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MITSUBISHI CNC
Appendix 6 Explanation of Alarms
P990 PREPRO error
Details
Combining commands that required pre-reading (nose R offset, corner chamfering/corner rounding,
geometric I, geometric IB, and compound type fixed cycle for turning machining) resulted in eight or
more pre-read blocks.
Remedy
- Delete some or all of the combinations of commands that require pre-reading.
IV - 144
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