Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 14)

Table 1.

Execute

every

x sec.

0.0125<x<6553

I nstru ctions

are

executed

sequentially

in

the order

they are entered

in the

table. One

complete

pass

through

the table

is

made

each execution

interual

unless

program

control

instructions

are used to

or branch

execution.

NormalOrder:

MEASURE

PROCESS

CHECK OUTPUT

COND.

PUT

PROCESSING

21X

MICROLOGGER

OVERVIEW

with an allowable

range of 0.0125 to

6553

seconds. Intervals shorter

than

0.1

seconds

are

allowed

only in Table 1.

Subroutine

Table

3

has no

execution

interval; subroutines are

only

executed when

called

from

Table 1 or 2.

OV2.3.1 THE

EXECUTION INTERVAL

The execution

interval specifies

how often the

program

in the

table

is executed, which

is

usually determined

by how

often the sensors are

to

be

measured.

Unless

two

different

measurement rates are needed,

use only one

table.

A

program

table

is executed sequentially

starting

with

the first instruction

in the table

and

proceeding

to the end of the

table.

Each instruction

in the table requires

a

finite

time to execute.

lf

the

execution interval is less

than the time required

to

process

the

table, the

21X overruns

the execution interval, finishes

processing

the

table

and waits

for the next

execution

interval

before initiating

the table.

When an overrun

occurs, decimal

points

are

shown on either

side

of

the G on

the

display in

the LOG mode

(.0).

Overruns

and

table

priority

are discussed

in Section 1.1.

FIGURE

OV2.2. Program

and

Subroutine

Tables

OV2.3.2

THE

OUTPUT

The

interval at

which

oul

independent

from the

ex

than the

fact

that it must

executed

(i.e.,

a table

ce

execution

interval

and or

A

single

program

table c

output intervals and conr

unique

data

set

(output

i

Instructions are

used to

which

determines

when

Output Processing Instrt

instruction setting

the Or

data

output and

its

sequ,

output

array

is created b

Control

Instruction

settin

in

response to an output

Output Processing Instrt

set to output.

OV3. PROGRAMMING

A

program

is created

by

datalogger or on a PC

ur

Datalogger

Support

Soft

This manualdescribes d

able 2.

Execute

every

y

sec.

1

<v<6553

Table

2 r.s used if

there is a

need

to measure

and

process

data on a separate

interualfrom

that

in Table

1.

ov-6

Table 3.

Subroutines

A

subroutine is executed

only

when

called

from

Table I

or 2.

Subroutine

Label

lnstructions

End

Subroutine

Label

Instructions

End

Subroutine Label

lnstructions

End

TPUT

INTERVAL

ch output occurs is

the

execution

interval, other

I must occur when

the

table is

rble cannot have a 10 minute

and output every 15

minutes)

able can have many different

d conditions, each with a

utput array). Program Contro

ied

to

set

the Output

Flag

when output

occurs.

The

I

Instructions which

follow the

the Output

Flag

determine thr

i

sequence. Each

additional

ated

by another

Program

setting

the

Output Flag

high

rutput condition, followed by

I

Instructions

defining the dati

MING THE 21X

ed by

keying it

directly

into

th,

PC

using

the PC208

rt

Software

program

EDLOG.

'ibes

direct interaction with thr

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