Mitsubishi Electric MELSEC-Q Series - Page 79

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CHAPTER 4 FUNCTIONS
4
4.1 Cyclic Transmission Function 4.1.5 Assurance of cyclic data integrity
(1) 32-bit data assurance
When "Network Range Assignment" of the control station is set with the following four conditions met, 32-bit data
integrity is automatically assured.
• The start device No. of LB is a multiple of 20
H
.
• The points assigned per station in LB is a multiple of 20
H
.
• The start device No. of LW is a multiple of 2.
• The points assigned per station in LW is a multiple of 2.
(a) Link refresh
Link-refreshing the link devices that satisfy the conditions for 32-bit data assurance will ensure the integrity of
32-bit data.
For assuring data of more than 32 bits, use the station-based block data assurance or interlock programs.
Station
No.1
32-bit
data 1
32-bit
data 2
32-bit
data 3
Station
No.2
Station
No.3
LW0
Link refresh in 32-bit units
Link refresh
LW1
LW2
LW3
LW6
LW7
Link register (LW)
CC-Link IE Controller
Network module
Link register (W)
CPU module
Link refreshLink refresh