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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
36 Interrupt Function and Pulse Catch Function
36.4 Input interrupt (Interrupt by External Signal) [With Delay Function]
36.4 Input interrupt (Interrupt by External Signal) [With Delay Function]
1. Outline
An input interrupt has the function to delay execution of an interrupt routine in units of 1 ms.
The delay time can be specified using the pattern program shown below.
By using the delay function, the mounting position of a sensor used for input interrupts can be adjusted electrically
without changing the actual position.
2. Programming procedure
3. Timing chart
36.5 Timer Interrupt (Interrupt in Constant Cycle)
36.5.1 Timer interrupt (interrupt in constant cycle)
1. Outline
An interrupt routine is executed at every 10 to 99 ms without being affected by the operation cycle of a PLC.
2. Application
This type of interrupt is suitable when a certain program should be executed at high speed while the main program
operation time is long or when a program should be executed at a constant time interval in sequence operations.
M8393
FNC 12
MOV
K
{{{
*
Delay time specification program
Make sure to describe the delay time
specification program shown on the left at the
head of an interrupt routine program.
Because this program is a pattern program,
change only the delay time ([1]).
Only a constant (K) or data register (D) is
available for specifying the time here*.
D8393
[1] Delay time (unit: ms)
FNC 03
IRET
Program to be executed as input interrupt
Contact for setting delay time
•
End of interrupt program.
•
I
Interrupt input
(X000 to X005)
Interrupt program is
executed
Because the previous interrupt processing
is not completed, the interrupt processing
is not executed here.
Valid
Delay time
(msec)
IRET
instruction