DNP is an acronym for Distributed Network Protocol, an open protocol used by components in process automation systems.

A protocol defines the rules by which devices talk to each other. DNP3 is a protocol for transmitting data from Point A to Point B via serial and IP communications. Although DNP is most commonly used by electric, gas, water and wastewater utilities, it can be used anywhere a SCADA system is exists.

Why Do Devices Need to Talk to Each Other?
Utility providers commonly have lots of operations they need to monitor. Typically, there is a central operations center plus remote equipment in the field.  The central operations center houses their main computer.  Installations/substations house remote equipment in the field.  DNP is used to facilitate communication between the main computer and remote equipment, enabling the main computer to remotely open/close circuit breakers, measure line voltages, start/stop motors, open/close valves, check for errors, etc.

View Previous Blog Series on DNP3:

DNP3 Part 1 – Date/Time Stamping

DNP3 Part 2 – Communications Options

DNP3 Part 3 – Security

DNP3 Part 4 – Reliability

DNP3 Part 5 – Compliance

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