Campbell Scientific CR10 CR10 Measurement and Control - Page 53

The

instructions

to

output the average

temperature every

10 minutes

are

in

Table

2

which

has an

execution

interval

of

10

seconds.

The temperature

will

be measured 600

times

in

the

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.

lntermediate

Processing

can

be disabled by

setting Flag

9

which prevents

Intermediate

Processing without actually skipping over

the

Output

Instruction

(Section

1.2).

All

of

the Output Processing

lnstructions store

processed data values when and only when

the

Output

Flag is set

(Section

1.2).

The

Output

Flag (Flag

0)

is

set at desired interuals or

in

response to certain conditions by using an

appropriate

Program

Control

Instruction

(Section

11).

3.7

USE

OF

FLAGS:

OUTPUT

AND

PROGRAM CONTROL

There

are

10

flags

which

may

be

used in CR10

programs. Two

of

the

flags

are dedicated

to

specific

functions:

Flag

0

causes

Output

Processing Instructions to write

to

Final

Storage,

and

Flag

9

disables

intermediate

processing.

Flags 1-8 may be used as desired

in programming

the

CR10.

Flags 0 and

9

are

automatically set low

at

the

beginning of the

program

table.

Flags 1-8 remain unchanged

untilacted

on by

a

Program

Control

Instruction

or

until manually toggled from

the

*6

Mode.

TABLE

3.7-1.

Flag

Description

SECTION

3.INSTRUCTION

SET

BASICS

3.7.1

THE OUTPUT FLAG

A

group

of

processed data

values

is placed

in

Final Data Storage by

Output

Processing

Instructions when

the Output

Flag (Flag

0)

is

set

high.

This group of

data

is

called

an

Output

Array.

The Output

Flag

is

set

using Program

Control

Instructions according to

time

or event

dependent interuals specified by

the

user.

The

Output

Flag

is

set

low

at

the

beginning of each

table.

Output

is most often desired

at

fixed

intervals;

this

is acoomplished

with

Instruction

92,

lf Time.

Output

is usually desired

on

the even

interval,

so Parameter

1,

time

into

the

interval, is

0.

The

time

interval (Parameter

2), in

minutes, is how

often output will

occur;

i.e.,

the Output

lnterval.

The

command

code

(Parameter

3) is

10,

causing

Flag

0

to

be

set

high.

The

time

interual

is synchronized to

24

hour

time;

output will

occur on

each integer

multiple

of

the

Output

Interualstarting from

midnight (0

minutes).

lf

the

Output lnterval

is not an even divisor of

1440 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.

Instruction 92

is

followed

in

the

program table

by

the Output

Instructions which define

the

Output Array desired.

Each group of

Output Processing

Instructions

creating an Output Array is preceded by

a

Program

Control

Instruction that sets

the

Output

Flag.

NOTE:

lf

the Output

Flag is already set high

and the test condition of a

subsequent

Program

Control

lnstruction acting

on

Flag

0

fails, the

flag

is set

low.

This eliminates

entering

another

instruction to specifically

reset the

Output

Flag before

proceeding

to

another group of

Output

lnstructions

with

a

ditferent

output

interval.

3.7.2

THE INTERMEDIATE

PROCESSING

DISABLE FLAG

The

Intermediate Processing Disable Flag (Flag

9)

suspends

intermediate processing when it

is

set

high.

This

flag

is used

to

restrict sampling

for

averages,

totals,

maxima, minima, etc.,

to

times when certain

criteria are

met.

The

flag

is

automatically set low

at

the

beginning

of

the

program table.

Flag

0

Flag

1

to

8

Flag

9

-

Output

Flag

-

User Flags

-

IntermediateProcessing

Disable Flaq

Flags are set

with

Program

Control

Instructions.

The

Output

Flag (Flag 0) and

the

intermediate

programming disable

flag

(Flag 9)

willalways

be

set low

if

the

set high condition

fails.

The status

of

flags

1-8

does

not change when a conditional

test

is

false.

3-3

Campbell Scientific CR10 CR10 Measurement and Control - Page 53

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