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15 TROUBLESHOOTING
Related buffer memory
address
Axis 1 Axis 2 Axis 3 Axis 4
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78
228
378
528
Set range
(Setting with sequence program)
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<OPR retry>
0, 1
• Check that there is no influence from noise.
• Check hardware for possibility of fault.
• Review the sequence program which turns ON/OFF
PLC READY signal (Y0).
• Cancel the error with an axis error reset.
(Refer to Section 15.1[3])
Check the drive unit power, wiring with the drive unit,
and connection of connectors, and cancel the error
with an axis error reset. (Refer to Section 15.1[3])
Check that there is no error on the personal computer
side I/F to which a cable is connected.
After making an axis error reset (refer to [3] in Section
15.1), perform manual control operation (refer to
Chapter 11) to move the axis to the other position in
order that the upper limit signal (FLS) will not turn OFF.
After making an axis error reset (refer to [3] in Section
15.1), perform manual control operation (refer to
Chapter 11) to move the axis to the other position in
order that the lower limit signal (RLS) will not turn OFF.
Check whether the stop commands (output
signals/external inputs to QD75) are turned ON or
OFF. Turn OFF the ON commands.
• Output signals to QD75
Axis 1: Y4, Axis 2: Y5, Axis 3: Y6, Axis 4: Y7
• External input
Connectors for external device connection:
Stop signals (STOP)
After confirming the stop command status, cancel the
error with an axis error reset. Then turn ON a start
signal. (Refer to Section 15.1[3])
Turn ON the PLC READY signal (Y0) with the BUSY
signals of all axes OFF.
• Validate the OPR retry function
(set value: 1). (Refer to Section 12.1.1)
• Move the workpiece from the current position (on OP)
using the manual control operation (refer to Chapter
11), then carry out a machine OPR again.
15 - 7
MELSEC-Q
Remedy
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Troubleshooting
