Mitsubishi Electric MELSEC Q Series User Manual page 166

(3) Precautions
(a) Local device setting
Device ranges set for the use of the auto refresh cannot be set to local devices.
If set, the refresh data will not be updated.
(b) Setting for using the same file name as the program in the file register
Do not set devices for the use of the auto refresh in the file register for each program.
If set, auto refresh will be performed on the file register that corresponds to the last scan execution type
program executed.
(c) Assurance of data sent between CPUs
The old data and the new data may be mixed in each CPU due to the timing of sending data from the host CPU
and auto refresh in the other CPU.
The following shows the method to realize the data consistency of the user data in the communication by the
auto refresh.
1) Data consistency for 32 bit data
Since the data transmission by the auto refresh mode can be set in units of 32 bits only, data separation for
32 bits data will not occur.
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Note4.6 Basic
The Basic model QCPU does not have any local device.
Basic
Note4.7
Since the file register in the Basic model QCPU is fixed, file register cannot be set for each program.
CHAPTER4 COMMUNICATIONS BETWEEN CPU MODULES
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Note4.6
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Note4.7
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