Hitachi HIDIC MICRO-EH Applications Manual page 99

Item number Arithmetic instructions-4
Ladder format
d = s1 – s2
Instruction format
d = s1 – s2
Usable I/O
d Substitution destination
s1 Minuend
s2 Subtrahend
Function
•
Subtracts s2 from s1 as the binary data, and substitutes the result into d as the binary data.
•
The C flag is set to "1" if there is a digit decrease, and "0" if not.
C = s1m s2m + s1m dm + s2m dm
•
The V flag is set to "1" if the operation result is a meaningless signed-binary data, and "0" if it has meaning.
s1 s2
Positive Positive
Negative Negative
Positive Negative
Positive Negative
Negative Positive
Negative Positive
Notes
•
The combinations of d, s1 and s2 are as follows:
d
Word
Double word Double word
Program example
X00000
Program description
•
When input X00000 is on, the difference between WR0000 value and WR0001 value is substituted into WR0002.
Name
Condition code
R7F4 R7F3 R7F2
DER ERR SD
Number of steps
Condition
Word
Double word
Bit
R, TD, SS,
X Y M CU, CT WX WY
d V
Positive/Negative 0
Positive/Negative 0
Positive 0
Negative 1
Positive 1
Negative 0
s1 s2
Word Word
Double word
WR0002 = WR0000 - WR0001
5-49
Chapter 5 Instruction Specifications
Binary subtraction (BINARY SUBTRACTION)
Processing time (µs)
R7F1 R7F0
Average Maximum
V C
41
↕ ↕
Steps
4 58
6
Word Double word
WR, DR,
WM TC DX DY DM
Most significant bit
s1m
s2m
−
dm
C
V = s1m s2m dm + s1m s2m dm
LD X00000
[
WR0002 = WR0000 - WR0001
]
Remark
Upper case: W

Lower case: DW

Other
0
s1
0 s2
0 d