By Gordon Clarke CP Eng BEng MBA, Deon Reynders Pr Eng BSc (ElecEng) (Hons) MBA
SCADA (Supervisory keep an eye on and information Acquisition) structures are on the middle of the fashionable commercial firm starting from mining vegetation, water and electric software installations to grease and fuel crops. In a industry that's crowded with high-level monographs and reference publications, simpler info for pro engineers is needed. This publication covers the necessities of SCADA communique structures focussing on DNP3, the IEC 60870.5 average and different new advancements during this zone. It commences with a short overview of the basics of SCADA structures' undefined, software program and the communications structures (such as RS-232, RS-485, Ethernet and TCP/IP) that attach the SCADA Modules jointly. an outstanding assessment is then performed at the DNP3 and IEC 60870.5 protocols the place its beneficial properties, message constitution, sensible advantages and purposes are mentioned. This booklet offers you the information to layout your subsequent SCADA procedure extra successfully with a spotlight on utilizing the most recent communications applied sciences to be had. * Covers the necessities of SCADA conversation platforms and different new advancements during this sector * Covers quite a lot of professional networking themes and different issues excellent for working towards engineers and technicians seeking to extra and improve their wisdom of the topic * tremendous well timed topic because the has made a powerful circulate in the direction of ordinary protocols in smooth SCADA communications structures
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Additional info for Practical Modern SCADA Protocols: DNP3, 60870.5 and Related Systems
20 Illustration of polling techniques for master station and RTUs Fundamentals of SCADA communications 33 An example of a high and normal priority arrangement is given in the diagram below. 21 High and normal priority arrangement A priority message sent from the master station can override the standard polling sequence. In this case the master station completes the poll request for a specific station and then sends out the priority request to a specific station (which was not necessarily next in the polling sequence).
For example this could be items such as the status of the battery, whether memory protect has been enabled or the status of the remote input/output racks connected to the system. Loopback test (function code 08) The objective of this function code is to test the operation of the communications system without affecting the memory tables of the slave device. It is also possible to implement additional diagnostic features in a slave device (should this be considered necessary) such as number of CRC errors, number of exception responses etc.
In originate mode, DTE ready must be asserted in order to auto dial. In answer mode, DTE ready must be asserted to auto answer. Pin 22 – Ring indicator This pin is asserted during a ring on the line. Pin 23 – Data signal rate selector (DSRS) When two data rates are possible, the higher is selected by asserting pin 23. 5 The sequence of asynchronous operation of the RS-232 interface Asynchronous operation is arguably the more common approach when using RS-232 and will be examined in this section using the more complex half-duplex data interchange.