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MELSEC-Q
15 TROUBLESHOOTING
Related buffer memory
address
Axis 1 Axis 2 Axis 3 Axis 4
Set range
(Setting with PLC program)
Remedy
78 228 378 528
<OPR retry>
0, 1
• Validate the home position return (OPR) retry function
(set value: 1). (Refer to Section 12.2.1)
• Move the workpiece from the current position (on
home position (OP) ) using the manual control
operation (refer to chapter 11), then carry out an
original position return again.
74
75
224
225
374
375
524
525
• Lower the home position return (OPR) speed.
• Increase the dog signal input time.
(Refer to Section 8.2.3)
74
75
224
225
374
375
524
525
• Lower the home position return (OPR) speed.
• Input external zero signals during the movement at a
creep speed.
(Refer to Section 8.2.5)
74
75
224
225
374
375
524
525
<OPR speed>
1 to 50000000 [PLS/s]
1 to 2000000000 [mm/min or others]
79 229 379 529
<OPR dwell time>
0 to 65535
• Lower the home position return (OPR) speed.
• Increase the OPR dwell time.
(Refer to Section 8.2.4)
80
81
230
231
380
381
530
531
<Movement amount setting after
near-point dog ON>
0 to 2147483647
74
75
224
225
374
375
524
525
<OPR speed>
1 to 50000000 [PLS/s]
1 to 2000000000 [mm/min]
• Calculate the movement distance using a speed limit,
home position return (OPR) speed, and deceleration
time, and set the movement amount after near-point
dog ON so that the distance becomes a deceleration
distance or longer.
• Lower the home position return (OPR) speed.
• Adjust the near-point dog position so that the
movement amount after near-point dog ON becomes
longer. (Refer to Section 8.2.4, 8.2.5)
1500 1600 1700 1800
<Positioning start No.>
1 to 600
7000 to 7004
9001 to 9004
Execute the machine home position return (OPR)
(positioning start No. 9001). (Refer to Section 8.2)
1500 1600 1700 1800
<Positioning start No.>
1 to 600
7000 to 7004
9001 to 9004
Start the machine home position return (OPR)
(positioning start No. 9001) again. (Refer to Section
8.2)
— — — — —
Turn the motor more than one revolution using JOG or
positioning operation.
— — — — — Execute the home position return (OPR) again.
— — — — — Execute the home position return (OPR) again.
— — — — —
• Review the wiring. (Refer to Section 12.6)
• Review the PLC program.
— — — — —
• Review the wiring. (Refer to Section 12.6)
• Review the PLC program.
• Review the dedicated instruction parameters.
(Refer to Section 14.3)