Mitsubishi MELSEC-Q Series User Manual page 174

4
COMMUNICATIONS BETWEEN CPU MODULES
(1) Communication using auto refresh
4
- 24 4.1 Communications between CPU modules using CPU shared memory
4.1.3 Communication by auto refresh using multiple CPU high speed transmission area
(a) Overview of auto refresh
The auto refresh is a communication method using the auto refresh area of the
multiple CPU high speed transmission area in the CPU shared memory.
The data written to the auto refresh area of the multiple CPU high speed
transmission area is sent to that of the other CPUs in a certain cycle (multiple
CPU high speed transmission cycle).
Setting the PLC parameter "Multiple CPU settings" allows to automatically read/
write data among all CPUs in the Multiple CPU system.
Since device data of other CPUs can be automatically read by the auto refresh
function, the host CPU can also use them as those of host CPU.