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CHAPTER 3 FUNCTIONS
3
3.21 High-Speed Interrupt Function
3.21.1 High-speed interrupt program execution function
3.21.1 High-speed interrupt program execution function
This function executes interrupt programs according to the high-speed interrupt pointer (I49).
(1) Setting method
Open the High Speed Interrupt Settings window and set a value to "I49 Fixed Scan Interval" within the range of
0.1 to 1.0ms.
Project window [Parameter] [PLC Parameter] "PLC System" tab "System Interrupt
Settings", "High Speed Interrupt Settings" button
(2) Precautions
(a) High-speed interrupts while interrupts are disabled
High-speed interrupt programs are not executed while interrupts are disabled. To execute the programs, the
interrupt enable condition needs to be established.
For the functions that disable interrupts and delay the startup of a high-speed interrupt, refer to Page 230,
Section 3.21.3 (3).
(b) High-speed interrupts that are ignored
If interrupts are disabled for the period longer than the set interrupt interval, there is a case that high-speed
interrupts are ignored. If a high-speed interrupt occurs twice during an interrupt disabled period, the second
interrupt is ignored.
(c) Executability of this function
This function is executed when all of the following conditions are met.
• The EI instruction is being executed.
• The CPU module is running.
• The high-speed interrupt pointer (I49) is not masked by the IMASK instruction. (Default: Not masked)
For the IMASK and EI instructions, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
Set a value within
the range of 0.1 to
1.0ms.
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