Documentation - Hitachi Relion 670 Series Communication Protocol Manual

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1MRK511391-UUS Rev. L

Application layer

The application layer is responsible for performing operations on data objects defined by the device or on

the device itself. These operations include returning actual values (read function), assigning new values

(write function) if the object represents control points, arming and energizing the output point (select,

operate or direct operate functions) and if counters are used, reading actual values and clearing the

counters. DNP3 uses the term point to identify an entity, and these entities can be categorized into point-

types, such as analogs or binaries. Points are addressed by giving them an index number and an object

is a formatted representation of data from a point. These objects can be assigned to classes in order to

organize events and current values into categories. The DNP3 protocol defines four data classes to

organize data reporting.

Communication modes

The IED supports four DNP3 communication modes.

•

Quiescent operation

•

Unsolicited report-by-exception operation

•

Polled report-by-exception operation

•

Polled static operation

2.2

Documentation

This implementation of DNP3 is fully compliant with DNP3 Subset Definition Level 2, and contains

significant functionality beyond Subset Level 2. See the device profile for further information.

DNP, 670 series

Communication protocol manual

Section 2

DNP3 overview

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