Mitsubishi Electronics Mitsubishi Digital Electronics Video Gaming Accessories FX3G ユーザーズマニュアル
229
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
8 Program Flow – FNC 00 to FNC 09
8.4 FNC 03 – IRET / Interrupt Return
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FNC0
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NC0
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8.4
FNC 03 – IRET / Interrupt Return
Outline
This instruction returns the program execution from an interrupt routine to the main program.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
When an interrupt (input, timer or counter) is generated while the main program is executed, the program execution
jumps to an interrupt (I) routine.
IRET instruction returns the program execution to the main routine.
The table below shows three types of jump to an interrupt routine.
jumps to an interrupt (I) routine.
IRET instruction returns the program execution to the main routine.
The table below shows three types of jump to an interrupt routine.
1. Types of interrupt function
*1.
This function is supported only in FX
3U
/FX
3UC
PLCs.
→ For the interrupt function, refer to Chapter 36.
Operand type
Description
Data type
–
There is no set data.
–
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
–
There are no applicable devices.
Function
Interrupt No.
Description
Reference
Input interrupt
I00* to I50*
Executes the interrupt processing when an input (X) signal turns ON or
OFF.
OFF.
Section 36.3 and
Section 36.4
Timer interrupt
I6** to I8**
Executes the interrupt processing at a specified time interval (constant
cycle).
cycle).
Section 36.5
Counter interrupt
*1
I010 to I060
Executes the interrupt processing when a high speed counter reaches
it’s set value.
it’s set value.
Section 36.6
FNC 03
IRET
IRET
Mnemonic
Operation Condition
Continuous
Operation
Independent Inst.
1 step
This instruction is the independent type, and
does not require drive contact.