Link Refresh - Mitsubishi Electric MELSEC Q Series Reference Manual

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. (
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. (
(1) Concept of the link refresh range (points)
The range set with refresh parameters and specified in the network range assignment is link-refreshed.
Range set
by refresh
parameters
● To assure cyclic data integrity of data exceeding 32 bits, execute station-based block data assurance or configure an
interlock program. (
● 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.
(
• Remove any infrequently used link devices from the link refresh range, and directly read or write them using link
direct devices. (
CPU module
Actual link
refresh range
(points)
Page 76, Section 4.1.5)
Page 204, Section 6.5)
Page 70, Section 4.1.4)
Page 204, Section 6.5)
CC-Link IE Controller
Network module
B
Link refresh Link refresh
Link refresh Link refresh
Link refresh Link refresh
CHAPTER 4 FUNCTIONS
Page 70, Section 4.1.4)
LB
1M 1
P
Empty
1N 2
S
Empty
1N 3
S
4
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