Axis AX-906 Guide de l'utilisateur télécharger pdf (Page 9)

Sequence

Selection

CHAPTER

4.

APPLICATION

DESIGN

65

It

Is

a good practise to erase

the

sequence with

the

XE

command

before defining

the

sequence

with

the

XD

command.

To

begin

the

definition of a sequence.

enter

the

XD

command

immediately followed

by

sequence

identifier

number

(1

to

7)

and

a delimiter (pressing

the

space

bar

or

the

carriage

return

key). The XT

command

ends

the

sequence

definition

and

automatically

loads

the

sequence

into

the

AX's

EEPROM. All

commands

entered

after

the

XD

command

and

before

the

XT

conunand

are

executed

when

the

sequence

Is

run.

An

example

Is

provided below.

Command

XE1

X01

MN

A2

V1"

0128""

G

H

G

Xl

XR1

pescription

Erases Sequence 1

Begins definition of sequence 1

Sets move

to

normal mode

Sets acceleration to 2 revs/sec

2

Sets velocity to 1 0 rps

Sets distance to 12,800 steps

Executes the move

(Go)

Reverses direction

Executes the move

(Go)

Ends definition of sequence 1

Runs Sequence 1

Once

you

define a sequence. it

cannot

be

redefined until you

delete

it. You

can

delete a sequence from EEPROM

by

entering

the

XE

command

immediately followed

by

a

sequence

identifier (1 to

7)

and

a delimiter. You

may

then

redefine

that

sequence into EEPROM. You

can

issue

the

Sequence

Status

Definition

(XSD)

command

(preceded

by

a device address)

to

verify

if

the

last

sequence

definition

was

successful. The

possible

responses

seen

on

your

terminal are 0, 1.

or

2.

A 0

means

the

sequence

was

successfully defined. A 1

means

the

sequence

already

exists with

the

number

you

have specified.

A 2

means

there

was

not enough

space

in

the

sequence buffer

for

that

sequence.

To

check

the

status

of a sequence. issue

the

Sequence

Status

(XSS)

command. This

command

must

be

preceded

by

a device

address

and

followed immediately

by

the

number

(1 to

7)

of

the

sequence

and

a delimiter. The possible

responses

are

0

(Empty). 1 (Bad checksum), or 3

(O.K.).

If

you wish

to

check

the

contents

of a sequence.

enter

the

XU

command.

For

example,

issuing

the

lXUl

command

causes

the

AX

to

send

the

contents

of sequence

number

1 to

the

computer

terminal's

screen.

The

1 preceding

the

XU

command

Is

the

device

address

which

must

be

present

since

the

XU

command

Is

a device-specific

command.

We

are

assuming

in

this

example

that

the

AX

Is

set

up

at

device

address

1.

After

you

define

the

sequences

over

the

RS-232C interface, you

can

execute

the

sequences

by

using

one

of

the

following

modes

of

operation:

•

Stand-alone

Operation

•

Host

Computer

Operation

•

Programmable

Logic

Controller

(PLC)

Operation

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