Mitsubishi Electric MELSEC iQ-R Series User Manual page 35

When writing data to the area in the link refresh range, directly access the link device and write the same data
in the device of the CPU module.
• Bad example (Directly accessing the link refresh target only)
Link refresh overwrites the value.
MOV K20 J1\W100
• Good example (Directly accessing the link device as well as writing the same data to the device of the CPU
module)
The value written by the direct access is reflected.
MOV K20 J1\W100
MOV K20 W100
Differences from link refresh
Item
Number of steps
Processing speed
Cyclic data assurance
*1 For the instruction processing time when the link direct device (J\) is used, refer to the following.
 MELSEC iQ-R Programming Manual (CPU Module Instructions, Standard Functions/Function Blocks)
CPU module
W
W100 300
CPU module
W
W100
20
Access method
Link refresh
1 step
High speed
Available
Master/local module
RWw
Link refresh
20 300 RWw100
Master/local module
RWw
Link refresh
20
RWw100
Direct access
2 steps
Low speed
Not available
*1
1 FUNCTIONS
1.1 Cyclic Transmission
1
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