Campbell 21X Manual do Operador descarregar pdf (Página 81)

13: P I

End

Table 1

I

*

Al Mode

10 Memory Allocation

01:

35

|

Input Locations

02: 641

Intermediate

Locations

8.4

SUB 1

MINUTE OUTPUT

INTERVAL

SYNCHED

TO REAL

TIME

Instruction

92

has

1 minute

resolution. lf

processed

oirtput

is

required on

an

interval

less

than

1

minutb,

Instructions

18 and 89

can

be

used to set tfe

Output

Flag on a shorter

interval.

l

Instruction

1p takes time

(tenths

of

seconds

into

minute, min{tes

into day, or

hours

into

year),

performs

a

$odulo

divide

by a

user

specified

value and lo{ds

it into an

input location.

When the modulo

divisor

divides

evenly into the

interval, one,gets

a counter

in an

input

location

that

goes

to

0

on a

periodic

interual. In this

example, terlths

of seconds

into the minute

is

modulo

divi{ed

by 300.

The

counter counts up

to 295

then

$oes

to

0

(i.e.,

every

30

seconds;

tenths of sedonds

into minute

has

a

resolution

of 0.1

seconfls.)

Instruction 89

is used to set

the Output Flag

when the

of seconds

counter is

less than

interual, 0.5 seconds).

With

5

(the

SECTION 8.

PROCESSING

AND PROGRAM

CONTROL EXAMPLES'

by the execution

interval, but

some

longer

interval.

In

this

example a temperature

(type

E

thermocouple)

is measured every

0.5

seconds

and the

average

output

every

30 seconds.

Input

Location

Assignments:

1:TEMP

DEG

C

10:30 SEC

0

*1

01: .5

01: P18

01: 0

Table 1

Programs

Sec. Execution

Interval

Time

Tenths of

seconds into

minute

(maximum

600)

Mod/by

Loc

[:30

SEC

0

]

Panel

Temperature

Loc

[:REF

TEMP

J

Thermocouple Temp

(DIFF)

Rep

5 mV

fast Range

lN

Chan

Type E

(Chromel-Constantan)

Ref

Temp Loc REF TEMP

Loc

[:TC

TEMP

]

Mult

Offset

lf X<=>F

X Loc 30 SEC 0

02:

03:

02:.

01:

03:

01:

02:

03:

o4:

05:

06:

07:

08:

o4;

01:

02:

03:

o4:

300

10

P17

1

P14

1

11

2

2

1

2

1

0

P89

10

4

10

this

short

when

the

the

Output

Flag

could

be set

counter

equaled 0.

However,

if

18 followed

a series

of

instructions

that

took than

0.1 seconds to execute

or

was in Tabld 2, executed

at

the same interval as

Table

1, the time

at which

seconds

or

inore

beyond

the

modulo divisor.

The

value

output

would not equal 0. Setting

the

Output Flag

when the seconds

counter is less

than

the exdcution

interval

avoids this

problem.

Using

Instrubtion

18 keeps

the output interual

synchronized

with real time.

lf a

counter

incremented

within the

program

was

used

to

determine

wlhen to set

the Output Flag,

output

would

depefrd

on

the number

of times the table

was executdd.

The actualtime

of

output

would

depend on

When

the

program

was

actually

compiled arid started

running.

lf the

table

overran

its

Execution

interval(Section 1.1.1),

the

output interVal

would

not be the

count multiplied

.5F

Set high

Flag

0

(output)

Average

Rep

Loc TC

TEMP

End

Table

1

05: P71

01: 1

02: 2

06:

P

8.5 SDM.AO4

ANALOG OUTPUT

MULTIPLEXER TO STRIP CHART

This

example

illustrates

the use of the SDM-AO4

4 ChannelAnalog Output

Multiplexer

to

output

4

analog

voltages to strip

chart.

8-5

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 190 191

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