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CHAPTER 3 FUNCTIONS
3
3.21 High-Speed Interrupt Function
3.21.2 High-speed I/O refresh function and high-speed buffer transfer function
(b) High-speed buffer transfer function
Open the High Speed Buffer Transfer Setting window and set the transfer ranges.
Project window [Parameter] [PLC Parameter] "PLC System" tab "System Interrupt
Settings", "High Speed Interrupt Settings" button "High Speed Buffer Transfer Setting" button
*1 An odd address is allowed when the number of words transferred is set to 1.
Mount the target modules of this function on a main base unit. (Access time to modules mounted on a main base unit is
shorter than that to modules on an extension base unit.)
(2) Precautions
(a) 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)
Item Description Restrictions Number of settings
Assignment Method
Select an assignment method (Points/Start or
Start/End).
--
Buffer Memory Address
Select an buffer memory address input
system (DEC. or HEX.).
Start I/O No. (HEX)
Start I/O number 10
H
(0 to FF
H
)
Intelligent function modules only
Up to six settings for
read and write,
respectively
Points (DEC)
Number of words transferred (1, 2 to FFFE
H
)
• Intelligent function modules only
• Even addresses and even words
only
*1
Buffer Memory Start
Start address (0
H
to FFFF
H
)
Buffer Memory End
End address (0
H
to FFFF
H
)
PLC Side Device Start Start device number
D, W, D (extended data register), W
(extended link register), R, and ZR
PLC Side Device End End device number
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