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6
MELSECNET/H UTILITY
(6) Supplementary settings screen
Item
Constant scan
Max. number of returned stations per
scan
With multiplex transmission
There is a data link thorough the sub-
controlling station when the controlling
station is down.
Block send data assurance per station
Block receive data assurance per
station
6
- 37
6.6 Parameter Settings Tab
The supplementary settings is used for advanced settings.
Default values can be applied for normal usage.
Figure 6.24 Supplementary settings screen
Table 6.31 Description of the Supplementary settings screen
Constant scan is used to maintain the link scan time at a constant time.
Set a value to prevent fluctuation of the link scan time. (Unit: ms)
(Default: "(Blank)"), Setting range: 1 to 500
Set the number of communication error stations that can return during one link scan.
(Default: 2, Setting range: 1 to 64 ("Total stations" setting))
"Total station" can be set in the "Network range assignment" field in the Parameter settings tab.
(
Page 6-27, Section 6.6 (2))
Select this when executing the multiplex transmission function.
Multiplex transmission is used in the optical loop system to increase the transmission speed by
using both the forward and reverse loops simultaneously when they are in a normal condition.
This setting is available only when "Total stations" is set to 4 or more.
"Total station" can be set in the "Network range assignment" field in the Parameter settings tab.
(
Page 6-27, Section 6.6 (2))
(Default: Not selected (Not execute))
Select this when allowing another normal station on the network to continue communication (the
control station switch function) as a alternate station (sub-control station) when the specified control
station is disconnected due to some fault.
(Default: Selected (Enable the control station switch function))
Select this when securing consistency
This enables to handle multiple word data without providing interlocks in the program.
Note that this function
Controller module and MELSECNET/H module.
Set the following parameters when selecting any of these items for assuring data per station.
•"Link device refresh cycle" in the "Parameter settings" tab.
(
Page 6-27, Section 6.6 (2))
•Refresh parameters in the "Refresh parameter settings" tab.
(
Page 6-33, Section 6.6 (4))
(Default:
Page 6-38, Section 6.6 (6) (a))
* 1 Securing consistency means preventing 2-word (32 bits) link data, such as the current value of the
positioning module, from being divided into new and old data in units of 1 word (16 bits) due to
cyclic transmission timing.
The link device refresh processing between the C Controller module and MELSECNET/H module
can be set in the "Refresh parameter settings" tab. (
Description
*1
of link data for each station in cyclic transmission.
*1
can be used only for the link device refresh processing between the C
Page 6-33, Section 6.6 (4)).
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