Mitsubishi Electric MELSEC iQ-R Series User Manual page 36

Shortening the transmission delay time
The transmission delay time can be shortened by reducing the number of link refresh points and shortening a communication
cycle interval. ( Page 293 Communication cycle intervals)
The following methods can be used to reduce the number of the link refresh points.
• In "Refresh Settings" under "Basic Settings", set only the link devices frequently used in the CPU module as the link refresh
range. ( Page 99 Refresh Settings)
• Remove infrequently used link devices in the CPU module from the link refresh range, and directly read or write the
corresponding data from the program by direct access.
Link refresh is performed in END processing of the sequence scan of the CPU module.
Precautions
■Cyclic data assurance
The direct access to link devices does not provide station-based block data assurance. Use 32-bit data assurance, or if cyclic
data of more than 32 bits needs to be assured, use interlock programs. ( Page 35 Cyclic data assurance)
■Mounting multiple modules of the same network number
When multiple RJ71GN11-T2s of the same network number are mounted, the target of the direct access to link devices is the
module that has the smallest slot number in the base unit.
■Link direct device in a multiple CPU system
In a multiple CPU system, link direct devices cannot be used for the CC-Link IE Controller Network-equipped module
controlled by another CPU module.
1 FUNCTIONS
34
1.1 Cyclic Transmission