{"id":8234106,"date":"2026-10-24T17:26:17","date_gmt":"2026-10-24T17:26:17","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234106"},"modified":"2026-10-24T17:32:41","modified_gmt":"2026-10-24T17:32:41","slug":"vad-ar-plc","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/sv\/guider\/vad-ar-plc\/","title":{"rendered":"Vad \u00e4r PLC? S\u00e5 fungerar ett styrsystem \u2013 och s\u00e5 v\u00e4ljer du"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Vad \u00e4r PLC? S\u00e5 fungerar ett styrsystem \u2013 och s\u00e5 v\u00e4ljer du<\/h1>\n<p class=\"g-lead\">En PLC \u00e4r en industridator som l\u00e4ser givare, fattar beslut enligt ett program och styr motorer, ventiler och lampor \u2013 om och om igen, n\u00e5gra millisekunder i taget. H\u00e4r f\u00f6rklarar vi hur den fungerar, vilka programspr\u00e5k som finns och hur du v\u00e4ljer system.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>PLC<\/b> \u2013 Programmable Logic Controller, ett programmerbart styrsystem byggt f\u00f6r att styra maskiner och processer dygnet runt.<\/li>\n<li><b>Programcykeln<\/b> \u2013 PLC:n l\u00e4ser alla ing\u00e5ngar, k\u00f6r programmet, skriver alla utg\u00e5ngar och b\u00f6rjar om. En cykel tar ofta n\u00e5gra millisekunder.<\/li>\n<li><b>Programspr\u00e5k<\/b> \u2013 standarden IEC 61131-3 definierar LD, FBD, ST och SFC. Instruktionslistan IL \u00e4r utfasad.<\/li>\n<li><b>Kompakt, modul\u00e4r eller decentraliserad<\/b> \u2013 v\u00e4lj efter antal I\/O, behov av utbyggnad och hur utspridd anl\u00e4ggningen \u00e4r.<\/li>\n<li><b>V\u00e4lj efter helheten<\/b> \u2013 I\/O, kommunikation, programvara och vad dina tekniker redan kan, inte bara priset p\u00e5 CPU:n.<\/li>\n<\/ul>\n<\/div>\n<h2>Vad \u00e4r en PLC?<\/h2>\n<p>PLC st\u00e5r f\u00f6r <i>Programmable Logic Controller<\/i>, p\u00e5 svenska ofta bara styrsystem. De f\u00f6rsta kom i slutet av 1960-talet f\u00f6r att ers\u00e4tta stora rel\u00e4sk\u00e5p i bilindustrin. I st\u00e4llet f\u00f6r att dra om kablar n\u00e4r en maskin skulle \u00e4ndras kunde man \u00e4ndra programmet.<\/p>\n<p>En PLC \u00e4r byggd f\u00f6r industrin: den t\u00e5l vibrationer, elektriska st\u00f6rningar och v\u00e4rme i elsk\u00e5pet, och den k\u00f6r samma program dygnet runt i m\u00e5nga \u00e5r. Ett PLC-system best\u00e5r av:<\/p>\n<ul>\n<li><b>CPU<\/b> \u2013 processorn som k\u00f6r programmet och h\u00e5ller minnet.<\/li>\n<li><b>Ing\u00e5ngar<\/b> \u2013 digitala (24 V DC fr\u00e5n knappar och givare) och analoga (4\u201320 mA, 0\u201310 V, temperatur).<\/li>\n<li><b>Utg\u00e5ngar<\/b> \u2013 transistor- eller rel\u00e4utg\u00e5ngar till ventiler, kontaktorer och lampor, och analoga utg\u00e5ngar till frekvensomriktare och reglerventiler.<\/li>\n<li><b>Kommunikation<\/b> \u2013 f\u00e4ltbussar och industriellt Ethernet till operat\u00f6rspaneler, drivsystem och \u00f6verordnade system.<\/li>\n<li><b>N\u00e4taggregat<\/b> \u2013 oftast 24 V DC.<\/li>\n<\/ul>\n<h3>Var anv\u00e4nds PLC?<\/h3>\n<ul>\n<li><b>Tillverkning<\/b> \u2013 f\u00f6rpackningsmaskiner, transportband, robotceller, pressar och provutrustning.<\/li>\n<li><b>Livsmedel och process<\/b> \u2013 dosering, batchprocesser och reng\u00f6ringssekvenser, ofta programmerade i SFC.<\/li>\n<li><b>Vatten och avlopp<\/b> \u2013 pumpstationer och reningsverk med fj\u00e4rr\u00f6vervakning via SCADA.<\/li>\n<li><b>Energi<\/b> \u2013 vindkraftverk, solcellsparker, batterilager och st\u00e4llverk.<\/li>\n<li><b>J\u00e4rnv\u00e4g och infrastruktur<\/b> \u2013 styrning ombord p\u00e5 t\u00e5g, vid sp\u00e5ret och i tunnlar.<\/li>\n<li><b>Fastigheter<\/b> \u2013 ventilation, v\u00e4rme och belysning i st\u00f6rre byggnader.<\/li>\n<\/ul>\n<h2>Hur fungerar en PLC? Programcykeln<\/h2>\n<p>En PLC arbetar i en fast slinga, programcykeln (scan). F\u00f6rst l\u00e4ser den av alla ing\u00e5ngar och sparar v\u00e4rdena. Sedan k\u00f6rs programmet fr\u00e5n b\u00f6rjan till slut med de sparade v\u00e4rdena. D\u00e4refter skrivs resultaten till utg\u00e5ngarna, och PLC:n sk\u00f6ter kommunikation och diagnos. Sedan b\u00f6rjar allt om.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-plc-f1-sv.webp\" alt=\"PLC:ns programcykel: l\u00e4s ing\u00e5ngar, k\u00f6r programmet, skriv utg\u00e5ngar, kommunikation och diagnos, och sedan om igen\" width=\"1520\" height=\"600\" loading=\"lazy\" decoding=\"async\"><figcaption>PLC:n upprepar samma fyra steg om och om igen.<\/figcaption><\/figure>\n<p>Cykeltiden beror p\u00e5 programmets storlek och processorns hastighet. En watchdog-funktion stoppar PLC:n och s\u00e4tter utg\u00e5ngarna i ett s\u00e4kert l\u00e4ge om cykeln tar f\u00f6r l\u00e5ng tid. H\u00e4ndelser som \u00e4r snabbare \u00e4n cykeln, som pulser fr\u00e5n en pulsgivare, hanteras med avbrott (interrupt) eller snabba r\u00e4knarmoduler.<\/p>\n<p>F\u00f6r kommunikation anv\u00e4nds f\u00e4ltbussar och industriellt Ethernet som PROFINET, EtherNet\/IP, Modbus TCP, EtherCAT och PROFIBUS. Mot IT-system och moln anv\u00e4nds allt oftare OPC UA och MQTT.<\/p>\n<h2>Programspr\u00e5k enligt IEC 61131-3<\/h2>\n<p>Standarden IEC 61131-3 beskriver gemensamma programspr\u00e5k f\u00f6r PLC, s\u00e5 att en tekniker kan k\u00e4nna igen sig mellan olika fabrikat. De flesta projekt blandar flera spr\u00e5k.<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Spr\u00e5k<\/th>\n<th>Typ<\/th>\n<th>Passar f\u00f6r<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">LD \u2013 Ladder Diagram<\/td>\n<td>Grafiskt, liknar ett rel\u00e4schema<\/td>\n<td>Logik och f\u00f6rreglingar. L\u00e4tt f\u00f6r elektriker att fels\u00f6ka.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">FBD \u2013 Function Block Diagram<\/td>\n<td>Grafiskt, block som kopplas ihop<\/td>\n<td>Reglering och analoga signaler, till exempel PID.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">ST \u2013 Structured Text<\/td>\n<td>Textbaserat, likt Pascal<\/td>\n<td>Ber\u00e4kningar, loopar och datahantering.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">SFC \u2013 Sequential Function Chart<\/td>\n<td>Grafiskt, steg och \u00f6verg\u00e5ngar<\/td>\n<td>Sekvenser som maskincykler och batchprocesser.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">IL \u2013 Instruction List<\/td>\n<td>Textbaserat, likt assembler<\/td>\n<td>Utfasat i tredje utg\u00e5van (2013) och borttaget i fj\u00e4rde (2025). Anv\u00e4nds i \u00e4ldre program.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"g-short\">\n<p style=\"margin:0\">I Siemens STEP 7 och TIA Portal heter motsvarigheterna LAD, FBD, SCL och GRAPH. STL motsvarar ungef\u00e4r IL.<\/p>\n<\/div>\n<h2>Kompakt PLC, modul\u00e4r PLC eller decentraliserad I\/O?<\/h2>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-plc-f2-sv.webp\" alt=\"Tre s\u00e4tt att bygga ett PLC-system: kompakt enhet, modul\u00e4rt system p\u00e5 skena och decentraliserad I\/O via n\u00e4tverk\" width=\"1520\" height=\"460\" loading=\"lazy\" decoding=\"async\"><figcaption>Tre s\u00e4tt att bygga ett PLC-system.<\/figcaption><\/figure>\n<ul>\n<li><b>Kompakt PLC<\/b> \u2013 CPU, ing\u00e5ngar och utg\u00e5ngar i en enhet, ofta utbyggbar med n\u00e5gra moduler. Passar mindre maskiner, pumpstationer och fastighetsautomation.<\/li>\n<li><b>Modul\u00e4r PLC<\/b> \u2013 CPU, n\u00e4taggregat och I\/O-moduler p\u00e5 DIN-skena eller bakplan. Du v\u00e4ljer exakt de moduler du beh\u00f6ver och kan bygga ut. Passar st\u00f6rre maskiner och processer.<\/li>\n<li><b>Decentraliserad I\/O<\/b> \u2013 I\/O-stationer ute vid maskinen, kopplade till CPU:n via f\u00e4ltbuss eller Ethernet. Sparar mycket kabel och g\u00f6r det enklare att bygga maskiner i moduler.<\/li>\n<\/ul>\n<h2>PLC, PC-baserad styrning eller mikrokontroller?<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>L\u00f6sning<\/th>\n<th>Styrka<\/th>\n<th>Passar n\u00e4r<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">PLC<\/td>\n<td>Robust, f\u00f6ruts\u00e4gbar cykeltid, enkel fels\u00f6kning och l\u00e5ng livsl\u00e4ngd<\/td>\n<td>Maskiner och processer som ska g\u00e5 i m\u00e5nga \u00e5r och underh\u00e5llas av tekniker<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">PC-baserad styrning<\/td>\n<td>Mycket ber\u00e4kningskraft. Styrning, HMI, bildbehandling och databas i samma dator<\/td>\n<td>Avancerad r\u00f6relsestyrning och datatunga till\u00e4mpningar<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Mikrokontroller<\/td>\n<td>L\u00e5gt pris per enhet i stora serier<\/td>\n<td>Produkter i stora volymer d\u00e4r du sj\u00e4lv konstruerar och certifierar elektroniken<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>En <b>s\u00e4kerhets-PLC<\/b> anv\u00e4nds f\u00f6r n\u00f6dstopp, skyddsgrindar och ljusrid\u00e5er. Den har dubbla kanaler och sj\u00e4lvdiagnostik och \u00e4r certifierad f\u00f6r till exempel SIL 3 enligt IEC 61508 eller PL e enligt EN ISO 13849-1. S\u00e4kra signaler kan g\u00e5 i samma n\u00e4tverk som \u00f6vriga data med protokoll som PROFIsafe och FSoE.<\/p>\n<h2>S\u00e5 v\u00e4ljer du PLC \u2013 fem fallgropar<\/h2>\n<ol class=\"g-pit\">\n<li><b>F\u00f6r sn\u00e5lt med I\/O.<\/b> Maskiner v\u00e4xer. Planera f\u00f6r 10\u201320 procent reserv och plats f\u00f6r fler moduler.<\/li>\n<li><b>Kommunikationen gl\u00f6ms bort.<\/b> Kontrollera vilka protokoll frekvensomriktare, paneler och andra maskiner anv\u00e4nder innan du v\u00e4ljer CPU.<\/li>\n<li><b>Programvaran r\u00e4knas inte in.<\/b> Licenser och utbildning kan kosta mer \u00e4n h\u00e5rdvaran. Kontrollera vad som ing\u00e5r och vad uppgraderingar kostar.<\/li>\n<li><b>Man bortser fr\u00e5n vad teknikerna kan.<\/b> V\u00e4lj en milj\u00f6 som de som ska fels\u00f6ka klockan tre p\u00e5 natten k\u00e4nner till. Det kan betyda ett system som programmeras med samma verktyg som befintliga anl\u00e4ggningar.<\/li>\n<li><b>Milj\u00f6n underskattas.<\/b> Vanliga PLC-system \u00e4r ofta specificerade f\u00f6r 0\u201360 \u00b0C. T\u00e5g, utomhussk\u00e5p och mobila till\u00e4mpningar kr\u00e4ver ett bredare temperaturomr\u00e5de, och t\u00e5g \u00e4ven EN 50155.<\/li>\n<\/ol>\n<h2>PLC-system hos SCN<\/h2>\n<p>Vi har PLC-system fr\u00e5n Yaskawa (tidigare VIPA) i familjerna Micro PLC, SLIO och 300S+. De kan programmeras i Siemens SIMATIC Manager (STEP 7) eller TIA Portal, och SLIO och Micro PLC \u00e4ven i Yaskawas Speed 7 Studio. Dessutom finns CODESYS-styrningar fr\u00e5n Weintek och programmerbara styrenheter och fj\u00e4rr-I\/O fr\u00e5n Moxa.<\/p>\n<h3>Exempel ur v\u00e5rt sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/m13-ccf0000-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/M13-CCF0000.jpg\" alt=\"Yaskawa M13-CCF0001\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Yaskawa<\/span><span class=\"g-pn\">M13-CCF0001<\/span><span class=\"g-pw\">Kompakt PLC med 16 DI, 12 DO, 2 AI och 2 PWM inbyggt. Programmeras i Speed 7 Studio, SIMATIC Manager eller TIA Portal.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/cmt-ctrl01\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/cmt-ctrl01.png\" alt=\"Weintek cMT-CTRL01\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Weintek<\/span><span class=\"g-pn\">cMT-CTRL01<\/span><span class=\"g-pw\">CODESYS-PLC och IIoT-gateway i ett \u2013 skickar data med MQTT eller OPC UA.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/iologik-e1200-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/moxa-iologik-e1200-main.webp\" alt=\"Moxa ioLogik E1200 fj\u00e4rr-I\/O-moduler f\u00f6r Ethernet\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Moxa<\/span><span class=\"g-pn\">ioLogik E1200 fj\u00e4rr-I\/O-moduler f\u00f6r Ethernet<\/span><span class=\"g-pw\">Ethernet-fj\u00e4rr-I\/O med Modbus TCP och EtherNet\/IP och tv\u00e5 portar f\u00f6r kedjekoppling.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/control-systems-sv\/plc-systems-sv\/\">PLC-system<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/control-systems-sv\/plc-systems-sv\/micro-plc-sv\/\">Micro PLC<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/control-systems-sv\/plc-systems-sv\/slio-sv\/\">SLIO<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/control-systems-sv\/plc-systems-sv\/300s-sv\/\">300S+<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/control-systems-sv\/gateways-sv\/\">Gateways<\/a><\/div>\n<div class=\"g-cta\">\n<p>Ska du bygga nytt eller byta ut ett \u00e4ldre styrsystem? Fr\u00e5ga en av v\u00e5ra ingenj\u00f6rer \u2013 du f\u00e5r svar inom 24 timmar.<\/p>\n<p><a href=\"https:\/\/scn.eu\/sv\/kontakt\/\">Fr\u00e5ga en ingenj\u00f6r<\/a><\/div>\n<h2>Vanliga fr\u00e5gor<\/h2>\n<details>\n<summary>Vad st\u00e5r PLC f\u00f6r?<\/summary>\n<p>Programmable Logic Controller, ett programmerbart styrsystem. P\u00e5 svenska s\u00e4ger man ofta styrsystem eller bara PLC.<\/p>\n<\/details>\n<details>\n<summary>Vilket PLC-spr\u00e5k \u00e4r vanligast?<\/summary>\n<p>Ladder (LD) \u00e4r fortfarande vanligt f\u00f6r logik, medan Structured Text (ST) anv\u00e4nds alltmer f\u00f6r ber\u00e4kningar och st\u00f6rre program. De flesta projekt blandar spr\u00e5k.<\/p>\n<\/details>\n<details>\n<summary>Vad \u00e4r skillnaden mellan PLC och DCS?<\/summary>\n<p>En DCS (Distributed Control System) \u00e4r ett styrsystem f\u00f6r stora processanl\u00e4ggningar, d\u00e4r styrning, operat\u00f6rsbilder och databaser \u00e4r integrerade fr\u00e5n b\u00f6rjan. En PLC \u00e4r mer frist\u00e5ende och vanligast i maskiner och mindre anl\u00e4ggningar.<\/p>\n<\/details>\n<details>\n<summary>Kan jag anv\u00e4nda en annan PLC \u00e4n Siemens i en Siemens-milj\u00f6?<\/summary>\n<p>Ja. Det finns S7-kompatibla PLC-system, till exempel fr\u00e5n Yaskawa, som programmeras i SIMATIC Manager eller TIA Portal. Kontrollera vilka funktioner och moduler som st\u00f6ds.<\/p>\n<\/details>\n<details>\n<summary>Vad \u00e4r en soft-PLC?<\/summary>\n<p>En PLC som k\u00f6rs som programvara p\u00e5 en industridator i st\u00e4llet f\u00f6r p\u00e5 en egen PLC-h\u00e5rdvara. Den ger mer ber\u00e4kningskraft, men kr\u00e4ver en dator som \u00e4r byggd f\u00f6r industrimilj\u00f6.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>En PLC \u00e4r en industridator som l\u00e4ser givare, fattar beslut enligt ett program och styr motorer, ventiler och lampor \u2013 om och om igen, n\u00e5gra millisekunder i taget. H\u00e4r f\u00f6rklarar vi hur den fungerar, vilka programspr\u00e5k som finns och hur du v\u00e4ljer system.<\/p>\n","protected":false},"author":11,"featured_media":8234063,"template":"","meta":{"_yoast_wpseo_focuskw":"vad \u00e4r plc","_yoast_wpseo_metadesc":"Vad \u00e4r PLC? L\u00e4r dig hur ett styrsystem fungerar, programcykeln, spr\u00e5ken i IEC 61131-3 och hur du v\u00e4ljer mellan kompakt, modul\u00e4r och decentraliserad PLC.","_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_scn_guide_cats":[670,882,896,884],"_scn_guide_sectors":[1011],"_scn_guide_type":"tech","_scn_guide_order":14,"footnotes":""},"class_list":["post-8234106","scn_guide","type-scn_guide","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vad \u00e4r PLC? S\u00e5 fungerar ett styrsystem \u2013 och s\u00e5 v\u00e4ljer du | SCN<\/title>\n<meta name=\"description\" content=\"Vad \u00e4r PLC? 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