Mitsubishi Electronics FX3G User Manual
159
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
5 How to Specify Devices and Constants to Instructions
5.4 Specification of Digits for Bit Devices (Kn[ ]***)
1
Introdu
ction
2
Ov
ervi
ew
ew
3
Instruction
Li
st
4
D
evices
in Det
ai
l
5
Specifi
ed the
De
vice
&
C
onst
ant
ant
6
Bef
ore
ore
Pr
og
ra
mmi
ng
ng
7
Bas
ic
ic
Instruction
8
FN
C00-FN
C00-FN
C0
9
Program Fl
ow
9
FNC
10-FN
C19
Mov
e & Com
e & Com
pare
10
FNC
20-FNC
29
Arith. & Lo
gi
c
Operati
on
5.4
Specification of Digits for Bit Devices (Kn[ ]***)
Handling of bit devices
Devices which handle only the ON/OFF information such as X, Y, M and S are called bit devices.
On the other hand, devices handling numeric values such as T, C, D and R are called word devices.
Even bit devices can handle a numeric value when they are combined. In this case, the number of digits Kn and the
head device number are combined.
The number of digits is expressed in 4 bit units (digits); K1 to K4 are used for 16-bit data, and K1 to K8 are used for 32-
bit data.
For example, "K2M0" indicates two-digit data expressed by M0 to M7.
On the other hand, devices handling numeric values such as T, C, D and R are called word devices.
Even bit devices can handle a numeric value when they are combined. In this case, the number of digits Kn and the
head device number are combined.
The number of digits is expressed in 4 bit units (digits); K1 to K4 are used for 16-bit data, and K1 to K8 are used for 32-
bit data.
For example, "K2M0" indicates two-digit data expressed by M0 to M7.
When 16-bit data is transferred to K1M0 to K3M0, the highest-order bits are not transferred due to insufficient data
length.
32-bit data is transferred in the same way.
When the number of digits specified for bit devices is K1 to K3 (or K1 to K7) in a 16-bit (or 32-bit) operation, the
insufficient high-order bits are always regarded as "0". It means that such data is always positive.
length.
32-bit data is transferred in the same way.
When the number of digits specified for bit devices is K1 to K3 (or K1 to K7) in a 16-bit (or 32-bit) operation, the
insufficient high-order bits are always regarded as "0". It means that such data is always positive.
Two-digit BCD data expressed by X004 to X013 is converted into binary
data, and then transferred to D0.
data, and then transferred to D0.
A bit device number can be specified arbitrarily, but it is recommended to set the least significant digit to "0" for X or Y.
(In other words, it is recommended to specify "X000, X010, X020 ... Y000, Y010, Y020 ...")
For M and S, multiples of "8" are ideal, but it is recommended to specify "M0, M10, M20 ..." to prevent confusion.
(In other words, it is recommended to specify "X000, X010, X020 ... Y000, Y010, Y020 ...")
For M and S, multiples of "8" are ideal, but it is recommended to specify "M0, M10, M20 ..." to prevent confusion.
Specification of consecutive words
A series of data registers starting from D1 means "D1, D2, D3, D4 ....."
In the case of word devices with digit specification, when such word devices are handled as a series, they are
specified as shown below:
In the case of word devices with digit specification, when such word devices are handled as a series, they are
specified as shown below:
• K1X000,
K1X004,
K1X010,
K1X014 .....
• K2Y010,
K2Y020,
K2Y030 .....
• K3M0,
K3M12,
M3M24,
K3M36 .....
• K4S16,
K4S32,
K4S48 .....
Use the above devices in digit units so that devices are not skipped.
When "K4Y000" is used in a 32-bit operation, the high-order 16 bits register as "0".
It is necessary to use "K8Y000" when 32-bit data is required.
When "K4Y000" is used in a 32-bit operation, the high-order 16 bits register as "0".
It is necessary to use "K8Y000" when 32-bit data is required.
Sign bit (0 = Positive, 1: Negative)
Transferred
Low order
M15
M8
M7
M0
Do not change
D 0
D 1
K2M0
Transferred
Sign bit (0 = Positive, 1: Negative)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
M6
M5
M12 M11 M10
M9
M4
M3
M2
M1
M14 M13
Low order
M0
FNC 19
BIN
K2X004
D0