Practical Modern SCADA Protocols: DNP3, IEC 60870.5, and by Gordon Clarke, Deon Reynders

By Gordon Clarke, Deon Reynders

SCADA (Supervisory keep an eye on and knowledge Acquisition) platforms are on the middle of the fashionable commercial company starting from mining crops, water and electric software installations to grease and gasoline crops. In a industry that's crowded with high-level monographs and reference publications, simpler info for pro engineers is needed. This e-book covers the necessities of SCADA communique structures focussing on DNP3, the IEC 60870.5 ordinary and different new advancements during this sector. It commences with a short assessment of the basics of SCADA systems' undefined, software program and the communications platforms (such as RS-232, RS-485, Ethernet and TCP/IP) that attach the SCADA Modules jointly. an outstanding evaluation is then performed at the DNP3 and IEC 60870.5 protocols the place its positive factors, message constitution, sensible merits and purposes are mentioned. This booklet provide you with the data to layout your subsequent SCADA method extra successfully with a spotlight on utilizing the most recent communications applied sciences available.

* Covers the necessities of SCADA conversation platforms and different new advancements during this area

* Covers a variety of professional networking themes and different issues excellent for practising engineers and technicians trying to extra and advance their wisdom of the subject

* super well timed topic because the has made a powerful circulate in the direction of common protocols in smooth SCADA communications platforms

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Extra info for Practical Modern SCADA Protocols: DNP3, IEC 60870.5, and Related Systems

Example text

Normally, the master can send another query as soon as it has received the response message. A timeout function ensures that the system still functions when the query is not received correctly. g. for testing • RTU – compact and faster; used for normal operation (hex) The RTU mode (sometime also referred to as Modbus-B for Modbus Binary) is the preferred Modbus mode and will be discussed in this section. The ASCII transmission mode has a typical message that is about twice the length of the equivalent RTU message.

7 Basic standards: RS-232 and RS-485 RS-232 and RS-485 form the key element in transferring digital information between the RTUs (or operator terminals), and the modems which convert the digital information to the appropriate analog form suitable for transmission over greater distances. An interface standard defines the electrical and mechanical details that allow communications equipment from different manufacturers to be connected together and to function efficiently. It should be emphasized that RS-232, and the other related EIA standards, define only the electrical and mechanical details of the interface and do not define a protocol.

This requires the transmitter to insert a 0 after a sequence of five 1s in the text, so that the flag character can never appear in the message text. The receiver removes the inserted zeros • The frame check sequence (FCS) uses the CRC-CCITT methodology, except that sixteen 1s are added to the tail of the message before the CRC calculation proceeds, and the remainder is inverted • The address field can contain one of three types of address for the request or response messages to or from the secondary node.

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