Panasonic FP-E Programming Manual page 563

Description
Counts the number of bits in the on (1) state in the 16-bit data specified by S. The counted result (number of on
(1) bits) is stored in the 16-bit area specified by D.
The results are stored in decimal number.
Flag conditions
・Error flag (R9007):
・Error flag (R9008):
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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.
High−level Instructions
3 − 299