Mitsubishi Electric MELSEC iQ-R-R6SFM - Multiple CPU Synchronous Interrupt

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16 MULTIPLE CPU SYSTEM FUNCTION
16.5 Multiple CPU Synchronous Interrupt
16.5 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.)
The operation methods required when an interrupt factor occurs and the program creating methods are the
same as those for normal interrupt program. ( Page 67 Interrupt Program)
 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.)
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CPU module
(CPU No.1)
Multiple CPU synchronous
interrupt program
Refresh
Operation
processing
Refresh
PauseNormal program
Multiple CPU
synchronous
interrupt program
Send data of CPU No.2
Send data
of CPU No.1
Receive area
of CPU No.1
Read Write
Send area
of CPU No.1
CPU module
(CPU No.2)
Multiple CPU synchronous
interrupt program
Refresh
Operation
processing
Refresh
Execution time of the
multiple CPU synchronous
interrupt program
PauseNormal program
Multiple CPU
synchronous
interrupt program
Pause
Multiple CPU synchronous
interrupt program
Refresh
Operation
processing
Refresh
Receive area
of CPU No.2
Send area
of CPU No.2
Read Write
Send data
of CPU No.2
Multiple CPU synchronous
interrupt program
Refresh
Operation
processing
Refresh
Pause
Fixed scan
communication area
Fixed scan
communication area
Execution time of the
multiple CPU synchronous
interrupt program
Fixed scan communication cycle Fixed scan communication cycle