Mitsubishi FX2N-10GM - 19 FNC29 (NEG): Complement

FX Series Positioning Controllers Program format 5
5-59
5.10.19 FNC29 (NEG): Complement
Obtaining the absolute value of a negative value
FNC 29
NEG
Applicable models
Series name
Remarks
K,H KnX KnY KnM D V,Z
Applicable
devices
and basic
format
Word
devices
FNC 29
NEG
FX
2N
-10GM
FX
2N
-20GM
BINARY
NEG
[D]NEG
Complement
Each bit of data in the device specified by
is inverted (0
→
1,1
→
0), "1" is added to the
inverted bits, then the result is saved in the
same device.
Drive
input
D·
D·
D·
16-bit operation
3 steps
32-bit operation
5 steps
FNC 29
NEG
D 10
X00
This instruction yields the absolute value of a
negative binary value.
(D10)+1
→
(D10)
·
1000000000000000
0010000000000000
0100000000000000
0000000000000000
1111111111111111
1010000000000000
1100000000000000
(D 10) + 1 = -32,768
(D 10) = 2
(D 10) = 1
(D 10) = 0
(D 10) + 1 = 1
(D 10) + 1 = 2
(D 10) + 1 = 3
(D 10) + 1 = 32,766
(D 10) + 1 = 32,767
(D 10) = -32,768
(D 10) = -32,767
(D 10) = -32,766
(D 10) = -3
(D 10) = -2
(D 10) = -1
The miximum absolte value is 32,767 for 16-bit operation.
1011111111111111
1001111111111111
0100000000000000
0010000000000000
0110000000000000
0011111111111111
0111111111111111
1000000000000000
The positioning unit expresses negative values in the
form of twos complement as shown on the left.
If the most significant bit is 1, the number is negative
and its absolute value can be obtained using the NEG
instruction.