X8 Instruction Set Reference Manual
19-2
Using Interrupts
The following table shows usage of the interrupt of the X8 Series PLC.
What is an Interrupt?
The following figure shows how an interrupt works.
Not only PLC, most control devices like PC support interrupt function.
An interrupt is an event that causes the controller to suspend the task it is
currently performing, perform a different task, and then return to the next task
at the point where it suspended.
As you can see the above figure, if an interrupt occurs at one point during the
ladder program execution, it suspends task it is currently performin
g
, then
performs subroutines specified by SFR or ladder program according to the
occurred interrupt type.
For example, in the following figures, when an interrupt occurs in the
LadderProgramNumber, if you input the subroutine number to perform, it
perfo
r
ms follo
w
ing defied subroutines.
Instruction
Description
INT
Interrupt Subroutine
Label to indicate the start of the interrupt.
PITS
PIT(Programmable Interrupt Timer) Start
Execute interrupt timer.
INTD
Interrupt Disable
Disable the user interrupt.
INTE
Interrupt Enable
Enable the user interrupt.
INTF
Interrupt Flush
Remove the various wa
I
ting user interrupt from the system.
Summary of Contents for X8 Series
Page 1: ...Catalog Number s X8 M14DDT X8 M16DDR X8 M32DDT X8 Instruction Manual Reference Manual ...
Page 16: ......
Page 64: ...X8 Instruction Set Reference Manual 2 12 X8 Series PLC Memory and Data Table ...
Page 166: ...X8 Instruction Set Reference Manual 7 8 Relay Type Bit Instructions ...
Page 180: ...X8 Instruction Set Reference Manual 8 14 Timer and Counter Instructions ...
Page 205: ...X8 Instruction Set Reference Manual Math Instructions 10 17 ...
Page 206: ...X8 Instruction Set Reference Manual 10 18 Math Instructions ...
Page 212: ...X8 Instruction Set Reference Manual 11 6 Converion Instructions ...
Page 218: ...X8 Instruction Set Reference Manual 12 6 Logical Instructions ...
Page 236: ...X8 Instruction Set Reference Manual 15 8 Shift and FIFO LIFO Instructions ...
Page 242: ...X8 Instruction Set Reference Manual 16 6 Sequencing Instructions ...
Page 252: ...X8 Instruction Set Reference Manual 18 4 Input and Output Instructions ...
Page 280: ...X8 Instruction Set Reference Manual 20 12 PID Control ...
Page 296: ...X8 Instruction Set Reference Manual 21 16 ASCII Instructions ...
Page 308: ...X8 Instruction Set Reference Manual 22 12 Communications Instructions ...
Page 312: ...Appendix A 4 System Error Code ...
Page 313: ...Appendix B MSG Instruction Error Code MSG Instruction Error Code ...
Page 322: ...Appendix B 10 MSG Instruction Error Code ...
Page 325: ...ASCII Character Set Appendix C 3 ...
Page 326: ...Publication number X8 RM001A EN September 2012 ...
Page 327: ...Copyright 2012 RS Automation Co Ltd All rights reserved ...