{"id":46472,"date":"2020-03-19T09:30:36","date_gmt":"2020-03-19T04:00:36","guid":{"rendered":"https:\/\/ye1o34zhk8.onrocket.site\/?p=46472"},"modified":"2021-03-04T13:02:20","modified_gmt":"2021-03-04T07:32:20","slug":"plc-programming-using-level-switches","status":"publish","type":"post","link":"https:\/\/instrumentationtools.com\/plc-programming-using-level-switches\/","title":{"rendered":"PLC Programming using Level Switches"},"content":{"rendered":"\n<p class=\"has-normal-font-size\"><p class=\"has-normal-font-size\" style=\"text-align: justify;\">This article about &#8220;PLC programming to control the level in the tank using three point conductive level switches for motor start &amp; stop logic&#8221;. <\/p><p style=\"text-align: justify;\">The <a href=\"https:\/\/instrumentationtools.com\/advantages-disadvantages-of-level-measurement-systems\/\" target=\"_blank\" rel=\"noopener noreferrer\">level measurement<\/a> plays a vital role in every industry from small scale sectors to complex oil and gas industries. Different types of sensors available for level measurement like ultrasonic, radar, differential pressure based sensors, etc. These sensors are used for continous level measurment which scales from 0% to 100% of level.<\/p><\/p>\n\n\n\n<p class=\"has-normal-font-size\"><p style=\"text-align: justify;\">In some applications, we may need to establish a level control loop with less investment and there will be only need to maintain or control specific levels in the vessels or tanks. In these cases, we can use simple level switches for controlling the level at fixed points like Low, Medium, and High levels.<\/p><\/p>\n\n\n\n<p class=\"has-normal-font-size\"><p style=\"text-align: justify;\">Here in our example, we are using a three probes type conductive level switches for <a href=\"https:\/\/instrumentationtools.com\/point-level-detection-working-principle\/\" target=\"_blank\" rel=\"noopener noreferrer\">point level detection<\/a>. A Programmable logic controller (PLC) is used to control the motor based on the level switches status. These level witches are inexpensiive and needs less maintenance. Three lamps are used to indicate the level switches status. <\/p><h2 style=\"text-align: left;\">PLC Programming using Level Switches<\/h2><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"814\" height=\"563\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2020\/01\/PLC-Programming-for-Level-Switches.png\" alt=\"PLC Programming using Level Switches\" class=\"wp-image-46473\" title=\"PLC Programming using Level Switches\"\/><\/figure>\n\n\n\n<p><h2 style=\"text-align: justify;\">PLC Problem<\/h2><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>When the level is low then the motor (pump) will remain ON till high level reaches, lamp L1 also turns ON and gives an indication of the low level, It will remain ON till it reaches a half level (medium level).<\/li><li>When the level reaches half (medium level) then the L2 lamp will turn ON &amp; give an indication of half level. L1 goes OFF and the pump will remain ON.<\/li><li>When the level reaches to high level then the pump goes OFF and lamp L3 will turn ON.<\/li><\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Inputs:<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Low Level Switch \u2013 S1_LL (I0.0),<\/li><li>Medium or Half Level Switch \u2013 S2_HL (I0.2),<\/li><li>High Level Switch \u2013 S3_HL (I0.3)<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Outputs:<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>PUMP (Q4.0),<\/li><li>Low Level Lamp Indication (L1) \u2013 LL_LAMP1 (Q4.1),<\/li><li>Medium or Half Level Lamp Indication (L2) \u2013 HL_LAMP2 (Q4.2),<\/li><li>High Level Lamp Indication (L3) \u2013 HL_LAMP3 (Q4.3)<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Ladder Logic<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"872\" height=\"948\" src=\"https:\/\/instrumentationtools.com\/wp-content\/uploads\/2020\/03\/PLC-logic-for-Level-controlling.png\" alt=\"PLC logic for Level controlling\" class=\"wp-image-47553\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-plc-logic-description\">PLC Logic Description<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-network-1\">Network 1:<\/h4>\n\n\n\n<p><p style=\"text-align: justify;\">when level is low (S1), lamp 1 (LL_LAMP 1) and pump will be ON. Lamp indication of low level is set to ON till level reaches medium <a href=\"https:\/\/instrumentationforum.com\/t\/different-types-of-level-sensors-and-their-working-principle\/6232\" target=\"_blank\" rel=\"noopener noreferrer\">level<\/a> then it will reset (OFF). Normally closed (NC) contact of S3 is used to prevent lamp to turning on together.<\/p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-network-2\">Network 2:<\/h4>\n\n\n\n<p><p style=\"text-align: justify;\">When the level reaches a medium level (S2) then lamp 2 will turn ON and pump will remain ON.<span style=\"font-size: inherit;\"> <\/span>Lamp of low level indication will reset (OFF) when level reaches medium level. Same as 1<sup>st<\/sup> network NC contact is used for Interlocking purpose.<\/p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-network-3\">Network 3:<\/h4>\n\n\n\n<p><p style=\"text-align: justify;\">When the level reaches high level (S3) then pump will turn OFF and high indication lamp will turn ON.\u00a0<span style=\"font-size: inherit;\"> <\/span>As the lamp 3 is ON, the motor will be de-energized &amp; lamp 2 indication will be OFF because lamp 3 NC contact becomes open in the network 1 &amp; 2.<\/p><\/p>\n\n\n\n<p><p style=\"text-align: justify;\">Author: Suhel Patel<\/p><\/p>\n\n\n\n<p>If you liked this article, then please subscribe to our <a href=\"http:\/\/youtube.com\/instrumentationtools?sub_confirmation=1\" target=\"_blank\" rel=\"noreferrer noopener\">YouTube Channel<\/a> for PLC and SCADA video tutorials. <\/p>\n\n\n\n<p>You can also follow us on <a href=\"https:\/\/www.facebook.com\/instrumentationtoolss\" target=\"_blank\" rel=\"noreferrer noopener\">Facebook<\/a> and <a href=\"https:\/\/twitter.com\/InstTools\" target=\"_blank\" rel=\"noreferrer noopener\">Twitter<\/a> to receive daily updates.<\/p>\n\n\n\n<p id=\"h-read-next\"><strong>Read Next:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/instrumentationtools.com\/jump-instruction-in-plc-ladder-logic\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to use JUMP Instruction<\/a><\/li><li><a href=\"https:\/\/instrumentationtools.com\/plc-running-hours\/\" target=\"_blank\" rel=\"noreferrer noopener\">Program to Count Running Hours<\/a><\/li><li><a href=\"https:\/\/instrumentationtools.com\/plc-program-water-level-control\/\" target=\"_blank\" rel=\"noreferrer noopener\">Water Level Control Logic<\/a><\/li><li><a href=\"https:\/\/instrumentationtools.com\/tank-level-detection-switches\/\" target=\"_blank\" rel=\"noreferrer noopener\">Tank Level Detection Switches<\/a><\/li><li><a href=\"https:\/\/instrumentationtools.com\/security-of-industrial-automation-systems\/\" target=\"_blank\" rel=\"noreferrer noopener\">Industrial Automation Systems<\/a><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>This article about &#8220;PLC programming to control the level in the tank using three point conductive level switches for motor start &amp; stop logic&#8221;. The level measurement plays a vital role in every industry from small scale sectors to complex oil and gas industries. Different types of sensors available for level measurement like ultrasonic, radar, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":46473,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","footnotes":""},"categories":[6],"tags":[],"class_list":{"0":"post-46472","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-plc"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>PLC Programming using Level Switches - Instrumentation Tools<\/title>\n<meta name=\"description\" content=\"PLC programming to control the level in the tank using three point conductive level switches for motor start &amp; stop logic.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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