{"id":8234558,"date":"2026-10-24T17:26:33","date_gmt":"2026-10-24T17:26:33","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234558"},"modified":"2026-10-24T17:29:28","modified_gmt":"2026-10-24T17:29:28","slug":"industrielle-protokoller","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/da\/guider\/industrielle-protokoller\/","title":{"rendered":"Industrielle protokoller \u2013 PROFINET, EtherNet\/IP, Modbus"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Industrielle protokoller \u2013 PROFINET, EtherNet\/IP, Modbus<\/h1>\n<p class=\"g-lead\">PLC&#8217;en taler PROFINET, energim\u00e5leren Modbus og servodrevet EtherCAT. Her gennemg\u00e5r vi, hvad der adskiller de mest udbredte industrielle protokoller, hvor de bruges, og hvorn\u00e5r du har brug for en gateway for at f\u00e5 dem til at tale sammen.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>PROFINET<\/b> \u2013 protokollen i Siemens-verdenen og den mest udbredte i Europa. Ethernet med realtid til I\/O og drev.<\/li>\n<li><b>EtherNet\/IP<\/b> \u2013 Rockwell (Allen-Bradley) og Omron. Dominerer i Nordamerika.<\/li>\n<li><b>Modbus TCP\/RTU<\/b> \u2013 enkel og \u00e5ben. Findes i n\u00e6sten alt fra elm\u00e5lere til frekvensomformere.<\/li>\n<li><b>EtherCAT og CAN<\/b> \u2013 EtherCAT til hurtig motion control, CANopen og J1939 i maskiner og k\u00f8ret\u00f8jer.<\/li>\n<li><b>OPC UA<\/b> \u2013 til data opad mod SCADA, MES og skyen, ikke til hurtig I\/O.<\/li>\n<li>Taler to enheder forskellige protokoller, er der brug for en <b>gateway<\/b>. Det samme kabel er ikke nok.<\/li>\n<\/ul>\n<\/div>\n<h2>Hvorfor findes der s\u00e5 mange protokoller?<\/h2>\n<p>Fra 1980&#8217;erne erstattede feltbusserne de tykke kabelbundter mellem PLC og sensorer. Hver stor producent drev sin egen standard: Siemens stod bag PROFIBUS, Allen-Bradley bag DeviceNet, og Bosch udviklede CAN til biler. Da Ethernet tog over, blev tankegangen bevaret. PROFINET er i praksis efterf\u00f8lgeren til PROFIBUS, og EtherNet\/IP bygger p\u00e5 det samme applikationslag (CIP) som DeviceNet.<\/p>\n<p>Kablet og stikket kan alts\u00e5 se ens ud, men enhederne taler forskellige sprog. Oftest er det PLC&#8217;en, der afg\u00f8r det: v\u00e6lger kunden Siemens, bliver det PROFINET, v\u00e6lger kunden Rockwell, bliver det EtherNet\/IP. Alt, der ikke taler samme sprog, har brug for en overs\u00e6tter.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-protokoll-f1-da.webp\" alt=\"Automationspyramiden med typiske protokoller: OPC UA og MQTT mod SCADA og skyen, PROFINET, EtherNet\/IP, EtherCAT og Modbus TCP p\u00e5 styringsniveau, IO-Link, Modbus RTU, CANopen og PROFIBUS p\u00e5 feltniveau\" width=\"1520\" height=\"560\" loading=\"lazy\" decoding=\"async\"><figcaption>Forskellige protokoller p\u00e5 forskellige niveauer: realtid t\u00e6ttest p\u00e5 maskinen, data og analyse l\u00e6ngere oppe.<\/figcaption><\/figure>\n<h2>De mest udbredte protokoller i korte tr\u00e6k<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Protokol<\/th>\n<th>Medie<\/th>\n<th>Typisk anvendelse<\/th>\n<th>Udbredt hos<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">PROFINET<\/td>\n<td>Ethernet<\/td>\n<td>I\/O, drev og robotceller. Varianten IRT klarer synkron motion control.<\/td>\n<td>Siemens og mange andre. St\u00f8rst i Europa.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">EtherNet\/IP<\/td>\n<td>Ethernet<\/td>\n<td>I\/O og drev. Bygger p\u00e5 CIP.<\/td>\n<td>Rockwell (Allen-Bradley) og Omron. St\u00f8rst i Nordamerika.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Modbus TCP<\/td>\n<td>Ethernet<\/td>\n<td>Enkel afl\u00e6sning og styring: m\u00e5lere, omformere, HMI og SCADA.<\/td>\n<td>N\u00e6sten alle producenter. \u00c5ben siden 1979.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Modbus RTU<\/td>\n<td>RS-485<\/td>\n<td>Som Modbus TCP, men serielt, op til 247 slaver p\u00e5 \u00e9n bus.<\/td>\n<td>\u00c6ldre og enklere udstyr, energim\u00e5ling.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">EtherCAT<\/td>\n<td>Ethernet<\/td>\n<td>Hurtig motion control med korte cyklustider.<\/td>\n<td>Beckhoff og mange servo- og I\/O-producenter.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">CANopen, J1939<\/td>\n<td>CAN<\/td>\n<td>Indlejrede systemer, mobile maskiner og k\u00f8ret\u00f8jer.<\/td>\n<td>CANopen i maskiner, J1939 i lastbiler og arbejdsmaskiner.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">PROFIBUS<\/td>\n<td>RS-485, MBP<\/td>\n<td>Eksisterende anl\u00e6g (DP) og procesindustri (PA).<\/td>\n<td>Siemens. Erstattes gradvist af PROFINET.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">OPC UA<\/td>\n<td>Ethernet<\/td>\n<td>Data til SCADA, MES og skyen med indbygget sikkerhed.<\/td>\n<td>Leverand\u00f8ruafh\u00e6ngig, IEC 62541.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">IO-Link<\/td>\n<td>Treleder-kabel<\/td>\n<td>Sensorer og aktuatorer med parametrering og diagnose.<\/td>\n<td>Alle store sensorproducenter, IEC 61131-9.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Nogle detaljer er gode at kende. PROFINET-enheder identificeres med et enhedsnavn og beskrives i en GSDML-fil, EtherNet\/IP-enheder i en EDS-fil. Modbus har ingen s\u00e5dan beskrivelse, s\u00e5 du har brug for producentens registerliste. EtherCAT behandler rammerne, mens de passerer hver slave, og kr\u00e6ver derfor s\u00e6rlig hardware i enhederne. IO-Link er ikke et netv\u00e6rk, men en punkt-til-punkt-forbindelse p\u00e5 h\u00f8jst 20 meter mellem sensoren og en IO-Link-master, som til geng\u00e6ld sidder p\u00e5 feltbussen.<\/p>\n<h2>Hvor bruges hvilken protokol?<\/h2>\n<p>Valget styres af branche, region og det udstyr, der allerede findes. Nogle typiske eksempler:<\/p>\n<ul>\n<li><b>Fabrik og maskinbyggere<\/b> \u2013 PROFINET eller EtherNet\/IP afh\u00e6ngigt af kundens PLC. En maskine, der s\u00e6lges i b\u00e5de Europa og USA, har ofte brug for begge. IO-Link bruges mere og mere til sensorerne t\u00e6ttest p\u00e5 processen.<\/li>\n<li><b>K\u00f8ret\u00f8jer og mobile maskiner<\/b> \u2013 CAN dominerer. J1939 i lastbiler, traktorer og entrepren\u00f8rmaskiner, CANopen i lifte, trucks og AGV&#8217;er.<\/li>\n<li><b>Energi og elnet<\/b> \u2013 Modbus i elm\u00e5lere, invertere og batterilagre. I koblingsstationer bruges IEC 61850 og IEC 60870-5-104, som ofte skal overs\u00e6ttes til Modbus eller DNP3.<\/li>\n<li><b>Vand, spildevand og bygninger<\/b> \u2013 Modbus RTU og TCP mod SCADA. OPC UA og MQTT, n\u00e5r data skal videre til overordnede systemer.<\/li>\n<li><b>Jernbane<\/b> \u2013 egne togprotokoller som MVB, WTB og TRDP efter standardserien IEC 61375, med gateways mod Ethernet, seriel og CAN.<\/li>\n<li><b>Medicoteknik og laboratorier<\/b> \u2013 CANopen og serielle interfaces inde i instrumenter og apparater.<\/li>\n<li><b>Halvledere og elektronik<\/b> \u2013 SECS\/GEM mellem produktionsudstyret og fabrikkens overordnede systemer.<\/li>\n<\/ul>\n<h2>Hvorn\u00e5r har du brug for en protokolgateway?<\/h2>\n<p>En gateway er n\u00f8dvendig, n\u00e5r to enheder taler forskellige protokoller, for eksempel n\u00e5r en Modbus-m\u00e5ler skal afl\u00e6ses af en Siemens-PLC. Den er oftest master eller klient p\u00e5 den ene side og slave eller enhed p\u00e5 den anden. Den henter data cyklisk og l\u00e6gger dem i PLC&#8217;ens procesbillede, s\u00e5 programmet ser v\u00e6rdierne som almindelige ind- og udgange.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-protokoll-f2-da.webp\" alt=\"En gateway forbinder en PLC med PROFINET med tre Modbus RTU-enheder p\u00e5 en RS-485-bus: elm\u00e5ler, frekvensomformer og temperaturregulator\" width=\"1520\" height=\"480\" loading=\"lazy\" decoding=\"async\"><figcaption>Gatewayen er PROFINET-enhed over for PLC&#8217;en og Modbus-master over for enhederne p\u00e5 RS-485-bussen.<\/figcaption><\/figure>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Hvis du har brug for at \u2026<\/th>\n<th>\u2026 s\u00e5 v\u00e6lg<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>L\u00e6se Modbus-udstyr fra en PROFINET-PLC<\/td>\n<td>Gateway fra Modbus til PROFINET<\/td>\n<\/tr>\n<tr>\n<td>Forbinde en CANopen- eller J1939-maskine med en Rockwell-PLC<\/td>\n<td>Gateway fra CAN til EtherNet\/IP<\/td>\n<\/tr>\n<tr>\n<td>Tilslutte Modbus- eller Ethernet-enheder til en \u00e6ldre PROFIBUS-PLC<\/td>\n<td>Gateway med PROFIBUS-slave<\/td>\n<\/tr>\n<tr>\n<td>L\u00e6se Modbus RTU fra SCADA over netv\u00e6rket<\/td>\n<td>Modbus-gateway fra RTU til TCP<\/td>\n<\/tr>\n<tr>\n<td>Sende maskindata til MES eller skyen<\/td>\n<td>IIoT-gateway med OPC UA eller MQTT<\/td>\n<\/tr>\n<tr>\n<td>Tilslutte en PC til CAN-bussen til test og service<\/td>\n<td>CAN-interface til USB eller PCIe<\/td>\n<\/tr>\n<tr>\n<td>F\u00e5 RS-232- eller RS-485-enheder p\u00e5 Ethernet uden at skifte protokol<\/td>\n<td>Seriel device server<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"g-short\">\n<p style=\"margin:0\">En gateway passer til I\/O-data og m\u00e5lev\u00e6rdier, men ikke til synkroniseret motion control. Her b\u00f8r drev og PLC tale samme protokol.<\/p>\n<\/div>\n<h2>Almindelige fejl<\/h2>\n<ol class=\"g-pit\">\n<li><b>Samme stik betyder ikke samme protokol.<\/b> PROFINET- og EtherNet\/IP-enheder kan dele kabel og switch, men de udveksler ingen data med hinanden.<\/li>\n<li><b>Registerlisten mangler.<\/b> Modbus sender kun 16-bit-registre. Uden producentens registerliste ved du ikke, hvad der er temperatur, og hvad der er status, eller i hvilken r\u00e6kkef\u00f8lge ordene i en 32-bit-v\u00e6rdi kommer.<\/li>\n<li><b>Multicast fylder nettet.<\/b> EtherNet\/IP sender ofte I\/O-data som multicast. Uden IGMP snooping i switchene sendes trafikken ud p\u00e5 alle porte og kan overbelaste simple enheder.<\/li>\n<li><b>For lille dataomr\u00e5de.<\/b> Kontroll\u00e9r, hvor mange byte gatewayen kan h\u00e5ndtere i hver retning, og hvor hurtigt den opdaterer. Det s\u00e6tter gr\u00e6nsen for, hvor mange enheder du kan tilslutte.<\/li>\n<li><b>Forkert protokol til opgaven.<\/b> OPC UA er fremragende til at sende data opad, men erstatter ikke en realtidsprotokol mod I\/O og drev.<\/li>\n<\/ol>\n<h2>Gateways og interfaces hos SCN<\/h2>\n<p>Vi har protokolgateways fra blandt andre Moxa, HMS Networks (Ixxat), Weintek og Duagon. De d\u00e6kker Modbus, PROFINET, EtherNet\/IP, PROFIBUS, EtherCAT, CANopen, J1939 og OPC UA og ogs\u00e5 togprotokoller som TRDP og MVB. I sortimentet findes ogs\u00e5 CAN-interfaces til PC og serielle konvertere.<\/p>\n<h3>Eksempler fra vores sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/mgate-5103-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/moxa-mgate-5103-main.webp\" alt=\"Moxa MGate 5103 Modbus til PROFINET-gateway\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Moxa<\/span><span class=\"g-pn\">MGate 5103 Modbus til PROFINET-gateway<\/span><span class=\"g-pw\">Forbinder Modbus RTU\/ASCII\/TCP- og EtherNet\/IP-enheder med PROFINET som IO-device, med op til 512 byte ind- og udgangsdata.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/cannet-nt-200-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/CANnet2520NT2520200.jpeg\" alt=\"HMS Networks Ixxat CAN@net NT 200\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">HMS Networks<\/span><span class=\"g-pn\">Ixxat CAN@net NT 200<\/span><span class=\"g-pw\">Gateway og bro mellem CAN og Ethernet med to CAN-kanaler og MQTT til cloud-forbindelser.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/cmt-g01x-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/weintek-cmt-g01x-main.webp\" alt=\"Weintek cMT-G01X IIoT-gateway med OPC UA og MQTT\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Weintek<\/span><span class=\"g-pn\">cMT-G01X IIoT-gateway med OPC UA og MQTT<\/span><span class=\"g-pw\">IIoT-gateway med OPC UA-server og MQTT, der forbinder PLC&#8217;er og maskiner med overordnede systemer.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/industrial-connectivity-da\/protocol-gateways-da\/\">Protokolgateways<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/bridges-gateways-da\/\">Broer og gateways<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/control-systems-da\/gateways-da\/\">Gateways til styresystemer<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/can-interfaces-da\/\">CAN-interfaces<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/industrial-connectivity-da\/serial-converters\/\">Serielle konvertere<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/network-products-2\/ethernet-da\/\">Ethernet-switche<\/a><\/div>\n<div class=\"g-cta\">\n<p>Har du brug for at f\u00e5 to systemer til at tale sammen? Beskriv udstyret og protokollerne for vores ingeni\u00f8rer \u2013 du f\u00e5r svar inden for 24 timer.<\/p>\n<p><a href=\"https:\/\/scn.eu\/da\/kontakt\/\">Sp\u00f8rg en ingeni\u00f8r<\/a><\/div>\n<h2>Ofte stillede sp\u00f8rgsm\u00e5l<\/h2>\n<details>\n<summary>Hvad er forskellen p\u00e5 PROFIBUS og PROFINET?<\/summary>\n<p>PROFIBUS er en seriel feltbus over RS-485 med op til 12 Mbit\/s. PROFINET bygger p\u00e5 Ethernet, giver mere b\u00e5ndbredde og bedre diagnose og er det, der bygges nyt med i dag. Begge forvaltes af samme brancheorganisation, PI.<\/p>\n<\/details>\n<details>\n<summary>Er Modbus TCP og Modbus RTU det samme?<\/summary>\n<p>De bruger samme datamodel og funktionskoder, men forskellig transport. RTU g\u00e5r serielt over RS-485 eller RS-232, TCP over Ethernet. En enkel Modbus-gateway overs\u00e6tter mellem dem.<\/p>\n<\/details>\n<details>\n<summary>Kan PROFINET og EtherNet\/IP findes i samme netv\u00e6rk?<\/summary>\n<p>Ja, de kan dele kabler og switche. Men enhederne udveksler ikke data direkte. Til det kr\u00e6ves en gateway eller en controller, der taler begge protokoller.<\/p>\n<\/details>\n<details>\n<summary>Hvad adskiller EtherCAT fra PROFINET?<\/summary>\n<p>EtherCAT l\u00e6ser og skriver data, mens rammen passerer hver slave, hvilket giver meget korte cyklustider til motion control. PROFINET bruges bredt til I\/O og drev og har varianten IRT til kr\u00e6vende synkron motion control.<\/p>\n<\/details>\n<details>\n<summary>Er OPC UA en feltbusprotokol?<\/summary>\n<p>Nej, OPC UA bruges prim\u00e6rt til at udveksle data mellem maskiner og overordnede systemer som SCADA, MES og skyen. Den har indbygget sikkerhed med certifikater og kryptering. Der findes en variant til feltniveauet, OPC UA FX, men den er endnu ikke lige s\u00e5 udbredt.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>PLC&#8217;en taler PROFINET, energim\u00e5leren Modbus og servodrevet EtherCAT. Her gennemg\u00e5r vi, hvad der adskiller de mest udbredte industrielle protokoller, hvor de bruges, og hvorn\u00e5r du har brug for en gateway for at f\u00e5 dem til at tale sammen.<\/p>\n","protected":false},"author":11,"featured_media":8234377,"template":"","meta":{"_yoast_wpseo_focuskw":"industrielle protokoller","_yoast_wpseo_metadesc":"Industrielle protokoller forklaret: PROFINET, EtherNet\/IP, Modbus, EtherCAT, CANopen og OPC UA \u2013 hvor de bruges, og hvorn\u00e5r du har brug for en gateway.","_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":[879,877,889,12213,881,863],"_scn_guide_sectors":[1011,1080],"_scn_guide_type":"tech","_scn_guide_order":16,"footnotes":""},"class_list":["post-8234558","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>Industrielle protokoller \u2013 PROFINET, EtherNet\/IP, Modbus | SCN<\/title>\n<meta name=\"description\" content=\"Industrielle protokoller forklaret: PROFINET, EtherNet\/IP, Modbus, EtherCAT, CANopen og OPC UA \u2013 hvor de bruges, og hvorn\u00e5r du har brug for en gateway.\" \/>\n<meta name=\"robots\" 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