Panasonic FP-E Programming Manual page 1006

High−level Instructions
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
3 − 742
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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.
− If data other than real number data are specified in (S1+1, S1) and (S2+1,
S2).