365
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
14 Handy Instruction – FNC 60 to FNC 69
14.1 FNC 60 – IST / Initial State
11
FN
C30-
FN
C39
R
o
ta
tion and
Sh
ift
12
FNC
4
0
-FNC49
D
a
ta
Op
e
ra
tio
n
13
FNC5
0
-FNC5
9
H
igh Speed
Pr
ocessi
ng
14
FM
C6
0
-F
NC6
9
H
and
y
In
st
ru
cti
o
n
15
FNC7
0
-FNC7
9
Ex
te
rn
a
l F
X
I
/O
D
evi
ce
16
FNC8
0
-FNC8
9
Ext
e
rnal
FX
D
evi
ce
17
F
N
C1
00
-F
NC
10
9
Da
ta
Tr
ansf
e
r 2
18
FN
C
110-FN
C
13
9
Fl
oat
ing P
o
in
t
19
FN
C
140-FN
C
149
Da
ta
O
per
at
io
n
2
20
FN
C
15
0-F
N
C
159
P
o
si
tioni
ng
C
ont
ro
l
1. Control of devices by switch operations (occupied devices)
While the command input is ON, the following devices are automatically switched and controlled. While
the command input is OFF, the devices are not switched.
*1.Cleared when the PLC mode is changed from RUN to STOP.
*2.Set to ON when END instruction is executed.
Do not program the following state relays as general state relays;
If the devices are switched among individual operation (X020), zero return (X021) and automatic
operation (X022, X023 and X024) while the zero return complete device (M8043) is OFF, all outputs are
set to OFF.
Automatic operation can be started again after zero return is completed.
→
For introducing IST instruction, refer to "14.1.2 Example of IST instruction introduction
(example of workpiece transfer mechanism)".
Cautions
1. Device specified as
and switches to be used
It is not necessary to use all switches for mode selection.
When some switches are not used, leave the corresponding numbers in the unused status. Such numbers
cannot be used for any other purpose.
2. Programming order of IST instruction and STL instruction
• IST instruction should be programmed earlier than a series of STL circuit such as state relays S0 to S2.
3. State relays used for the zero return operation
Use the state relays S10 to S19 for the zero return operation.
In the final state in the zero return operation, set M8043 to ON, and then let it be reset to OFF by itself.
4. Limitation in the number of IST instruction
IST instruction can be used only once in a program.
Device number
Operation function
Device number
Operation function
M8040
STL transfer disable
S0
Individual operation initial state
M8041
*1
Transfer start
S1
Zero return initial state
M8042
Start pulse
S2
Automatic operation initial state
M8043
*1
Zero return complete
M8045
All output reset disable
M8047
*2
Enable STL monitoring
Device number
Operation function
S0 to S9
Occupied for the initial state
•
S0 to S2 are used for individual operation, zero return and automatic operation as shown above.
•
S3 to S9 can be used arbitrarily.
S10 to S19
Occupied for zero return
D
1
S
