Mitsubishi Electric Q12DCCPU-V - Reducing the Link Device Refresh Time; Concept of Refresh Range (Points)

5
ACCESS VIA NETWORK MODULES
5.3 MELSECNET/H Module Access Function
5.3.5 Link data transfer processing time specifications
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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
(3) Reducing the link device refresh time
The link device refresh time can be reduced by decreasing the number of refresh
points for the C Controller module. To decrease the refresh points, modify the refresh
and network range assignment parameter settings and use the direct access method
for accessing link devices.
(a) Concept of refresh range (points)
Within the range set with refresh parameters in the <<Parameter settings>> tab of
MELSECNET/H utility, the areas set in the network range assignment are
refreshed.
POINT
The range from the first address to the last address is set by default in the refresh
parameter setting.
(To bring the setting back to the default, click the Default button on the Refresh
parameter settings screen activated from the <<Parameter settings>> tab of
MELSECNET/H utility.)
Figure 5.33 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
Internal link
device buffers
(Empty)
Station
No.2
Station
No.3
Station
No.1
(Empty)
Range set by
network range
assignment
Range set by
refresh
parameters