User manual

IEC61131 User and Reference Manual
April 22, 2008
496
Data Link Layer parameters are set in this property page. Each parameter is described in the
following paragraphs.
The Master Station Addresses list box contains a list of Master station addresses that the
SCADAPack controller will respond to. The default list contains one master address of 100. This
address may be edited, or changed, and up to 8 master stations may be added to the list. Valid entries
for Master Station Addresses are 0 to 65519.
 When a master station polls for event data, the controller will respond with any events that have
not yet been reported to that master station.
 When an unsolicited response becomes due, it will be sent to each configured master station in
turn. A complete unsolicited response message transaction, including retries, will be sent to the
first configured master station. When this transaction has finished, a complete unsolicited
response message transaction including retries will be sent to the next configured master station,
and so on for all the configured master stations.
 Change events will be retained in the event buffer until they have been successfully reported to
all configured master stations.
Select the Add button to enter a new address to the Master Station Address list. Selecting the Add
button opens the Add Master Station Address dialog. Up to 8 entries can be added to the table. An
error message is displayed if the table is full.
Select the Edit button to edit address in the Master Station Address list. Selecting the Edit button
opens the Edit Master Station Address dialog. The button is disabled if there are no entries in the
list.