11 MANUAL CONTROL

11.3.4 Creating a program to enable/disable the inching operation

MELSEC-Q

A sequence program must be created to execute an inching operation. Consider the "required control data setting", "start conditions", and "start time chart" when creating the program.

The following shows an example when an inching operation is started for axis 1. (The

example shows the inching operation when a "10.0 µm" is set in " movement amount".)

Cd.16

Inching

Required control data setting

The control data shown below must be set to execute an inching operation. The setting is carried out with the sequence program.

 

 

 

 

Setting

 

Buffer memory address

 

 

Setting item

Setting details

Axis

Axis

Axis

Axis

 

 

value

 

 

 

 

 

1

2

3

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set the setting value so that the command

 

 

 

 

 

 

 

 

 

pulse is not increased larger than the maximum

 

 

 

 

 

 

 

Inching movement

100

output pulse. (The maximum output pulse is 1

1517

1617

1717

1817

 

Cd.16

 

 

 

amount

 

Mpps for QD75D : differential drive output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

system), or 200 kpps for QD75P : open

 

 

 

 

 

 

 

 

 

collector output system.)

 

 

 

 

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

Start conditions

The following conditions must be fulfilled when starting. The required conditions must also be assembled in the sequence program, and the sequence program must be configured so the operation will not start if the conditions are not fulfilled.

 

 

 

 

 

Device

 

 

Signal name

 

Signal state

 

 

 

 

 

 

 

Axis

Axis

 

Axis

Axis

 

 

 

 

1

2

 

3

4

 

 

 

 

 

 

 

 

 

PLC READY signal

ON

PLC CPU preparation completed

 

Y0

 

 

QD75 READY signal

ON

QD75 preparation completed

 

X0

 

 

Synchronization flag

ON

Accessible to QD75 buffer

 

X1

 

 

memory

 

 

 

 

 

 

 

 

 

 

 

Interface

Axis stop signal

OFF

Axis stop signal is OFF

Y4

Y5

 

Y6

Y7

 

 

 

 

 

 

 

 

Start complete signal

OFF

Start complete signal is OFF

X10

X11

 

X12

X13

signal

 

 

 

 

 

 

 

 

BUSY signal

OFF

QD75 is not operating

XC

XD

 

XE

XF

 

 

 

Positioning complete

OFF

Positioning complete signal is

X14

X15

 

X16

X17

 

signal

OFF

 

 

 

 

 

 

 

 

 

 

 

Error detection signal

OFF

There is no error

X8

X9

 

XA

XB

 

 

 

 

 

 

 

 

 

 

M code ON signal

OFF

M code ON signal is OFF

X4

X5

 

X6

X7

 

Drive unit READY signal

ON

Drive unit preparation completed

 

 

 

External

Stop signal

OFF

Stop signal is OFF

 

 

 

signal

Upper limit (FLS)

ON

Within limit range

 

 

 

 

 

 

 

 

 

 

 

 

Lower limit (RLS)

ON

Within limit range

 

 

 

 

 

 

 

 

 

 

 

 

If the PLC CPU is set to the asynchronous mode in the synchronization setting, this must be inserted in the program for interlocking. If it is set to the synchronous mode, it must not be inserted in the program for interlocking because it is turned ON when the PLC CPU executes calculation.

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Mitsubishi Electronics QD75P, QD75D user manual Creating a program to enable/disable the inching operation, Inching