4
FUNCTIONS
4.4 MELSECNET/H Module Access Function
4.4.5 Link data send/receive processing time specifications
4 - 38
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
SETTING AND
PROCEDURES
6
I/O NUMBER
ASSIGNMENT
7
MEMORIES AND
FILES
8
INSTALLING /
UNINSTALLING
(3) Reduction of link device refresh time
The link device refresh time can be shortened by reducing the number of refresh
points to the C Controller module, setting proper refresh parameters/network range
assignment parameters and making direct access to the link devices.
(a) Concept of refresh range (points)
Within the range set in the refresh parameters, the range of all stations set in the
network range assignment parameters (Stations 1 to 3) covering "first address to
last address" is refreshed.
POINT
The range from the first to the last addresses is set as the initial setting of the
refresh parameters (Clicking the Default button on the Refresh parameter setting
screen on the <<Parameter setting>> tab of the MELSECNET/H utility brings it
back to the initial setting).
Figure 4.34 Concept of refresh range
C Controller module
Range to be
actually
refreshed
Applicable
as internal
memory
Applicable
as internal
memory
Applicable
as internal
memory
Link device
refresh
Link device
refresh
Link device
refresh
MELSECNET/H module
Network range
assignment parameter
(Empty)
Station
No.2
Station
No.3
Station
No.1
(Empty)
Range set by
network range
assignment
Link device
internal buffer
Range set by
refresh
parameters
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