Yaskawa Ladder Works Programming Manual - Manual (Page 22)

2.2 ADDITION Instruction (ADD)
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[Program Example ]
Addition of integer type values
Addition of real number type values
Notes: In the case of double-length integer type values, an operation using addition and
subtraction instructions (+, –, ++, --) will be a 32-bit operation. However, when an
addition or subtraction instruction is used in a remainder correction operation (where a
multiplication instruction (×) is the immediately preceding instruction and a division
instruction (÷) is the immediately subsequent instruction), the operation will be a 64-bit
operation.