Input Interrupt (Interrupt By External Signal) [With Delay Function]; Timer Interrupt (Interrupt In Constant Cycle) - Mitsubishi Electric FX3G SERIES Programming Manual
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FX
/FX
/FX
Series Programmable Controllers
3G
3U
3UC
Programming Manual - Basic & Applied Instruction Edition
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
Contact for setting delay time
I
M8393
Program to be executed as input interrupt
3. Timing chart
Interrupt input
(X000 to X005)
Interrupt program is
executed
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.
812
FNC 12
K
*
D8393
MOV
[1] Delay time (unit: ms)
FNC 03
IRET
Delay time
(msec)
36 Interrupt Function and Pulse Catch Function
36.4 Input interrupt (Interrupt by External Signal) [With Delay Function]
•
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. Do not add, change, or delete this
routine program when writing during RUN.
Interrupt programs may not operate normally.
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*. If any other device or
constant is used, the delay time setting becomes
invalid and the interrupt functions as a normal input
interrupt. If the contents of the set data register (D) are
"0", the delay time is regarded as "0".
•
End of interrupt program.
Because the previous interrupt processing
is not completed, the interrupt processing
is not executed here.
Valid
IRET
instruction
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