12 CONTROL SUB FUNCTIONS

MELSEC-Q

[4]Setting the speed change function using an external command signal

The speed can also be changed using an "external command signal". The following shows the data settings and sequence program example for changing the control speed of axis 1 using an "external command signal". (In this example, the control speed is changed to "10000.00mm/min".)

(1)Set the following data to change the speed using an external command signal.

(Use the start time chart shown in section (2) below as a reference, and set using the sequence program shown in section (3).)

 

 

 

 

 

Setting

 

Buffer memory address

 

 

 

Setting item

Setting details

Axis

Axis

Axis

Axis

 

 

 

value

 

 

 

 

 

 

1

2

3

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

External command

 

 

 

 

 

 

 

Pr.42

1

Set "1: External speed change request".

62

212

362

512

 

 

 

 

function selection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

External command

 

 

 

 

 

 

 

Cd.8

 

1

Set "1: Validate the external command".

1505

1605

1705

1805

 

 

 

valid

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1514

1614

1714

1814

 

Cd.14

 

New speed value

1000000

Set the new speed.

 

 

1515

1615

1715

1815

 

 

 

 

 

 

 

Refer to Section 5.7 "List of control data" for details on the setting details.

(2) The following shows the speed change time chart.

V

Dwell time

t

Positioning start signal

[Y10]

PLC READY signal

[Y0]

QD75 READY signal

[X0]

Start complete signal

[X10]

BUSY signal

[XC]

Positioning complete signal

[X14]

Error detection signal

[X8]

External command signal

 

Pr. 42 External command function selection

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Md.40 In speed change processing flag

 

 

 

0

 

0

 

 

 

 

 

 

 

 

 

Cd. 8 External command valid

0

 

1

 

0

 

 

 

 

 

 

 

 

 

 

 

 

Cd. 14 New speed value

 

 

 

1000000

 

 

 

 

Fig. 12.27 Time chart for changing the speed using an external command signal

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Mitsubishi Electronics QD75D, QD75P Pr.42 Set 1 External speed change request, Cd.8 Set 1 Validate the external command