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12 - 8 
MELSEC-Q
 
12   CONTROL SUB FUNCTIONS 
 
12.2.2 OP shift function  
When a machine OPR is carried out, the OP is normally established using the near-
point dog, stopper, and zero signal. However, by using the OP shift function, the 
machine can be moved a designated movement amount from the position where the 
zero signal was detected. A mechanically established OP can then be interpreted at 
that point.  
 
The details shown below explain about the "OP shift function".  
  [1] Control details 
  [2] Setting range for the OP shift amount  
  [3] Movement speed during OP shift 
  [4] Precautions during control 
  [5] Setting the OP shift function 
 
[1]   Control details 
The following drawing shows the operation of the OP shift function.  
 
Machine OPR start 
Pr.53 OP shift amount 
Speed selected by the" Pr. 56
Speed designation during
OP shift"
Pr.47  Creep speed
Pr. 44  OPR direction 
Near-point dog
Pr. 46 OPR speed 
Zero signal 
 
Fig. 12.4 OP shift operation