Справочник Пользователя для Mitsubishi Electronics 13JW55
App. - 25
Appendix 4.18 Application example of (D) C M L
Complement
(P)
The following explains how to obtain absolute values of negative values -32768 or
smaller (to -2147483648, 32 bit data).
smaller (to -2147483648, 32 bit data).
DCML
D20
D+
D20
D0
K1
1 0 1 1
0 1 0 0 0 1 1
1 0 0 1 0
B
15
B
14
B
1
1
B
0
0
B
15
B
14
B
1
1
B
0
0
D1
D0
0 1 0 0
1 0 1 1 1 0 0
0 1 1 0 1
0 1 0 0
1 0 1 1 1 0 0
0 1 1 1 0
D21
D20
D21
D20
(Negative number)
(Absolute value)
Before DCML
execution
After DCML
execution
After D+ execution
(Example)
Every time X1 is turned on, 999 is subtracted from a set value and the result is
displayed.
When the result value is negative, the output Y70 turns on, and the absolute value of
the result is displayed.
Every time X1 is turned on, 999 is subtracted from a set value and the result is
displayed.
When the result value is negative, the output Y70 turns on, and the absolute value of
the result is displayed.
Reading the set value
Subtraction (-999)
Negative number
obtained?
Y70 setting
DCML execution
+1 execution
Result display
NO
YES
Turn on X0
Turn on X1
X0
X1
M0
Y70
D0
K4X20
DBIN
0
4
18
31
Inputs data
D0
K0
D>
Y70
SET
M0
PLS
D0
K999
D-P
D20
D0
DCML
D30
K1
K8Y40
D30
DBCD
K8Y40
D0
DBCD
D+
D20
Subtracts 999
Turns on Y70 when
negative number is obtained
negative number is obtained
When D0 is negative number,
two's complement is taken to
have positive number (absolute value)
two's complement is taken to
have positive number (absolute value)
Outputs absolute value
Outputs positive number