4
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4.1 Cyclic Transmission Function
4.1.3 Link refresh
4
FUNCTIONS
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.
The link refresh range is set up in [Refresh parameters] of each station.
Section 6.4 Refresh Parameters
POINT
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.
Section 4.1.4 Direct access to link devices
(1) Concept of the link refresh range (points)
The range set with refresh parameters and specified in the network range assignment
is link-refreshed.
POINT
(1) When assurance of cyclic data integrity of more than 32 bits is desired
Section 4.1.5 Assurance of cyclic data integrity
(2) 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.
Section 6.4 Refresh Parameters
• Remove any infrequently used link devices from the link refresh range,
and directly read or write them using link direct devices.
Section 4.1.4 Direct access to link devices
Figure 4.11 Concept of the link refresh range (points)
CPU module
B
Range set
by refresh
parameters
CC-Link IE controller
network module
LB
Link refresh
Link refresh
Link refresh
Link refresh
Link refresh
Link refresh
1M
P
1
1N
S
2
Empty
Empty
1N
S
3
Actual link
refresh range
(points)
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