Mitsubishi Electronics FX3UC ユーザーズマニュアル
389
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
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
C3
C30
-FN
C3
9
R
ota
tion and
Shi
ft
ft
12
FN
C40-FN
C40-FN
C49
D
ata O
perati
perati
on
13
FNC
50-FNC
59
High-Speed
Proc
essing
14
FM
C60-FN
C60-FN
C69
H
andy
In
struction
15
FN
C70-FN
C70-FN
C79
E
xternal
F
X
I/O
De
vice
16
FNC
80-FNC
89
External
FX
Dev
ice
ice
17
FNC1
00-
FNC10
00-
FNC10
9
Dat
a
a
Transfer 2
18
FNC1
10-
FNC139
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
Operation 2
20
FNC1
50-
FNC159
FNC159
Pos
itioning
itioning
Control
14.1
FNC 60 – IST / Initial State
Outline
This instruction automatically controls the initial state and special auxiliary relays in a step ladder program.
→ For SFC programs and step ladder, refer to Chapter 35.
1. Instruction format
2. Set data
3. Applicable devices
S1: "D .b" is available only in FX
3U
and FX
3UC
PLCs. However, index modifiers (V and Z) are not available.
S2: S20 to S899 and S1000 to S4095 in the FX
3G
, FX
3GC
, FX
3U
and FX
3UC
PLCs.
S20 to S255 in the FX
3S
PLC.
Explanation of function and operation
• Specify the head input in the operation mode in
.
Selector switches in the operation mode occupy eight devices from the head device
, and the switch
functions shown in the table below are assigned to each of them.
When X020 is assigned as shown below, it is necessary to set X020 to X024 as rotary switches so that they do not
turn ON at the same time.
It is not necessary to wire unused switches, but they cannot be used for any other purpose because they are
occupied by IST instruction.
When X020 is assigned as shown below, it is necessary to set X020 to X024 as rotary switches so that they do not
turn ON at the same time.
It is not necessary to wire unused switches, but they cannot be used for any other purpose because they are
occupied by IST instruction.
• Specify the smallest device number of practical state relays in
(for the automatic mode).
• Specify the largest device number of practical state relays in
(for the automatic mode).
Operand type
Description
Data type
Head bit device number of the selector switch in the operation mode
Bit
Smallest state relay number of practical state relays in the automatic mode
(
(
<
)
Bit
Largest state relay number of practical state relays in the automatic mode
(
(
<
)
Bit
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
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
S1
S2
S2
Source
Device number (example)
Switch function
X020
Individual operation
+ 1
X021
Return to zero point
+ 2
X022
Stepping
+ 3
X023
Cycle operation
+ 4
X024
Continuous operation
+ 5
X025
Zero return start
+ 6
X026
Automatic start
+ 7
X027
Stop
FNC 60
IST
−
Mnemonic
Operation Condition
16-bit Instruction
7 steps IST
Mnemonic
Operation Condition
Continuous
Operation
32-bit Instruction
S
1
S
D
1
D
1
D
2
D
2
D
1
D
2
S
1
S
S
2
D
1
D
2
Command
input
FNC 60
IST
S
D
1
D
2
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
D
1
D
2