Positioning controller Components of Positioning Control and their Roles
FX Positioning Control Systems 3 - 7
DOG search function
In some PLC models, if the zero point return function is performed while the workpiece is stopped
beyond the DOG switch, the machine moves until the limit switch is actuated, changes direction, then
returns to the zero point again (DOG search function, zero point return retry function).
Fig. 3-6:
Positioning pattern of
DOG search function
313020da.eps
Limit
switch
DOG
switch
Initial
position
Zero point
Escape operation
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