Fnc 60 - Ist / Initial State - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
14.1 FNC 60 – IST / Initial State
Outline
This instruction automatically controls the initial state and special auxiliary relays in a step ladder program.
1. Instruction format
FNC 60
IST
2. Set data
Operand type
S S
1
D
1
D
2
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
S S
1
S D
2
1
D
2
1: "D .b" is available only in FX
2: S20 to S899 and S1000 to S4095
Explanation of function and operation
Command
input
FNC 60
IST
• Specify the head input in the operation mode in
Selector switches in the operation mode occupy eight devices from the head device
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.
Source
S
S + 1
S + 2
+ 3
S
S + 4
+ 5
S
+ 6
S
S + 7
• Specify the smallest device number of practical state relays in
• Specify the largest device number of practical state relays in
Mnemonic
16-bit Instruction
7 steps IST
Head bit device number of the selector switch in the operation mode
Smallest state relay number of practical state relays in the automatic mode
( < )
D D
1 2
Largest state relay number of practical state relays in the automatic mode
( < )
D D
1 2
Digit Specification
1
2
2
and FX
3U
S D D
1
Device number (example)
X020
X021
X022
X023
X024
X025
X026
X027
14 Handy Instruction – FNC 60 to FNC 69
→ For SFC programs and step ladder, refer to Chapter 35.
Operation Condition
32-bit Instruction
Continuous
Operation
Description
Word Devices
Special
System User
Unit
V Z Modify K H
PLC. However, index modifiers (V and Z) are not available.
3UC
2
.
S
Individual operation
Return to zero point
Stepping
Cycle operation
Continuous operation
Zero return start
Automatic start
Stop
D
1
(for the automatic mode).
D
2
14.1 FNC 60 – IST / Initial State
Mnemonic Operation Condition
−
Data type
Bit
Bit
Bit
Others
Con- Real Charac-
Index
stant Number ter String
E " "
, and the switch
S
Switch function
(for the automatic mode).
11
12
13
14
15
Pointer
P
16
17
18
19
20
405