This manual describes the Distributed Network Protocol (DNP) V3.00 as implemented in the DNP master driver for MOSCAD. The driver conforms to the Level 3 specifications provided in DNP V3.00 Subset Definitions by Harris Canada, Inc. (document number P009-0IG.SUB). This manual covers the DNP implementation for both MOSCAD V3.70 or later and MOSCAD-L V1.00 or later. It explains how the DNP protocol functions in relation to reading from and writing to the RTU database. The manual is, therefore, intended for MOSCAD application programmers.

The driver described in this manual represents an implementation of DNP V3.00 Level 3 for communicating between a master and an Intelligent Equipment Device (IED), such as RTU. The driver satisfies the requirements of the DNP V3.00 Level 3. Two drivers are supported: DNP and DNP+.

The DNP+ driver enhances the standard DNP 3.0 protocol with a set of features that are currently included only as a part of the MDLC protocol. Some of these features are: Remote diagnostics of the RTUs, efficient time synchronization, remote monitoring of applications, and uploading and downloading updated parameters. This allows the

MOSCAD ToolBox user to communicate via MDLC-coded messages over the physical channel, with the MDLC-enabled capabilities of the MOSCAD. DNP-aware IEDs use that same physical channel to communicate with other DNP-aware devices. The DNP+ time synchronization is very accurate but in that DNP+ port, time synchronization can be done only via the DNP 3.0 protocol. The DNP+ driver implements the DNP 3.0 channel access mechanism, while the DNP driver does not.

The DNP+ protocol includes advanced features which are defined in the DNP 3.0 and MDLC protocols. To achieve seamless communication over the RF network, the combined system uses the DNP 3.0 type channel access mechanism and time synchronization for both the MOSCAD and the DNP 3.0 type components. Unique features such as remote diagnostics of RTUs, remote monitoring of applications, upload and download of updated parameters, use the MDLC protocol, and these features are available only for MOSCAD devices.

Download