Fnc 04 - Ei / Enable Interrupt - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
8.5 FNC 04 – EI / Enable Interrupt
Outline
Interrupts are usually disabled in PLCs.
This instruction enables interrupts in PLCs.
Use this instruction for using the input interrupt, timer interrupt and counter interrupt functions.
1. Instruction format
FNC 04
EI
2. Set data
Operand type
–
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
–
Explanation of function and operation
EI instruction is the independent type, and does not require command (drive) contact.
242
Mnemonic
Independent Inst.
1 step EI
There is no set data.
Digit Specification
Operation Condition
This instruction is the independent type, and
Continuous
does not require drive contact.
Operation
Description
Word Devices
Special
System User
Unit
V Z Modify K H
There are no applicable devices.
→ For the interrupt function, refer to Chapter 36.
8 Program Flow – FNC 00 to FNC 09
8.5 FNC 04 – EI / Enable Interrupt
Data type
Others
Con- Real Charac-
Index
stant Number ter String
E " "
–
Pointer
P