Panasonic FP-E Programming Manual page 350

High−level Instructions
Precautions during programming
If the result of an arithmetic operation instruction does not fall within the range of values which can be
handled, an overflow will result.
Under normal circumstances, do not allow an overflow to occur.
If the operation result accidentally overflows, use of the F36 (D+1) instruction (32-bit data increment) is
recommended.
If an overflow occurs, the carry flag (special internal relay R9009) will turn on.
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
・= flag (R900B):
・Carry flag (R9009): Turns on for an instant when the calculated result exceeds the range of 16-bit
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Turns on and stays on when the area specified using the index modifier
exceeds the limit.
Turns on for an instant when the area specified using the index modifier
exceeds the limit.
Turns on for an instant when the calculated result is recognized as "0".
data (overflows).