User manual

IEC61131 User and Reference Manual
April 22, 2008
501
Add/Edit Master Poll Dialog
This dialog is used to edit an entry or add a new entry in the Master Poll.
The Station edit control displays the address of the DNP slave device to be polled. Valid values are
0 to 65519.
The Class 0 Polling section of the dialog specifies the type and rate of polling for Class 0 data.
 The None selection disables class 0 polling for the slave station. This is the default selection.
 The At Start Up Only selection will cause the master to poll the slave station at startup only.
 The Interval selection will cause the master to poll the slave station at startup and then every
Interval of the base poll interval. For example if the base poll interval is 60 seconds and the
Interval parameter is set to 60 then the master will poll the slave station every hour. Valid values
are 1 to 32767. The default value is 60.
 The Poll Offset parameter is used to distribute the load on the communication network. The Poll
Offset is entered in multiples of the base poll interval. Valid values for this parameter are 0 to the
Poll Interval value minus 1. Any non-zero value delays the start of polling for the specified
objects by that amount. The default value is 0. This control is disabled when None is selected,
and enabled otherwise. For an example of using the Poll Offset parameter see the Poll Offset
Example at the end of this section.
The Class 1 Polling section of the dialog specifies the type and rate of polling for Class 1 data.
 The None selection disables class 1 polling for the slave station. This is the default selection.
 The At Start Up Only selection will cause the master to poll the slave station at startup only.
 The Interval selection will cause the master to poll the slave station at startup and then every
Interval of the base poll interval. For example if the base poll interval is 60 seconds and the