Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 98)

5.3 Numeric Operation Instructions
5.3.4 Subtract (SUB ( −))
5-29
Instructions
5
• Storing the Output Data in MW00000 When Input Data A Is 10.5 and Input Data B Is 10
10.5 – 10 → MW00000 = 0 (when truncating below the decimal point is set)
• Storing the Output Data in ML00000 When Input Data A in MW00002 Is -20,000 and Input Data B in
MW00003 Is 30,000
-20,000 – 30,000
→ ML00000 = -32,768*
∗ In the example given above, an underflow error occurs because both input data A and B are integers, which
limits the result to a number within the range for integers.
( 4 ) Additional Information
With integer operations, an overflow operation error occurs if the result exceeds 32,767 and an underflow operation
error occurs if the result is less than -32,768.
With double-length integer operations, an overflow operation error occurs if the result exceeds 2,147,483,647 and an
underflow operation error occurs if the result is less than -2,147,483,648.
When performing operations with different data types, the result of the operation will depend on the data type of the output reg-
ister.
Refer to 4.4.2 ( 3 ) Precautions When Using Local Registers within a User Function for details.
Normally, addition and subtraction instructions (+, –, ++, and – –) involving double-length integers are performed as 32-bit
operations.
However, these instructions are performed as 64-bit operations if they are used to correct the remainder produced by an immedi-
ately preceding MUL instruction (
×) and are immediately followed by a DIV instruction (÷).
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