6SEQUENCE PROGRAM USED FOR POSITIONING CONTROL

6.5.6 Stop program

MELSEC-Q

The axis stop signal [Y4, Y5, Y6, Y7] or a stop signal from an external source is used to stop the control.

Create a program to turn ON the axis stop signal [Y4, Y5, Y6, Y7] as the stop program.

The process for stopping control is explained below.

Each control is stopped in the following cases.

(1)When each control is completed normally.

(2)When the drive unit READY signal is turned OFF.

(3)When a PLC CPU error occurs

(4)When the PLC READY signal is turned OFF.

(5)When an error occurs in QD75.

(6)When control is intentionally stopped

(Stop signal from PLC CPU turned ON, stop signal from peripheral devices)

The stop process for the above cases is shown below.

(Excluding item (1) above "When each control is completed normally".)

 

[1]

Stop process

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Axis

 

 

 

 

 

Stop process

 

 

 

 

 

M code

operation

OPR control

 

 

 

Manual control

Stop cause

Stop

ON

 

status

Machine

 

 

 

 

Major

High-level

JOG/

Manual

 

 

 

 

 

 

 

axis

signal

(

Md.26

)

Fast OPR

positioning

positioning

pulse

 

 

 

after stop

 

after

OPR

 

control

 

control

control

Inching

generator

 

 

 

 

control

 

 

operation

 

 

 

 

 

 

 

 

 

 

 

operation

 

 

 

 

stopping

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Drive unit

Each

No

During

 

 

 

 

 

 

 

 

Deceleration

Forced stop

READY signal

Immediate stop

 

 

 

 

axis

change

error

 

 

 

 

stop

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hardware stroke

 

 

 

 

 

Deceleration stop/sudden stop

 

 

Deceleration

Fatal stop

limit upper/lower

Each

No

During

(Select with "

 

 

Sudden stop group 1 sudden stop

 

Pr.37

(Stop group 1)

limit error

axis

change

error

selection".

 

 

 

 

 

 

 

stop

 

 

 

 

 

 

 

 

occurrence

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLC CPU error

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

occurrence

 

change

 

 

 

Delegation stop/sudden stop

 

 

 

Emergency stop

PLC READY

 

Turns

During

 

 

Deceleration

 

(Select with "

 

 

Sudden stop group 2 sudden stop

All axes

 

Pr.38

(Stop group 2)

signal OFF

 

OFF

error

selection".

 

 

 

 

 

 

 

stop

 

 

 

 

 

 

 

 

 

Error in test

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mode

 

change

 

 

 

 

 

 

 

 

 

 

 

 

 

Axis error

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Relatively safe

detection (Error

 

 

 

 

 

 

 

 

 

 

 

 

 

 

other than stop

Each

No

During

 

 

 

 

 

 

 

 

 

stop

 

 

 

 

 

 

 

 

 

group 1 or 2)

axis

change

error

 

 

 

 

 

 

 

 

 

(Stop group 3)

 

 

 

 

 

 

 

 

 

"Stop" input from

 

 

 

 

 

Deceleration stop/sudden stop

 

 

 

 

 

 

 

 

 

 

 

 

 

peripheral device

 

 

 

 

 

 

 

Deceleration

 

 

 

 

 

 

(Select with "

 

 

Sudden stop group 3 sudden stop

 

 

 

 

 

 

 

Pr.39

 

"Stop signal" ON

 

 

During

 

stop

 

 

 

selection".

 

 

 

 

 

 

 

 

from external

 

 

 

 

 

 

 

 

 

 

 

 

 

stop

 

 

 

 

 

 

 

 

 

Intentional stop

source

Each

No

 

 

 

 

 

 

 

 

 

(during

 

 

 

 

 

 

 

 

 

(Stop group 3)

"Axis stop signal"

axis

change

 

 

 

 

 

 

 

 

 

standing

 

 

 

 

 

 

 

 

 

 

ON from PLC

 

 

by)

 

 

 

 

 

 

 

 

 

 

CPU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Mitsubishi Electronics QD75P, QD75D user manual Stop program, Stop process