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MELSEC-Q

 

6   PLC PROGRAM USED FOR POSITIONING CONTROL 

 

[3]   Order of priority for stop process 

The order of priority for the QD75 stop process is as follows. 

 

Deceleration stop < Sudden stop < Servo OFF 

 

(1)  If the deceleration stop command ON (stop signal ON) or deceleration stop 

cause occurs during deceleration to speed 0 (including automatic 
deceleration), operation changes depending on the setting of "

Cd.42

Stop 

command processing for deceleration stop selection". 

(a) Manual control 

Independently of the

Cd.42

setting, a deceleration curve is re-processed 

from the speed at stop cause occurrence. 

(b) OPR control, positioning control 

•

 When

Cd.42

= 0 (deceleration curve re-processing): 

A deceleration curve is re-processed from the speed at stop cause 
occurrence. 

•

 When

Cd.42

= 1 (deceleration curve continuation): 

The current deceleration curve is continued after stop cause occurrence.  
(For details, refer to Section 12.7.10 "Stop command processing for 
deceleration stop function".) 

(2)  If the stop signal designated for sudden stop turns ON or a stop cause occurs 

during deceleration, the sudden stop process will start from that point. 
However, if the sudden stop deceleration time is longer than the deceleration 
time, the deceleration stop process will be continued even if a sudden stop 
cause occurs during the deceleration stop process. 

 

Positioning speed

Deceleration 
stop process

Stop

Sudden 
stop cause

Sudden stop deceleration process

Deceleration stop process continues Process for sudden stop

Positioning speed

Deceleration 
stop process

Stop

Sudden 
stop cause

Example

The process when a sudden stop cause occurs during deceleration stop is shown below.