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Description
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All or part of the description applies to each model.
The description applies to each model with some restrictions.
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5
ACCESS VIA NETWORK MODULES
5.4 CC-Link IE Controller Network Module Access Function
5.4.4 Link device refresh setting
5 - 48
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
ACCESS VIA NETWORK
MODULES
6
PREPARATORY
PROCEDURES AND
SETTING
7
I/O NUMBER
ASSIGNMENT
8
MEMORIES AND FILES
5.4.4 Link device refresh setting
Link device refresh setting is required when using the internal buffer access in user
programs.
To enable the link device refresh, set a link device refresh cycle and refresh parameters in
CC IE Control utility.
(1) Link device refresh cycle
The link device refresh cycle is an interval of time during which the internal link device
buffers of the C Controller module and link devices of a CC-Link IE controller network
module are refreshed.
The concept of the link device refresh cycle is shown below.
(a) Total link device refresh time
1) What is total link device refresh time?
This is a processing time for refreshing the link devices of all CC-Link IE
controller network modules that are controlled by the C Controller module.
2) How to obtain the total link device refresh time
A theoretical value for the total link device refresh time can be obtained by a
calculation formula. ( Page 5-59, Section 5.4.5 (1) (b))
Figure 5.45 Conceptual diagram of link device refresh cycle
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C Controller
module processing
Link device
refresh
Link device
refresh
Link device
refresh
Link device
refresh
Link scan
Start End
Link device
refresh
Link device
refresh cycle
Link device
refresh cycle
Link device
refresh cycle
Total link device refresh time
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