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1 RUNNING A PROGRAM
1.7 Interrupt Program
• For I44
If interrupt is enabled before the next cycle, the I44 interrupt program will be executed when the interrupt is enabled. If
interrupt continues to be disabled beyond the start of the next cycle (the second cycle), the memorized information will be
discarded (even when the interrupt is enabled, the I44 interrupt program will not be executed). Also, if the I44 interrupt
program for this cause cannot be executed, SM480 (Cycle overrun flag for inter-module synchronization program (I44)) is
turned on, and SD480 (Number of cycle overrun events for inter-module synchronization cycle program (I44)) reaches its
upper limit. If the IMASK instruction and SIMASK instruction are used to disable the interrupt, all the memorized factors will be
discarded.
Sc: Inter-module synchronization cycle
(1) The interrupt factor is memorized.
(2) Because an interrupt does not occur, the memorized information is discarded in the second cycle.
(3) The interrupt is executed when interrupts are enabled.
(4) I44 is not executed because interrupts continue to be disabled beyond the second cycle of I44.
(5) The interrupt is executed because interrupts are enabled.
I44
I44
I44
I44
t
(1)
(1)
(2)
(5)
(3)
(4)
Sc
Sc
Sc
Sc
Interrupts are
disabled (DI).
Interrupts are
disabled (DI).
Main routine program
I44 interrupt program
Содержание MELSEC iQ-R-R00CPU
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Страница 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Страница 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Страница 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Страница 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Страница 524: ...522 30 MAINTENANCE AND INSPECTION FOR A REDUNDANT SYSTEM 30 1 Module Replacement in the Redundant System MEMO ...
Страница 1009: ...APPX Appendix 14 List of Available SQL Commands for CPU Module Database Access Function 1007 A MEMO ...
Страница 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
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