Mitsubishi Electric MELSEC Q Series User Manual page 157

(2) Refresh settings
To perform auto refresh in CPU shared memory, set the number of points to be sent from each CPU module
(Send range for each PLC) and a device for storing data (PLC side device) on Multiple CPU settings in PLC
parameter.
Setting No. switch
Set the send range for
each CPU module
(a) Setting switching and send range for each CPU (Refresh range)
1) It is possible to set 4 ranges from Setting 1 to 4 for the refresh setting with the setting switching.
For example, ON/OFF data can be set to bit devices and other data can be set to word devices separately.
2) In the send range for each CPU, the points of the CPU shared memory are set in 2-point units (2 words.) (2
points in the word device specification and 32 points in the bit device specification)
Data for which the point is set to "0" in the send range for each CPU will not be refreshed.
When refresh is performed for 32 points (B0 to B1F) on CPU No.1 and 32 points (B20 to B3F) on CPU No.2,
the number of send points is 2 for CPU No.1 and 2 for CPU No.2 since 1 point of the CPU shared memory
is equal to 16 points of bit devices.
4 - 11
Figure 4.6 Auto refresh setting screen
Select either setting the device of
each CPU module from CPU No.1
consecutively or setting them with
each CPU.
Set the device range of each CPU
module
(Use the specified points
continuously from the set device
number.)