Multiple Cpu Synchronous Interrupt - Mitsubishi Electric MELSEC iQ-R Series User Manual

23.5

Multiple CPU Synchronous Interrupt

This function triggers an interrupt program at the fixed scan communication cycle set in a parameter. An interrupt program
executed at the fixed scan communication cycle is called a multiple CPU synchronous interrupt program. Using the multiple
CPU synchronous interrupt enables synchronizing with the fixed scan communication cycle so that data communication
between CPU modules can be made. (It allows synchronizing the data communication timing between CPU modules.)
CPU module
(CPU No.1)
Normal program
Multiple CPU
synchronous
Refresh
interrupt program
Ò
Fixed scan
communication area
Send data of CPU No.2
Fixed scan
communication area
Refresh
Multiple CPU
Ò
synchronous
interrupt program
Normal program
CPU module
(CPU No.2)
 Data reading of other CPU modules (refresh): Data sent from other CPU modules is read to a device or a label. (Data is read from the receive area of the
host CPU module.)
 Operation processing: The multiple CPU synchronous interrupt program is executed.
 Data sending of other CPU modules (refresh): Data to be sent to other CPU modules is written from a device or a label. (Data is written to the send area of
the host CPU module.)
The operation methods required when an interrupt factor occurs and the program creating methods are the
same as those for normal interrupt program. ( Page 115 Interrupt Program)
Fixed scan communication cycle
Execution time of the
multiple CPU synchronous
interrupt program
Pause
Multiple CPU synchronous
interrupt program
Operation
Refresh
processing
Ó Ô
Send area
of CPU No.1
Read Write
Receive area
of CPU No.1
Send data
of CPU No.1
Operation
Refresh
processing
Ó Ô
Multiple CPU synchronous
interrupt program
Pause
Execution time of the
multiple CPU synchronous
interrupt program
Fixed scan communication cycle
Pause
Multiple CPU synchronous
interrupt program
Operation
Refresh Refresh
processing
Ò Ó Ô
Send data
Receive area
of CPU No.2
Read Write
Send area
of CPU No.2
Operation
Refresh Refresh
processing
Ò Ó Ô
Multiple CPU synchronous
interrupt program
Pause
23 MULTIPLE CPU SYSTEM FUNCTION
23.5 Multiple CPU Synchronous Interrupt
of CPU No.2
363
23