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FX
3G
/FX
3U
/FX
3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
8 Program Flow – FNC 00 to FNC 09
8.9 FNC 08 – FOR / Start a FOR/NEXT Loop
1
In
trodu
ct
ion
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O
ver
vi
ew
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In
st
ru
ct
ion 
Li
st
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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
8
FNC0
0-F
NC0
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Pr
ogr
am
 Flow
9
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
8.9
FNC 08 – FOR / Start a FOR/NEXT Loop
Outline
FOR instruction specifies the number of repetition of the loop between FOR and NEXT (FNC 09) instructions.
1. Instruction format
2. Set data
3. Applicable devices
S
: This function is supported only in FX
3U
/FX
3UC
 PLCs.
Explanation of function and operation
→ For details, refer to NEXT (FNC 09) instruction.
Related instruction
FOR instruction and NEXT (FNC 09) instruction are set as a pair in programming.
Operand type
Description
Data type
Number of repetition of the loop between FOR and NEXT instructions 
[
 = K1 to K32767]
(A value from 
−32768 to 0 is handled as "1".)
16-bit binary
Oper-
and 
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special 
Unit
Index
Con-
stant
Real 
Number
Charac-
ter String
Pointer
X Y M T C S D….b KnX KnY KnM KnS T C D R U…\G… V Z Modify K H
E
"…"
P
3
3
3
3
3 3 3 3
S
3 3
3
3 3
FNC 08
FOR
FOR
Mnemonic
Operation Condition
Mnemonic
Operation Condition
Continuous
Operation
16-bit Instruction
3 steps
32-bit Instruction
  S
  S
  S