and

offset

pBrameters

allow conversion of linear

signals

into

engineering units.

The Control

Ports

and

Continuous Analog Outputs

are

also addressed

with

l/O lnstructions.

2. PROCqS$NG TNSTRUCTTONS

(30-66,

Sectionr 1 0)

perform

numerical operations

on

valups

located

in

Input Storage

(source)

and stofe the

results

back

in Input Storage

(destin4tion).

These

instructions can be

4.

ov-5

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 190 191

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