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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
5 How to Specify Devices and Constants to Instructions
5.7 Indexing
5.7.2 Indexing in applied instructions
Expression of applied instructions allowing indexing
In the explanation of applied instructions, " " is added to the source or destination symbol to indicate
operands allowing indexing as shown in the figure below so that such operands can be discriminated from operands
not allowing indexing.
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]" 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]" if [V4, Z4] is
"10", and K69000 is transferred to [D11, D10].
S D
FNC 12
MOV
K100 D 10
S
D
Indicates that indexing is allowed.
X000
K0 V1
K0
→
V1
X000
K10 V1
K10
→
V1
X001
V1=0 V1=10
D0>D1
→
M0=ON M10=ON
D0=D1
→
M1=ON M11=ON
D0<D1
→
M2=ON M12=ON
FNC 12
MOVP
FNC 12
MOVP
D0 D1
FNC 10
CMP
M0V1
X000
K0 V3
K0
→
V3
X000
K10 V3
K10
→
V3
X001
K500 D0V3
V3=0 : K500
→
D0 (D0+0)
V3=10 : K500
→
D10 (D0+10)
FNC 12
MOVP
FNC 12
MOVP
FNC 12
MOV
X002
K0 Z4
K0
→
V4,Z4
X002
K10 Z4
K10
→
V4,Z4
X003
K69000 D0Z4
V4,Z4=0 : K69000
→
D1 ,D0 (D0+0)
V4,Z4=10 : K69000
→
D11,D10 (D0+10)
FNC 12
DMOVP
FNC 12
DMOVP
FNC 12
DMOVP