Mitsubishi MELSEC-Q Series User Manual page 159

4
COMMUNICATIONS BETWEEN CPU MODULES
(1) Communication using auto refresh
(a) Operation of auto refresh
POINT
Auto refresh allows communications using the auto refresh area of the CPU
shared memory.
By making multiple CPU settings in "PLC parameter", data are automatically
written/read between all CPU modules of the multiple CPU system.
As device memory data of other CPUs are automatically read by the auto refresh
function, the host CPU can use those device data.
The following CPU modules in a multiple CPU system can perform auto refresh
using auto refresh area in CPU shared memory.
Auto refresh is a factor for increasing the scan time in the multiple CPU system.
For calculation formulas for the auto refresh time, refer to Section 5.2.
4.1 Communications between CPU modules using CPU shared memory
4.1.2 Communication by auto refresh using CPU shared memory
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