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MELSEC-Q
8 OPR CONTROL
Precautions during operation
(1) An error "Start at home position (OP) fault (error code: 201)" will occur if another
machine OPR is attempted after a machine OPR completion when the OPR retry
function is not set ("0" is set in "
Pr.48
OPR retry").
(2) Machine OPR carried out from the near-point dog ON position will start at the
"
Pr.47
Creep speed".
(3) The near-point dog must be ON during deceleration from the OPR speed "
Pr.47
Creep speed".
(4) When the stop signal stops the machine OPR, carry out the machine OPR again.
When restart command is turned ON after the stop signal stops the OPR, the error
"OPR restart impossible (error code: 209)" will occur.
(5) After the home position return (OPR) has been started, the zero point of the encoder
must be passed at least once before point A is reached.
However, if selecting "1: It is not necessary to pass through the Z phase after the
power on." with "
Pr.180
Function selection C-4", it is possible to carried out the
home position return (OPR).
The workpiece will continue decelerating and stop if the near-point dog is turned OFF
before it has decelerated to the creep speed, thus causing an error "Dog detection
timing fault (error code: 203)".
t
V
ON
OFF
ON
OFF
OFF
0
ON
Near-point dog OFF
In error
Pr. 46 OPR speed
Pr. 47 Creep speed
In OPR
Standing by
Inconsistent
Inconsistent
Value the machine moved is stored
Address at stop
Machine OPR start
(Positioning start signal)
OPR request flag
[ Md.31 Status : b3]
OPR complete flag
[ Md.31 Status : b4]
Md.26 Axis operation status
Md.34 Movement amount
after near-point dog ON
Md.20 Current feed value
Md.21 Machine feed value
Fig. 8.4 Operation when the near-point dog is turned OFF before the creep speed is reached