Panasonic FP-E Programming Manual page 900

High−level Instructions
Precaution during programming
Even if D+1 overflows the selected area, it will still be stored, and this may corrupt the data in the leading part
of the other area. (An area overflow check is not performed.)
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
3 − 636
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Turns on and stays on when:
Turns on for an instant when:
− The area specified using the index modifier exceeds the limit.
− S1 > S2.
− The areas of S1 and S2 are different.