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MELSEC-Q
8 COMMUNICATION WITH INTELLIGENT FUNCTION MODULE/SPECIAL
FUNCTION MODULE
8.2 Request from Intelligent Function Module to High Performance model QCPU
8.2.1 Interrupt from the intelligent function module
(1) Interrupt from the intelligent function module
High Performance model QCPU executes an interrupt program (I50 to I255) by
the interrupt request from the intelligent function module.
For example, the serial communication module processes the data reception by
an interrupt program when the following data communication functions are
executed.
• Data reception during the communication with no handshaking protocol
• Data reception during the communication with bi-directional protocol
Processing data reception with an interrupt program improves the data reception
speed of High Performance model QCPU.
Main program
The objective serial
communication module
reception
Occurrence of
interrupt
Serial communication
module
data transmission
Interrupt program
execution
Main program
FEND
BUFRCVS
SM400
PLC CPU
I
(2) Setting an interrupt from the intelligent function module
To execute an interrupt program by the interrupt of the intelligent function
module, it is necessary to designate the "Intelligent function module setting
(Interrupt pointer setting)" at the "PLC system" tab screen in the “(PLC)
Parameter" dialog box.
You should also designate "System setting" at the intelligent function module.
To execute an interrupt program by the interrupt from the intelligent function
module, refer to the manual of the intelligent function module being used.
Содержание QCPU (Q Mode)
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