User manual

IEC61131 User and Reference Manual
April 22, 2008
498
Master
The Master property page is selected for editing by clicking Master in the tree control section of the
DNP Settings window. This selection is only visible if the controller type is SCADAPack 330/334,
SCADAPack 350, SCADAPack 32 or SCADAPack 32P. These controllers support DNP Master.
When selected the Master Application Link Layer property page is active.
Master parameters are set in this property page. Each parameter is described in the following
paragraphs.
The Mimic Mode parameter specifies the DNP Mimic Mode. The valid selections are Enable or
Disable. When DNP Mimic Mode is enabled the controller will intercept DNP messages destined for
a remote DNP station address, and will respond directly, as though the controller were the designated
target. For read commands, the controller will respond with data from its Remote DNP Objects
corresponding with the intended target address. For write commands, the controller will write data
into its Remote DNP Objects, and issue a direct response to acknowledge the command. It will then
issue a new command to write the data to the designated target. See Section 0-SCADAPack DNP
Mimic Master section for an explanation of the concept around Mimic Mode. The default selection
is Disabled.
The Base Poll Interval parameter is the base interval (in seconds) for polling slave devices. The poll
rates and issuing time synchronisation will be configured in multiples of the base poll interval. The
slave devices with the same poll rates will be polled in the order they appear in the poll table. The
valid values for this parameter are 1 to 65535. The default value is 10 seconds.