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(6) Parameter settings
To use the user setting area in the multiple CPU high speed transmission area, set the ranges (number of points)
to be sent by each CPU module ("CPU Specific Send Range") in PLC parameter ("Multiple CPU Setting").
For setting details, refer to Page 135, Section 6.1.2.
(7) Assurance of send data
Old data and new data may coexist (data inconsistency) in each CPU module due to the timing of reading data in
the host CPU module and writing/sending data in other CPU modules. The following are the methods to prevent
data inconsistency in data communications by programs using the CPU shared memory.
(a) Preventing inconsistency of 32-bit data
To prevent data inconsistency, access the user setting area in the CPU shared memory by specifying an even
number as the start address.
Ex.
Specifying "10002" as the start address
D0
Device memory CPU shared memory
Even number
address
G10000
G10001
G10002
G10003
G10004
[ DMOV D0 U3E0\G10002 ]