Mitsubishi Electric MELSEC FX3U Programming Manual page 338

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Program example
1. When setting bit devices to ON according to the value of a data register
The value of D0 (whose current value is "14" in this example) is decoded to M0 to M15.
M8000
FNC 41
DECO
Up to Up to
...
M255 M127
M255
Up to 256 bits (The number of occupied bits varies depending on the specified "n" value.)
• When the value of b0 to b3 of D0 is "14 (= 0 + 2 + 4 + 8)", M14 (which is the 15th from M0) becomes "1"
(turn ON).
• When the value of D0 is "0", M0 becomes "1" (turns ON).
• When "n" is set to "K4", either one point among M0 to M15 turns ON according to the value of D0 (0 to 15).
• By changing "n" from K1 to K8, D0 can correspond to numeric values from 0 to 255.
However, because the device range of
should not be used for another control.
2. Turning ON the bit out of word devices according to the contents of bit devices
The value expressed by X000 to X002 is decoded to D0 (X000 and X001 are ON, and X002 is OFF in this
example.).
M8000
FNC 41
DECO
• When the values expressed by X000 to X002 are "3 (= 1 + 2 + 0)", b3 (which is the 4th from b0) becomes
1 (turns ON).
• When all of X000 to X002 are "0" (OFF), b0 becomes "1" (turns ON).
336
S D
n
D 0 M 0 K 4
b15
Up to Up to
... ...
M63 M31
0 1 0
M M M
15 14 13
S D
n
X000 D0 K3
Ignored
(D0 b4 to b15)
...
7 6 5 4
0 0 0 0 1 1 1 0
K8 K7 K6 K5
0 0 0 0 0 0 0 0
M M M
M9 M8 M7 M6 M5
12 11 10
is occupied for decoding accordingly, such device range
D D
1
0 0 0 0 0 0 0 0
b15 b14 b13 b12 b11 b10 b9 b8
All of these bits are
"0" (OFF).
12 Data Operation – FNC 40 to FNC 49
12.2 FNC 41 – DECO / Decode
4 bits
(D0 b0 to b3)
3 2 1 b0
S
When the value of b0 to
b3 of D0 is "14"
← 2
n
← n = K4
K4 K3 K2 K1
Turns ON when D0 is K0.
0 0 0 0 0 D
When
M4 M3 M2 M1 M0
X2 X1 X0
0 1 1 S
← 2
K3 K2 K1
Turns ON when all
bits of
0 0 0 0 1 0 0 0
b7 b6 b5 b4 b3 b2 b1 b0
is M0
n
← n
S are OFF.
D
=D0