Campbell 21X Betreibershandbuch PDF herunterladen (Seite 41)

location is updated

by an

llQ Instruction.

suppose

a temperature

is initiated by

Table 1

which

has

an

intervalof 1 second.

The

every

10

mi are

in

Table

2 which

has

an

of

10

seconds.

The

execution

10 minute

period,

but the

average

will be

the

result of only 60

of those

measurements

because

the instruction to

average

is executed

only

one

tenth as

often as the

instruction

to

make

the measurement.

occurs only

when

the

Output

Flag

is set

3.7.1). The Output

Flag,

Flag

0, is at

desired intervals

or in

response

to

specified

by

using

an appropriate

Program

lnstruction

(Section

1 1

).

3.7 USE

OF

FLAGS:

OUTPUT

AND

PROGRATT'I

CONTROL

There

are 1Q flags

which may

be used

in 21X

programs.

wo of the flags

have functions with

Output

Instructions: Flag

0 controls

final

and

data storage, and

Flag

9

can

disable

processing.

Flags 1-8

may be

as desired

in

programming

the

and

9 are automatically

set

low

al

of the

program

table. Flags

1-8

21X.

Flags

the

begin

SECTION

3. INSTRUCTION

SET

BASICS

data

is called an

output array.

The Output

Flag

is set

according

to time or

event dependent

intervals using

Program Control

Instructions

specified

by

the user.

The Output

Flag

is

set

low at the beginning

of each

table.

Each

group

of Output

Processing

Instructions

creating an

output

array must

be

preceded

by a

Program Control

Instruction

that

sets

the Output

Flag.

Output

is

most

often desired

at fixed

intervals;

this

is accomplished

with

Instruction 92,

lt

Time,

which checks

the clock to

see if it is

X minutes

into a

Y

minute

interval.

lf the

time

condition

is

met, a

command

is

executed. Output

at the

beginning of

the

interval by

making

Parameter

1,

time

into

the

interual, 0.

Parameter

2, the time

interual

in

minutes,

is how

often output

will

occur;

i.e.,

the

Output Interual.

Enter

10

for

parameter

3, the

command

code, to set

Flag 0

high.

lnstruction 92 is followed

in the

program

table

by the Output

Instructions

which

define the

output

array desired.

The time interval

is

synchronized

to

24 hour

time;

output

will occur on

each integer

multiple

of the

Output

Interval starting

trom

midnight

(0

minutes).

lf the

Output Interval

is not an even

divisor

of 144O

minutes

(24

hours), the

last

output

interval of

the

day

will be less than the

specified

time

interval. Output

will occur at

midnight and

will resume synchronized

to

the

new day.

NOTE:

lf the Output

Flag is already

set high and

the test condition

of

a

subsequent

Program

Control

Instruction

acting on the

flag fails,

the flag

is set

low. This feature

eliminates

having to enter another

instruction to

specifically

reset the

Output Flag

at

the

end

of

an output

array before

proceeding

to another

group

of

Output Instructions

with

a

different

output interval

(see

example

in OV4.3).

3.7.2

THE

INTERMEDIATE

PROCESSING

DISABLE

FLAG

The Intermediate

Processing Disable

Flag,

9,

suspends

intermediate

processing

when

For

remaln

Control

the

*6

untilacted

on

by

a Program

or

until

manually toggled

from

Flag

O

Flag

1

Flag

9

TABLE 3.7-1.

Flag

Description

-

Output

Flag

to8

-

UserFlags

-

lntermediate

Processing

Disable Flag

Flags

are

sqt

with Program

Control

Instructions.

The Output

Flag,

Flag

0, and

the

intermediate

processing

disable

flag, Flag

9, will always be

set

low

if

thp set

high condition

is not

met. The

status

of flags

1-8 are not changed

if a

conditional test

is false.

3.7.1

THE OUTPUT

FLAG

A set of

propessed

data

values is

placed

in

Final

Stora$e

by Output

Processing

lnstructions

when the

Qutput

Flag, Flag

0,

is

set

high. This

set

of

I

Flag

it is

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