Mitsubishi Electronics FX3G User Manual
175
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
6 What to Understand before Programming
6.5 General Rules for Applied Instructions
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
Instruction form and operation type
Applied instructions are classified into "16-bit type" or "32-bit type" by the size of handled numeric values. And by the
operation type, applied instructions are classified into "continuous operation type" or "pulse operation type".
Some applied instructions have every combination of this form and type, and others do not.
operation type, applied instructions are classified into "continuous operation type" or "pulse operation type".
Some applied instructions have every combination of this form and type, and others do not.
1. 16-bit type and 32-bit type
- Applied instructions handling numeric values are classified into the 16-bit type or the 32-bit type by the bit length
of the numeric value data.
This instruction transfers the contents of D10 to D12.
This instruction transfers the contents of D21 and D20 to D23
and D22.
and D22.
- In a 32-bit type instruction, the symbol "D" is added (example: DMOV).
- Either an odd or even device number can be specified, and a specified device is combined with a device having
- Either an odd or even device number can be specified, and a specified device is combined with a device having
the subsequent larger number (in the case of word devices such as T, C and D).
For avoiding confusion, it is recommended to specify an even device number (which will be the low-order side)
for an operand in a 32-bit instruction.
For avoiding confusion, it is recommended to specify an even device number (which will be the low-order side)
for an operand in a 32-bit instruction.
- 32-bit counter (C200 to C255) is regarded as 32 bits, and cannot be used as an operand in a 16-bit instruction.
2. Pulse operation type and continuous operation type
Pulse operation type
In the example shown in the figure on the right, when X000 turns from
OFF to ON , the instruction is executed only once, and is not executed
in any other case.
When it is not necessary to continually execute an instruction, use the
pulse operation type.
The symbol "P" indicates the pulse operation type.
"DMOVP" indicates also the pulse operation type.
OFF to ON , the instruction is executed only once, and is not executed
in any other case.
When it is not necessary to continually execute an instruction, use the
pulse operation type.
The symbol "P" indicates the pulse operation type.
"DMOVP" indicates also the pulse operation type.
Continuous operation type
The figure on the right shows a continuous operation type instruction.
While X001 is ON, the instruction is executed in every operation cycle.
While X001 is ON, the instruction is executed in every operation cycle.
In the continuous operation type of some instructions such as INC (FNC 24) and DEC (FNC 25), the contents of the
destination change in every operation cycle.
destination change in every operation cycle.
For applied instructions requiring attention in using the continuous operation type, the symbol "
" is added to the
title of the explanation of such instructions as shown in the figure below.
In any case, instructions are not executed while the drive input X000 or X001 is OFF. And the destinations do not
change except when instructions specify otherwise.
change except when instructions specify otherwise.
Command 1
FNC 12
MOV
D10
D12
Command 2
FNC 12
DMOV
D20
D22
X000
FNC 12
MOVP
D10
D12
X001
FNC 12
MOV
D10
D12
P
FNC 12
MOV
MOV
No.
Instruction name
D