Yokogawa YFGW410 - Manual (Page 116)

D3-55
IM 01W02D01-01EN
Item Description
Default set-
ting
Update Policy
Select the method to update data from the following two methods.
Periodic : Update periodically
Change of state : Update with change of state
Periodic
Publication Period (Sec)
Select the update time to periodically publish data from the drop-
down box. The setting range is from 0 to 3,600 seconds. When
“0” is selected, there is no publication.
10 Sec
Stale Limit (Times)
Set the time for a YFGW410 to determine transmission error. Set
a multiple of the Publication Period setting. Select a setting from 1
to 255 from the drop-down box.
10 Times
Retry Mode
Set the retry frequency when the published data is not correctly
received. Select from Normal and x2(two times Normal)
Normal
Destination for data
Display the general name of the receiver of data
For read parameters: Gateway(YFGW410)
For write parameters: Selected Field Devices
You can register and delete data in the Read Parameters area using the arrow buttons between
the two sections.
To individually add parameters in the Available Parameters tree not registered under the [Read
Parameters] tree, select the relevant parameter ([PV] or [DIAG_STATUS] in the tree), and then
click the button. To add all parameters under the UAP ID, select the UAP ID, and then click
the button.
Conversely, to individually delete parameters registered under the parameters in the Read
Parameter tree, select the name of the parameter to be deleted, and then click the button.
When the button is clicked, all of the parameter names below the parameter are deleted.
 Publication Period and Stale Limit
• Publication Period
A publication period refers to a period at which data is transmitted and received between
YFGW410 and the field wireless device.
Determine the publication period considering battery power consumption (which varies
depending on the publication period) or other factors.
• Stale Limit
The check process of wireless communication, the operating environment of the system,
deterioration of wireless quality, and communication path error and restoration may cause
data loss, retransmission of the same data, or variations in the data update time.
When the state of not-updated-data or lost-data continues for the period specified in Stale
Limit, YFGW410 considers that an error has occurred and notifies the control system of an
error.
It is recommended to set a value 10 times as large as the publication period. However, de-
termine the value considering the fact that the time from when the state of data-not-updated
or data-lost occurs until the determination of an error varies depending on the system envi-
ronment and user application.
IMPORTANT
Always register the CF file, even when data is not published periodically. Alternatively, set Publi-
cation Period to “0”.