145
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
6 What to Understand before Programming
6.4 Mutual Relationship Among Program Flow Control Instructions
1
In
troduct
io
n
2
Ov
e
rv
ie
w
3
In
st
ru
ct
ion
Li
st
4
D
evi
ce
s
in
De
ta
il
5
Speci
fied t
h
e
D
evi
ce &
C
onst
a
nt
6
Bef
o
re
Pr
ogr
a
m
m
ing
7
Bas
ic
In
st
ru
cti
o
n
8
FNC0
0
-FNC0
9
P
ro
g
ra
m F
lo
w
9
FNC1
0
-FNC1
9
M
ov
e
&
C
om
par
e
10
FNC
20-
FNC
2
9
Ar
ith.
&
Logi
c
O
per
at
io
n
P-SRET
I-IRET
FEND-END
*1
*3
*3
*3
*3
*3
*3
Remarks
*1
*2
FOR FOR NEXT NEXT
The operation indicated by continuous lines is
realized.
*3
Instructions having containment relationship can
be combined except some combinations as
follows:
1) MC-MCR cannot be used in FOR-NEXT, STL-RET,
P-SRET and I-RET.
2) STL-RET cannot be used in FOR-NEXT, P-SRET
and I-IRET.
3) MC-MCR, FOR-NEXT, P-SRET and I-IRET cannot
be interrupted by I, IRET, SRET, FEND, END, etc.
The first FEND or END is valid, and an intended
program cannot be realized. But this is not an
error.
3
:This combination can be used without any problem.
×
:This combination is disabled; Operation error will be occurs.
U
:This combination is not disabled, but is better not to be used because the operation will be complicated.
The DI skip status occurs, but this is not an
error.
3
3
3
3
3
3
3
3