6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL

MELSEC-Q

Starting conditions

To start the control, the following conditions must be satisfied.

The necessary start conditions must be incorporated in the sequence program so that the control is not started when the conditions are not satisfied.

 

Signal name

 

Signal state

 

Device

 

 

 

 

 

 

 

 

 

 

Axis 1

Axis 2

Axis 3

Axis 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLC READY signal

ON

PLC CPU preparation completed

 

 

Y0

 

 

QD75 READY signal

ON

QD75 preparation completed

 

 

X0

 

 

Synchronization flag

ON

QD75 buffer memory

 

 

X1

 

 

Accessible

 

 

 

Interface

 

 

 

 

 

 

 

 

Axis stop signal

OFF

Axis stop signal is OFF.

Y4

Y5

 

Y6

Y7

signal

 

 

 

 

 

 

 

 

M code ON signal

OFF

M code ON signal is OFF.

X4

X5

 

X6

X7

 

 

 

Error detection signal

OFF

No error is present.

X8

X9

 

XA

XB

 

BUSY signal

OFF

BUSY signal is OFF.

XC

XD

 

XE

XF

 

Start complete signal

OFF

Start complete signal is OFF.

X10

X11

 

X12

X13

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

: When the synchronous setting of the PLC CPU is made in the nonsynchronous mode, this must be provided as an interlock.

When it is made in the synchronous mode, no interlock must be provided in the program because the flag is turned ON when calculation is run on the PLC CPU.

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Mitsubishi Electronics QD75P, QD75D user manual Starting conditions