Mitsubishi Electric Q12DCCPU-V User Manual page 202

5
ACCESS VIA NETWORK MODULES
5.4.4
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
5
- 48 5.4 CC-Link IE Controller Network Module Access Function
5.4.4 Link device refresh setting
Link device refresh setting
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.
Link device
refresh cycle
Link device
refresh
Start End
C Controller
module processing
Link device Link device
refresh refresh
Link scan
Figure 5.45 Conceptual diagram of link device refresh cycle
(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. (
Q12DCCPU-V
Link device Link device
refresh cycle refresh cycle
Link device Link device
refresh refresh
Page 5-59, Section 5.4.5 (1) (b))
Q06CCPU-V Q06CCPU-V-B
Total link device refresh time