9 MAJOR POSITIONING CONTROL

MELSEC-Q

Position-speed switching signal setting

The following table shows the items that must be set to use the external command signals (CHG) as position-speed switching signals.

 

 

Setting item

Setting

Setting details

Buffer memory address

 

 

value

Axis 1

Axis 2

Axis 3

Axis 4

 

 

 

 

 

 

 

 

 

 

 

 

External

 

Set the "2: speed-position and

 

 

 

 

 

 

 

 

 

command

 

 

 

 

 

 

Pr.42

 

2

position-speed switching

62

212

362

512

 

 

function

 

 

 

 

 

 

requests".

 

 

 

 

 

 

 

 

 

selection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

External

 

Set "1: Validate external

 

 

 

 

 

 

Cd.8

 

 

command

1

1505

1605

1705

1805

 

 

 

 

command".

 

 

 

 

 

valid

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to Section 5.2 "List of parameters" and Section 5.7 "List of control data" for information on the setting details.

Changing the speed control command speed

In "position-speed switching control", the speed control command speed can be changed during the position control.

(1)The speed control command speed can be changed during the position control of position-speed switching control.

A command speed change request will be ignored unless issued during the position control of the position-speed switching control.

(2) The "new command speed" is stored in "

Cd.25

Position-speed switching

control speed change register" by the sequence program during position control.

This value then becomes the speed control command speed when the position-speed switching signal turns ON.

Position Speed

control control

Position-speed switching control start

Position control start

t

Speed change

enable

 

 

 

 

 

ON

Position-speed switching

OFF

 

 

 

 

 

 

 

 

 

 

 

 

signal

 

 

 

 

 

 

Setting after the position-speed

 

 

 

 

 

 

 

Cd.25 Position-speed

 

 

 

 

 

 

switching signal ON is ignored.

 

 

 

 

 

 

 

 

 

0

V2

 

V3

switching control

 

speed change register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V2 becomes the speed control command speed.

Position-speed switching latch flag

Md.31 Status: b5

Stop signal

ON

OFF

ON

OFF

Fig. 9.20 Speed control speed change timing

9 - 102

Page 402
Image 402
Mitsubishi Electronics QD75P, QD75D Position-speed switching signal setting, Changing the speed control command speed