Panasonic FP-E Programming Manual page 700

High−level Instructions
Description
The square root of 32-bit data specified by S1 is calculated and stored in the 32-bit area specified by D.
In the result, the digits beyond the decimal point are disregarded.
√(S+1, S) → (D+1, D)
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
3 − 436
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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.
− The data specified by S is a negative value.