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3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
6 What to Understand before Programming
6.1 How to Read Explanation of Instructions
1
In
trodu
ct
ion
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O
ver
vi
ew
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In
st
ru
ct
ion 
Li
st
4
D
evices 
in D
etail
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Specifi
ed t
he
D
evice &
 
C
onst
ant
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Bef
ore 
Pr
ogr
am
m
ing
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B
asic 
In
st
ru
ct
ion
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FNC0
0-F
NC0
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Pr
ogr
am
 Flow
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FN
C
10-FN
C
19
Mo
ve
 &
 Co
mp
are
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FNC2
0-F
NC2
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Ar
ith.
 &
 Logic 
O
per
ati
on
6.
What to Understand before Programming
This chapter explains the I/O processing, relationship among instructions and programming method which should be
understood before creating sequence programs.
6.1
How to Read Explanation of Instructions
In this manual, applied instructions are explained in the following form.
For the expression methods and basic rules for applied instructions, read in advance "6.5 General rules for applied
instructions" described later.
The above is different from the actual page, as it is provided for explanation only.
Indicates applicable 
PLC versions.
Applicable series
Expression of applicable versions
x
 
→ Ver.2.20: before Ver.2.20
x
 Ver.2.20 
→: Ver.2.20 or later