Panasonic FP-E Programming Manual page 109

Values when overflow or underflow occurs
Numerical value handled by the FP series programmable controller all form a loop
joined at the maximum value and the minimum value as shown below.
16−bit binary operation
K 32767
Max. value
K 1
K 0
K −1
Min. value
K-32768
Underflow
Example 1: For K32767 + K1 (overflow)
The operation result is K−32768 and the carry flag turns on.
Example 2: For K−32768 − K1 (underflow)
The operation result is K32767 and the carry flag turns on.
4−digit BCD code operation
Overflow
Max. value H 9999
Min. value
H
Underflow
Example 1: For H9999 + H1 (overflow)
The operation result is H0 and the carry flag turns on.
Example 2: For H0 − H1 (underflow)
The operation result is H9999 and the carry flag turns on.
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Overflow
H 7FFF
The max. value
H 0001
links with the min.
H 0000
value.
H FFFF
H 8000
The max. value
links with the min.
value.
0
1.5 Data Ranges Which can be Handled in the PLC
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