ProSoft Technology 5201-DFNT-DNPS - Manual (Page 59)

Reference ProLinx DNPS ♦ ProLinx Gateway
User Manual DNP 3.0 Slave
ProSoft Technology, Inc.
Page 59 of 86
December 1, 2009
DNP Digital Input Data
This data type stores the binary value of 1 or 0. The size of this data area is
determined from the configuration parameter Binary Inputs (number of words,
each containing 1 binary input point). These data are transferred to the module
from the other protocol using the read operation. Therefore, these data are read-
only for the module and the DNP master unit communicating with the module.
When the module receives a new block of this data from the other protocol, it
compares the new values to those currently in the database. If there is a change
in any of the data, the module will generate an event message for the points that
change.
The remote DNP master unit can read the current status data and the event data
from the module. Event messages generated by the module can be retrieved
using a poll for Class 2 data, as all digital input events are considered a Class 2
data type. If unsolicited message generation is enabled in the application, the
events will automatically be sent by the module to the DNP master unit when the
maximum event count for Class 2 data is reached or when the timeout for
unsolicited messages is exceeded.
The following illustration describes data flow for the digital input data.