Indexing In Applied Instructions - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
5.7.2

Indexing in applied instructions

Expression of applied instructions allowing indexing
In the explanation of applied instructions, "
indicate operands allowing indexing as shown in the figure below so that such operands can be discriminated
from operands not allowing indexing.
FNC 12
MOV
In the case of bit devices
The indexing operation is explained in an example in which the
comparison result M0 in CMP (FNC 10) instruction is indexed with
the index register V1 (as shown in the figure on the right).
Transfer K0 or K10 to the index register V1 in advance.
When X001 is set to ON, "M(0+0) = M0" and the comparison result
is output to M0 to M2 if V1 is "0".
On the other hand, "M(0+10) = M10" and the comparison result is
output to M10 to M12 if V1 is "10".
• The index registers Z0 to Z7 and V0 to V7 can be used for
indexing.
In the case of word devices
1. indexing operands in 16-bit instructions
The indexing operation is explained in an example in which the
transfer destination D0 in MOV instruction is indexed with the index
register V3 (as shown in the figure on the right).
Transfer K0 or K10 to the index register V3 in advance.
When X001 is set to ON, "D(0+0) = D0" if V3 is "0", and K500 is
transferred to D0.
When X001 is set to ON, "D(0+10) = D10" if V3 is "10", and K500 is
transferred to D10.
2. indexing operands in 32-bit instructions
In a 32-bit instruction, it is also necessary to specify a 32-bit index
register in the instruction.
When an index register Z (Z0 to Z7) is specified in a 32-bit
instruction, the specified Z and its counterpart V (V0 to V7) work
together as 32-bit registers.
The indexing operation is explained in an example in which the
transfer destinations [D1, D0] in DMOV instruction are indexed with
the index registers [V4, Z4] (as shown in the figure on the right).
Transfer K0 or K10 to the index registers [V4, Z4] in advance.
When X003 is set to ON, "[D(1+0), D(0+0)] = [D1, D0]" is realized if
[V4, Z4] is "0", and K69000 is transferred to [D1, D0].
When X003 is set to ON, "[D(1+10), D(0+10)] = [D11, D10]" is
realized if [V4, Z4] is "10", and K69000 is transferred to [D11, D10].
" is added to the source
Indicates that indexing is allowed.
S D
K100 D 10
5 How to Specify Devices and Constants to Instructions
or destination
S
X000
FNC 12
MOVP
X000
FNC 12
MOVP
X001
FNC 10
CMP
V1=0
D0>D1 → M0=ON M10=ON
D0=D1 → M1=ON M11=ON
D0<D1 → M2=ON M12=ON
X000
FNC 12
MOVP
X000
FNC 12
MOVP
X001
FNC 12
MOV
V3=0 : K500 → D0 (D0+0)
V3=10 : K500 → D10 (D0+10)
X002
FNC 12
DMOVP
X002
FNC 12
DMOVP
X003
FNC 12
DMOVP
V4,Z4=0 : K69000 → D1 ,D0 (D0+0)
V4,Z4=10 : K69000 → D11,D10 (D0+10)
5.7 Indexing
1
symbol to
D
2
3
K0 V1
4
K0 → V1
K10 V1
K10 → V1
D0 D1 M0V1
5
V1=10
6
K0 V3
K0 → V3
K10 V3
7
K10 → V3
K500 D0V3
8
K0 Z4
K0 → V4,Z4
9
K10 Z4
K10 → V4,Z4
K69000 D0Z4
10
167