Panasonic FP7 Series Command Reference Manual page 649

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Flag operations
Name
SR7
SR8
(ER)
WUME-FP7CPUPGR-12
Description
To be set in the case of out-of-range in indirect access (index modification).
To be set when the slot number and/or the axis number is out of the available range.
13.15 UCLR (Error/Warning Clear)
13-27