Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 28)

SECTION

1. FUNCTIONAL

MODES

1.1.3

TABLE PRIORITY/INTERRUPTS

Table

1

execution has

priority

over

Table 2. lf

Table

2 is being

executed when

it is time to

execute

Table 1, Table

2 will

be interrupted.

After

Table 1 is

completed, Table

2 resumes

at

the

point

of

interruption.

lf

the

execution interval

of

Table

2

coincides

with

Table

1, Table 1

will

be executed first,

followed

by Table

2.

Interrupts

by Table

1

are

not

allowed

in

the

middle

of

a measurement

or while

output

to

Final

Storage is in

process

(the

Output Flag, flag

0, is

set high). The

interrupt occurs

as soon

as

the

measurement

is

completed or flag 0 is

set

low.

1.1.4 COMPILING

A PROGRAM

When

a

program

is first entered,

or if

any

changes

are

made

in the

*1

,*2,*3,

*4, *A,

or

*C

Modes,

the

program

must

be

compiled before

it

starts

running. The

compile function

checks for

programming

errors

and optimizes

program

information

for

execution. lf

errors are detected,

the appropriate error

codes are indicated

on the

Display

(Section

3.10). The

compile

function

is

executed

when the

*0

,

*6,

or

*B

Modes are

entered

and

prior

to saving a

program

listing in

the

*D

Mode.

The

compile

function

is only

executed

a{ter

a

program

change has been

made;

any subsequent use

of any

of

these

Modes

does not cause compiling.

When

the

*0, *B,

or

*D

Mode is

used to compile,

all output

ports

and flags are set low, the

timer

(lnstruction

26)

is reset, and

data values

contained in Input

and Intermediate

Storage are

RESET

TO ZERO.

When

the

*6

Mode is

used to compile data

values

contained in Input Storage,

the state

of

flags,

control

ports,

and the timer

are

UNALTERED.

Compiling always

zeros

Intermediate

Storage.

1.2

SETTING AND

DISPLAYING THE

CLOCK.

*5

MODE

The

"5 Mode is used

to display

time or change

the

year,

day

of

year,

or

time. When

*5

is

pressed,

the

current

time

is

displayed. The

time

parameters

displayed

in the

*5

Mode are

given

in

Table

1.2-1.

1-2

The

21X

powers-up

with

hours

and

minutes

set

to 0 and the day

and

year

set for the

date that

the PROMs were

first

released

by Campbell

Scientific. To

set

the

year,

day, or time, enter

the

*5

Mode

and advance to

display the

appropriate value.

Key in the

desired number

and

enter the value by

pressing

A.

When

a

value

for

hours

and

minutes

is

entered, the

seconds are set

to zero and current time is

again displayed.,

To exit the

"5

Mode,

press

*.

When

the time is

changed, a

partial

recompile i

done

automatically to

resynchronize

program

execution

with

real

time.

The resynchronization

process

can change the interval

of a

pulse

rate

measurements

for one execution

interval

as

explained in the PULSE

COUNT

Instruction

3

Section 9.

TABLE 1.2-1.

Sequence

of

Time

in

*5

Mode

Key

*5

A

A

A

Display

ID:DATA

:HH:MM:SS

05:XX

05:XXXX

05:HH:MM:

Description

Display

current time

Display/enter

year

Display/enter day

of

hours:

1.3

DISPLAYING AND ALTERING IN

MEMORY

OR FLAGS

.

*6

MODE

The

*6

Mode

is used to display

or

change lnput

Storage values

and

to toggle

and

display

user

flags. lf

the

*6

Mode

is

entered

immediately

following

any changes in

program

tables

or the

*4

Mode, the

programs

will

be compiled and

execution will begin.

When

the

*6

Mode

is

used

to compile data

values

contained in Input

Storage,

the

state of

flags,

control

ports,

and the timer are

UNALTERED.

Compiling always

zeros

Intermediate

Storage.

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