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12 - 9 
MELSEC-Q
 
12   CONTROL SUB FUNCTIONS 
 
[2]   Setting range for the OP shift amount  
Set the OP shift amount within the range from the detected zero signal to the 
upper/lower limit switches.  
 
Setting range of the
negative OP
shift amount
Setting range of the positive OP shift amount
Address decrease
direction 
 Upper limit switch
 Lower limit switch
Near-point dog
Pr. 44 OPR direction 
Zero signal 
Address increase
direction 
 
Fig. 12.5 Setting range for the OP shift amount 
 
 
[3]   Movement speed during OP shift 
When using the OP shift function, the movement speed during the OP shift is set 
in "
Pr.56
 Speed designation during OP shift". The movement speed during the 
OP shift is selected from either the "
Pr.46
 OPR speed" or the "
Pr.47
 Creep 
speed".  
The following drawings show the movement speed during the OP shift when a 
mechanical OPR is carried out by the near-point dog method.  
(1)  OP shift operation at the "
Pr.46
 OPR speed" 
(When "
Pr.56
speed designation during OP shift" is 0) 
 
OP
When the " Pr. 53 OP
shift amount" is positive
When the " Pr. 53 OP
shift amount" is negative
Pr. 44 OPR
direction 
Machine OPR start
Pr. 46 OPR
speed
Near-point dog
Zero signal 
 
Fig. 12.6 OP shift operation at the OPR speed