Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 65

Processing details
• These instructions subtract the 16-bit binary data in the device specified by (s2) from the 16-bit binary data in the device
specified by (s1), and store the operation result in the device specified by (d).
(s1)
b15 b0 b15
···
1234 (BIN)
5678 (BIN) -
• If an underflow occurs in the result, the borrow bit is ignored. In this case, SM700 does not turn on.
[- instruction]
(s1)
b15 b0 b15
···
-12345 (BIN) 23456 (BIN)
-
(s1)
b15 b0 b15
···
12345 (BIN) -23456 (BIN)
-
[-_U instruction]
(s1)
b15 b0 b15
···
56790 (BIN)
56789 (BIN) -
Operation error
There is no operation error.
(s2) (d)
b0 b15
··· ···
4444 (BIN)
(s2) (d)
b0 b15
··· ···
29735 (BIN)
(s2) (d)
b0 b15
··· ···
-29735 (BIN)
(s2) (d)
b0 b15
··· ···
65535 (BIN)
b0
b0
b0
b0
6.1 Arithmetic Operation Instructions
6 BASIC INSTRUCTIONS
6
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