Mitsubishi Electric MELSEC iQ-R04ENCPU, User Manual

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24
1 FUNCTIONS
1.1 Cyclic Transmission
When there is a remote device station in the network, use station-based block data assurance. If it is disabled,
the functions of the remote device station cannot be assured.
32-bit data assurance
The RWr and RWw data can be assured in 32-bit units.
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Data assurance at the time of direct access to link devices
When link refresh target devices are accessed, the integrity of 32-bit data can be assured by satisfying the following
conditions.
• The start device number of RWr, RWw is multiples of 2.
• The number of points assigned to RWr, RWw is multiples of 2.
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Data integrity assurance at the time of access to buffer memory
The integrity of 32-bit data can be assured by satisfying the following conditions.
• Access using the DMOV instruction
• The start address of the buffer memory is multiples of 2.
For data assurance of more than 32 bits, use station-based block data assurance or interlock programs.
0H
1H
2H
3H
4H
5H
6H
7H
RWr, RWw
2 words
(32 bits)
Master/local module
Device
CPU module
Link refresh
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
0H
1H
2H
3H
4H
5H
6H
7H
2 words
(32 bits)
Buffer memory
Master/local module
2 words
(32 bits)
2 words
(32 bits)
2 words
(32 bits)
DMOV instruction
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