Campbell 21X Manuel de l'opérateur télécharger pdf (Page 77)

8.

PROCESSING

AND

PROGRAM CONTROL

EXAMPLES

The

examples are

intended to illustrate

the use

of Processing and

Program Control

flags,

and the

capability

to

direct

the

results

of

Output

Processing

lnstructions to lnput

Storage.

The

specific]examples

may

not be as

important as some

of the techniques

employed,

for example:

Directin|

Output

Processing

to lnput Storage

is used

in

the

Running

Average and

Hainfall

lntensity

exampl4s

(8.1

and 8.2).

Ftags tepts

are

used

in the

Running Average,

lnterrupt Subroutine,

and Converting

Wind

Direction

examplQs

(8.1,

8.5,

and 8.7)

Controlports

and the

Loop are

illustrated

in

the

AM416 example

(8.3).

These exanlples are

not complete

programs

to be taken

verbatim.

They need to be altered

to

fit specific

needs.

8.1

COMPUTATION

OF

RUNNING

AVERAGE

necessary

to compute a

running

average

(i

,

the average

includes

a

fixed

number of

and

is continuously

updated

as

new are taken).

Because the output

interval

is s than

the

averaging

period,

lnstruction

cannot be used;the

algorithm

for

computing

t

the

user.

T

is

average

must

be

programmed

by

following example

demonstrates a

program

a

runnrng

average.

ln this

each

time a

new

measurement

case

a thermocouple

is

made

(in

an

average

is computed

for

the

10

Input

Location

Labels:

1:PanlTemp 1S:Temp

i-5

2:10smplav 16:Temp

i-4

11:Temp i-9 17:Temp

i-3

12:Temp i-8 18:Temp

i-2

13:Temp i-7

19:Temp

i-1

14:Temp i-6

2O:Temp

i

Where i is current

reading,

i-l

is

previous

reading,

etc.

1

01:

10

most

recent samples.

This is done

by

saving

all

10 temperalures

in contiguous

input

locations

and

using

t$e

SpatialAverage

lnstruction

(51)

to

compute

th$

average.

The temperatures

are

stored

in lo(ations

11 through

20.

Each

time

the

01: P17

01:

1

P14

20

1

0

P51

10

11

2

02:

01:

02:

03:

o4:

05:

06:

07:

08:

03:

01:

02:

03:

Table 1 Programs

Sec. Execution

lnterval

Panel

Temperature

Loc

[:PanlTemp]

Thermocouple Temp

(DIFF)

Rep

5 mV slow

Range

lN

Chan

Type T

(Copper-Constantan)

Ref

Temp

Loc Panl

Temp

Loc

[:Temp

i

]

Mult

Offset

SpatialAverage

Swath

First Loc

Temp i-9

Avg Loc

[:1Osmplav]

table

is exebuted,

the

new measurement

is

stored

in location 20 and

the

average is stored

in

location

2.

The

Block

Move

Instruction

(5a)

is

then

used

tO

move

the temperatures

from

locations

12 through 20

down

by one location;

the oldest

rneasurement

(in

location 11)

is lost

when the

temperature

from

location

12 is written

over

it.

8-1

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