Benefits of a Modern SCADA Protocol DNP3 vs Modbus

A protocol is simply the rules that govern the data transfer between parts of a control system. Differentprotocols have varying strengths and weaknesses.This document looks at the ideas behind good protocols for the users of SCADA / telemetry systems.This is an area often neglected by users when first investing in a SCADA system, as they are oftenhappy to get any data from remote stations. However, it is important to give protocol choice properconsideration.DNP3 provides distinct advantages over Modbus and other protocols, even for the average user. Userswill usually conclude that the advantages of DNP3 outweigh the additional initial investment.If you don’t want to lose valuable data, or carry out extensive detective work to assess whether trendsand reports are demonstrating system problems, station problems – or communication problems, thenyou need a protocol that reliably reports all changes from the field.

A protocol is simply the rules that govern the data transfer between parts of a control system. Different protocols have varying strengths and weaknesses.

This document looks at the ideas behind good protocols for the users of SCADA / telemetry systems.This is an area often neglected by users when first investing in a SCADA system, as they are often happy to get any data from remote stations. However, it is important to give protocol choice proper consideration.

DNP3 provides distinct advantages over Modbus and other protocols, even for the average user. Users will usually conclude that the advantages of DNP3 outweigh the additional initial investment.

If you don’t want to lose valuable data, or carry out extensive detective work to assess whether trends and reports are demonstrating system problems, station problems – or communication problems, then you need a protocol that reliably reports all changes from the field.

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