{"id":1784,"date":"2009-12-18T02:17:27","date_gmt":"2009-12-18T02:17:27","guid":{"rendered":"http:\/\/instrumentacionycontrol.net\/?p=1784"},"modified":"2022-01-11T13:08:36","modified_gmt":"2022-01-11T18:08:36","slug":"selection-of-topologies-and-transmission-modes-in-scada-systems","status":"publish","type":"post","link":"https:\/\/instrumentacionycontrol.net\/en\/seleccion-de-topologias-y-modos-de-transmision-en-sistemas-scada\/","title":{"rendered":"Selection of Topologies and Transmission Modes in SCADA Systems"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The communication loop is only between two stations. Either station can initiate communication, or it can be configured so that one station controls the other.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Topology is the geometric arrangement of nodes and loops that form a network. The following topologies are the most commonly used by a SCADA system:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A) POINT TO POINT<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The communication loop is only between two stations. Either station can initiate communication, or it can be configured so that one station controls the other.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"356\" height=\"72\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-Lazo-de-comunicacion-es-solo-entre-dos-estaciones.gif\" alt=\"\" class=\"wp-image-1788\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Stations can be connected using permanent cables or a dedicated public line. The dedicated line can be analog or digital. Temporary connections such as dial-up lines, microwave, radio, or satellite transmissions can also be used.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Select this topology if you need a direct connection to the remote station. In these cases, redundancy systems must be considered as part of the system design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two-wire means that the transmission medium uses two wires for both transmitting and receiving the signal. For example, a public telephone line uses two wires to establish a connection between two users.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B) POINT TO MULTIPOINT (MULTIDROP)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The communication loop involves three or more stations, and the master station, which controls communication with the remote stations, initiates the communication.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"360\" height=\"173\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-B.gif\" alt=\"\" class=\"wp-image-1789\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Communication can be established using a public analog or digital line. Atmospheric media such as microwaves, radio, or satellite can also be used.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This topology is the most commonly used by SCADA. Four lines means that the transmission medium uses two lines for transmitting and two lines for receiving the signal. Public service providers typically enable the use of all four communication lines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C) MULTIPOINT TO MULTIPOINT<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The communication loop is between three or more stations where the master station does not necessarily initiate communication with the other stations.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"390\" height=\"269\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-C.gif\" alt=\"\" class=\"wp-image-1790\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This is a special topology used by some radio modem providers. It facilitates point-to-point communication between stations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>TRANSMISSION MODE SELECTION<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The transmission mode is the way information is sent and received between network devices. For SCADA systems, the network topology generally determines the data transmission mode.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When using a point-to-multipoint topology, the transmission mode is half-duplex. This means:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"337\" height=\"107\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-D.gif\" alt=\"\" class=\"wp-image-1792\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">When you have a point-to-point topology, the transmission mode is full-duplex. This means:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"313\" height=\"91\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-E.gif\" alt=\"\" class=\"wp-image-1794\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">In a multipoint-to-multipoint topology, the transmission mode is full-duplex between stations and modems, and half-duplex between modems. This means:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"366\" height=\"165\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-F.gif\" alt=\"\" class=\"wp-image-1795\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SELECTION OF A MEDIA OUTLET<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Select a media outlet taking the following into consideration:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Application transmission needs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Control center locations and remote sites.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Distances between sites.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Available services.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Budget allocated to the project.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Types of media available:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a) PUBLIC SWITCHED TELEPHONE NETWORK (PSTN)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The dial-up network is provided by a telephone company. We use the telephone line every day, and it allows for the transmission of voice and data.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In Peru the provider is Telef\u00f3nica del Per\u00fa, but currently we have other providers such as BellSouth, TIM, etc.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Advantages and capabilities:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 It is useful if little data collection is required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Access to a public phone line is available.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The telephone company charges a monthly fee for the service. The cost depends on the number of connections and the connection time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The communications network achieves a speed of up to 56,000 bps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The network is a two-wire cable that supports a half-duplex and full-duplex connection if the connection is point-to-point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Disadvantages:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Transmission is expensive if larger volumes of information are required from remote sites.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The modem connection may cause errors; the transmission rate is 1 error per 1,000,000 bits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 The medium cannot be used in locations where this service is not available.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Time is required for connection (dialing) and connection establishment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 Additional logic is required for automatic connection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use Bell Standard or Consultative Committee for International Telephones and Modems (CCITT).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b) PRIVATE LEASED LINE (PLL)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is a dedicated telephone line that maintains a constant connection between two or more locations using analog transmission. The line is available 24 hours a day and is typically used for voice and data transmission.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"173\" height=\"65\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-G.gif\" alt=\"\" class=\"wp-image-1796\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) DIGITAL DATA SERVICES (DDS)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It&#039;s a private line with a special bandwidth that uses digital technology to transfer data at high speeds and with low error rates using a dedicated private line. The line is available 24 hours a day.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"280\" height=\"128\" src=\"http:\/\/instrumentacionycontrol.net\/wp-content\/uploads\/2017\/10\/Fig-H.jpg\" alt=\"\" class=\"wp-image-1798\"\/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Help us grow<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Finally, if you are determined to learn Industrial Automation and advance your professional career, you may be interested in our Premium courses:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2013 Click to see all our courses at <a rel=\"noreferrer noopener\" href=\"https:\/\/myautomationclass.com\/?utm_source=iycnet&amp;utm_medium=post&amp;utm_campaign=footer_link_post\" target=\"_blank\">MyAutomationClass.com<\/a><br>- Course: <a rel=\"noreferrer noopener\" href=\"https:\/\/myautomationclass.com\/p\/aprende-plcs-desde-cero-con-rslogix500-basico-avanzado?utm_source=iycnet&amp;utm_medium=post&amp;utm_campaign=footer_link_post\" target=\"_blank\">\u00ab&quot;Become a PLC expert in 60 days, from basic to pro&quot;\u00bb<\/a><br>- Course: <a rel=\"noreferrer noopener\" href=\"https:\/\/myautomationclass.com\/p\/aprende-controladores-pid-de-manera-practica?utm_source=iycnet&amp;utm_medium=post&amp;utm_campaign=footer_link_post\" target=\"_blank\">\u00ab&quot;PID Controllers Master Class \u2013 100% practical&quot;\u00bb<\/a><br>- Course:<a rel=\"noreferrer noopener\" href=\"https:\/\/myautomationclass.com\/p\/desarrollo-de-proyectos-scadahmi-con-wonderware-intouch?utm_source=iycnet&amp;utm_medium=post&amp;utm_campaign=footer_link_post\" target=\"_blank\"> \u00ab&quot;How to create SCADA\/HMI projects from scratch with InTouch&quot;\u00bb<\/a><br>- Course:<a rel=\"noreferrer noopener\" href=\"https:\/\/myautomationclass.com\/p\/pid-tuning-ultimate-sintonizacion?utm_source=iycnet&amp;utm_medium=post&amp;utm_campaign=footer_link_post\" target=\"_blank\"> \u00ab&quot;PID Tuning Ultimate: The Definitive Course for Tuning&quot;\u00bb<\/a><br>- Course:<a rel=\"noreferrer noopener\" href=\"https:\/\/myautomationclass.com\/p\/modelamiento-practico-de-procesos-10-pasos-impresindibles-para-ser-un-experto?utm_source=iycnet&amp;utm_medium=post&amp;utm_campaign=footer_link_post\" target=\"_blank\"> \u00ab&quot;Practical Process Modeling: Definitive Steps to Becoming an Expert&quot;\u00bb<\/a><br>- Program:<a rel=\"noreferrer noopener\" href=\"https:\/\/myautomationclass.com\/p\/the-ultimate-process-control-training-se-un-maestro-control-pid?utm_source=iycnet&amp;utm_medium=post&amp;utm_campaign=footer_link_post\" target=\"_blank\"> \u00ab&quot;The Ultimate Process Control Formula&quot; (All-inclusive: PID Control, Tuning, and Modeling)<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you have any questions, contact us via <a rel=\"noreferrer noopener\" href=\"http:\/\/m.me\/instrumentacionycontrol.net\" target=\"_blank\">Facebook Messenger<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Until next time. COMMENT AND SHARE! I&#039;ll be happy to answer your questions.<\/p>","protected":false},"excerpt":{"rendered":"<p>El lazo de comunicaci\u00f3n es s\u00f3lo entre dos estaciones. Cualquiera de las dos estaciones puede iniciar la comunicaci\u00f3n o se puede configurar para que sea una de ellas quien controle a la otra. La topolog\u00eda es el arreglo geom\u00e9trico de nodos y lazos que forman una red. Las siguientes topolog\u00edas son las m\u00e1s usadas por [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17337,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[65],"tags":[20595,181,551,718,20596],"class_list":["post-1784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curso-de-sistemas-scada","tag-modos","tag-seleccion","tag-sistemas-scada","tag-topologias","tag-transmision","post-wrapper","thrv_wrapper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Selecci\u00f3n de Topolog\u00edas y Modos de Transmisi\u00f3n en sistemas SCADA<\/title>\n<meta name=\"description\" content=\"El lazo de comunicaci\u00f3n es s\u00f3lo entre dos estaciones. 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