Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 69

Processing details
• These instructions subtracts the 32-bit binary data in the device specified by (s2) from the 32-bit binary data in the device
specified by (s1), and store the operation result in the device specified by (d).
(s1)
(s1)+1 (s2)+1
b31 b16 b15 b31 b16 b15
··· ··· b0 ···
123456 (BIN)
567890 (BIN) -
• If an underflow occurs in the result, the carry bit is ignored. In this case, SM700 does not turn on.
[D- instruction]
(s1)
(s1)+1 (s2)+1
b31 b16 b15 b31 b16 b15
b0
··· ··· ···
-987654321 (BIN)
1234567890 (BIN) -
(s1)
(s1)+1 (s2)+1
b31 b16 b15 b0 b31 b16 b15
··· ··· ···
-1234567890 (BIN) - 987654321 (BIN)
[D-_U instruction]
(s1)+1 (s1) (s2)+1
b31 b16 b15 b31 b16 b15
··· ··· b0 ···
3456789012 (BIN) - 3060399406 (BIN)
Operation error
There is no operation error.
(s2) (d)
(d)+1
b31 b16 b15
··· b0 ··· ··· b0
444434 (BIN)
(s2) (d)
(d)+1
b31 b16 b15
b0 b0
··· ··· ···
-2072745085 (BIN)
(s2) (d)
(d)+1
b0 b31 b16 b15 b0
··· ··· ···
2072745085 (BIN)
(s2) (d)+1 (d)
b31 b16 b15
··· b0 ··· ··· b0
396389606 (BIN)
6 BASIC INSTRUCTIONS
6.1 Arithmetic Operation Instructions
6
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