Panasonic FP-E Programming Manual page 1008

High−level Instructions
Specifying the integer device with [S1], [S2] and [S3], the integer data is internally converted to real numbers
before operations continue.
When the constant K is specified in S1, S2 and S3, the operations are the same as when a integer device is
specified.
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
3 − 744
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Turns on and stays on when:
− The area specified using the index modifier exceeds the limit.
− If data other than real number data are specified in "S1+1, S1", "S2+1, S2",
and "S3+1, S3".
− (S2+1, S2) > (S3+1, S3).
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", "S2+1, S2",
and "S3+1, S3".
− (S2+1, S2) > (S3+1, S3).