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CHAPTER 4 FUNCTIONS
4
4.1 Cyclic Transmission Function
4.1.3 Link refresh
4.1.3 Link refresh
This function allows automatic data transfer between the link devices of the CC-Link IE Controller Network module and
CPU module devices.
Set the link refresh range in the refresh parameter of each station. ( Page 204, Section 6.5)
The link devices of the CC-Link IE Controller Network module can be read or written directly by the sequence program.
Direct access to the link devices reduces the link refresh time and transmission delay time. ( Page 70, Section 4.1.4)
(1) Concept of the link refresh range (points)
The range set with refresh parameters and specified in the network range assignment is link-refreshed.
● To assure cyclic data integrity of data exceeding 32 bits, execute station-based block data assurance or configure an
interlock program. ( Page 76, Section 4.1.5)
● When a shorter link refresh time is desired
The link refresh time can be shortened by reducing the points of the link refresh to the CPU module.
The following are the methods for reducing the link refresh points.
• In the Refresh parameters, specify only the link devices used in the CPU module as the link refresh range.
( Page 204, Section 6.5)
• Remove any infrequently used link devices from the link refresh range, and directly read or write them using link
direct devices. ( Page 70, Section 4.1.4)
CPU module
B
Range set
by refresh
parameters
CC-Link IE Controller
Network module
LB
Link refresh
Link refresh
Link refresh
1MP1
1N
S2
Empty
Empty
1N
S3
Actual link
refresh range
(points)
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