Справочник Пользователя для Mitsubishi Electronics QD75MH2

 
 

 

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MELSEC-Q

 

6   PLC PROGRAM USED FOR POSITIONING CONTROL 

 

[1]   Starting by inputting positioning start signal 

 

 Operation when starting 

 

(1)  When the positioning start signal turns ON, the start complete signal and 

BUSY signal turn ON, and the positioning operation starts. 
It can be seen that the axis is operating when the BUSY signal is ON. 

(2)  When the positioning start signal turns OFF, the start complete signal also 

turns OFF. 
If the positioning start signal is ON even after positioning is completed, the 
start complete signal will remain ON. 

(3)  If the positioning start signal turns ON again while the BUSY signal is ON, the 

warning "operating start (warning code: 100)" will occur. 

(4)  The process taken when positioning is completed will differ according to case 

(a) and (b) below. 

 

(a)  When next positioning is not to be carried out 

•

  If a dwell time is set, the system will wait for the set time to pass, and then 

positioning will be completed. 

•

  When positioning is completed, the BUSY signal will turn OFF and the 

positioning complete signal will turn ON. However, when using speed 
control or when the positioning complete signal ON time is "0", the signal 
will not turn ON. 

•

  When the positioning complete signal ON time is passed, the positioning 

complete signal will turn OFF. 

 

(b)  When next positioning is to be carried out 

•

  If a dwell time is set, the system will wait for the set time to pass. 

•

  When the set dwell time is passed, the next positioning will start. 

 

OFF

ON

OFF

ON

OFF

ON

OFF

ON

V

t

OFF

ON

Positioning start signal
        [Y10, Y11, Y12, Y13]

Start complete signal 
        [X10, X11, X12, X13]

BUSY signal

[XC, XD, XE, XF]

Positioning complete  signal   

[X14, X15, X16, X17]

Positioning

All axis servo ON
        [Y1]

Dwell time

 

 

Fig. 6.3 ON/OFF timing of each signal at start of positioning