Panasonic FP Series Programming Manual page 415

Arithmetic instructions
This result is then compared to the ASCII BIN code of the next character, i.e. "1".
Sign for comparison
Exclusive OR result
1
Next exclusive OR
And so on until the final character is reached.
LD
ST
IF start THEN
F70_BCC( s1_Control:= BCC_Calc_Methode,
s2_Start:= Adr_Of_VarOffs( Var:= ASCII_String,
Offs:= 2),
s3_Number:= LEN( ASCII_String),
d=> BCC);
END_IF;
414
ASCII BIN code
00010101
00110001
00100100