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4
FUNCTIONS
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(2) How to prevent data inconsistency
The I/O data separation prevention function is executed by either of the following
methods.
This function is not available when the MOV or FROM/TO instruction is used for
buffer memory reading/writing.
(a) Using automatic refresh
Automatic refresh can be set in GX Configurator–DP.
To use the data separation prevention function at the time of automatic
refresh, check the "Enable Autorefresh" and "Consistency" boxes in the
"Buffer Devices" area on the parameter setting window.
REMARKS
For the automatic refresh setting method, refer to Section 5.3.1.
(b) Using dedicated instruction
Using the BBLKRD or BBLKWR instruction to read or write data prevents I/O
data separation. (Refer to Chapter 8)
REMARKS
Refer to Section 7.3.1 and 7.3.2 for program examples of the I/O data
communication using dedicated instructions.
MELSEC-Q
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