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MELSEC-Q
12 CONTROL SUB FUNCTIONS
(2) OPR retry operation when the workpiece is outside the range between the
upper and lower limits.
1) When the direction from the workpiece to the OP is the same as the "
Pr.44
OPR direction", a
normal machine OPR is carried out.
Pr. 44 OPR direction
Hardware upper limit switch
Hardware lower limit switch
Movement range
Machine OPR start
OP
Zero signal
Near-point dog
2) When the direction from the workpiece to the OP is the opposite direction from the "
Pr.44
OPR
direction", the operation carries out a deceleration stop when the near-point dog turns OFF, and
then carries out a machine OPR in the direction set in "
Pr.44
OPR direction".
Pr. 44 OPR direction
Near-point dog
Hardware upper limit switch
Hardware lower limit switch
Movement range
Machine OPR start
OP
Zero signal
In the above example 1) and 2), "0: Positive direction" is set in "
Pr.44
OPR direction"
REMARK
•
When the "0: Positive direction" is selected in "
Pr.44
OPR direction", the upper limit switch is
set to the limit switch in the OPR direction.
•
When the "1: Negative direction" is selected in "
Pr.44
OPR direction", the lower limit switch is
set to the limit switch in the OPR direction.
•
If inverting the install positions of upper/lower limit switches, hardware stroke limit function cannot
be operated properly.
If problem is found when "
Pr.114
Rotation direction selection" and the wiring for the upper/lower
limit switch are checked.
Fig. 12.2 OPR retry operation from on limit (limit signal OFF)