Mitsubishi Electric MELSEC-Q Series User Manual page 155

(2) 32-bit data integrity assurance
This function prevents read/write data in 32-bit increments from being separated between new and old data.
(a) Data to be assured
The data in the remote register (RWr/RWw) between a CPU module, master station, and local station are
assured.
(b) Method of a data assurance
The following two conditions are required for assurance.
• The first address of the remote register (RWr/RWw) has an even number.
• When accessing the remote register (RWr/RWw) using a program, access them with an even number of
devices.
DMOV
CPU module
instruction
Device
DFRO
W000
instruction
W001
W002
W003
W004
Master station
Remote register
RWr00
RWr01
RWr02
RWr03
RWr04
Master station
CPU module
DMOV
Device Remote register
instruction
W000 RWr00
DFRO
W001
RWr01
instruction
W002 RWr02
W003 RWr03
W004 RWr04
Master station
CPU module
FROM
Device Remote register
instruction
W000 RWr00
W001
RWr01
W002 RWr02
W003 RWr03
CHAPTER 8 FUNCTIONS
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