However this protocol tends to become more complex with increased number of RTUs and interconnection. The DNP3 protocol has the added advantage of supporting RTUs of different nature and complexity through four levels of subsets of the protocols for RTU compliance. The DNP Protocol performs time synchronization with RTU, where time stamped variants of all data point objects are reconstructed through a sequence of events. DNP3 has good ability to handle error detection. DNP3 has improved bandwidth efficiency which is accomplished through event oriented data reporting.ĥ. DNP3 provides a transport function (layer 4) and Application layer (Layer 7) corresponding to SCADA applications.Ĥ. DNP3, with reference to the widely used OSI model for communicating networks, corresponds to layer 2, which provides multiplexing of various features like error checking, link control, data fragmentation, etc.ģ. This makes it more efficient and efficient for communicating between components in SCADA systems.Ģ. DNP3 protocol is characterised by important features that makes it inter-operable with related protocols like MODBUS, etc. Presently it is in complaint with IEC 62315-5 and is regarded as a a set of best practices for implementing SCADA-RTU master station communications. There was a need to introduce security authentication to the DNP3 protocol. Security of these protocols is an important aspect to be considered.ĭNP3 protocols were not designed to be secure from hackers and threats. IEC 60870 was primarily design to allow important reliable communication between in electric utility automation systems under situations of information distortion and transmission. ICCP is a part of IEC 60870 and is widely used in inter- master station communications. This protocol forms an integral part in SCADA systems while interconnecting the RTUs and IEDs named as the Inter –Control Center Communications (ICCP) protocol. The purpose of DNP3 is to accomplish communication between various types of monitoring, data acquisition systems and control equipment. DNP3 stands for distributed network protocol and it consist of a set of communication protocols used between components which are used in process automation systems like electric utility, chemical process plants, etc.
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