[ { "uid": "link_contact", "linkName": "Contact", "url": "/in/contact#wago-support-contact-anchor", "target": "_self", "classAttributes": "phone" } ]

[{"term":"Libraries_BA","id":0,"type":"QUICKLINKS"},{"term":"Instructions","id":1,"type":"QUICKLINKS"},{"term":"WAGO-I/O-PRO","id":2,"type":"QUICKLINKS"},{"term":"Building","id":3,"type":"QUICKLINKS"},{"term":"221","id":4,"type":"QUICKLINKS"}] [ { "uid": "item_0000003I", "link": { "linkName": "PRODUCTS", "url": "/in/products", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_00001I1Z", "link": { "linkName": "Connection Technology", "url": "/in/electrical-interconnections", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_00001I20", "link": { "linkName": "Rail-Mount Terminal Blocks", "url": "/in/c/rail-mount-terminal-blocks", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I22", "link": { "linkName": "Installation Terminal Blocks and Connectors", "url": "/in/c/installation-terminal-blocks-and-connectors", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I24", "link": { "linkName": "Pluggable Connectors", "url": "/in/c/pluggable-connectors", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I26", "link": { "linkName": "PCB Terminal Blocks and Connectors", "url": "/in/c/pcb-terminal-blocks-and-pluggable-connectors", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I2A", "link": { "linkName": "Field-Wiring Terminal Blocks", "url": "/in/c/field-wiring-terminal-blocks", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001JWL", "link": { "linkName": "Feedthrough Components", "url": "/in/c/feedthrough-components", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_in_0000CZQK", "link": { "linkName": "Interface Electronic", "url": "/in/interface-electronic", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_in_0000CZQO", "link": { "linkName": "Power Supplies", "url": "/in/c/power-supply-modules", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000CZQN", "link": { "linkName": "Relay and Optocoupler Modules", "url": "/in/c/relay-and-optocoupler-modules", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000CZQQ", "link": { "linkName": "Interface Modules", "url": "/in/c/interface-modules-and-system-wiring", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000CZQM", "link": { "linkName": "Signal Conditioners and Isolation Amplifiers", "url": "/in/c/signal-conditioners-and-isolation-amplifiers", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000CZQP", "link": { "linkName": "Current Transformers and Voltage Taps", "url": "/in/c/energy-measurement-technology", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000CZQS", "link": { "linkName": "Overvoltage Protection", "url": "/in/c/overvoltage-protection", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000CZQT", "link": { "linkName": "System Wiring", "url": "/in/c/interface-modules-and-system-wiring", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_00001I2C", "link": { "linkName": "Automation Technology", "url": "/in/automation-technology", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_in_0000FHAB", "link": { "linkName": "Edge Devices", "url": "/in/search?text=Edge%20computer&f=%3Afacet_product_Produkttyp_7845%3AEdge%20Devices%3AresultType%3Aall", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I2E", "link": { "linkName": "PLCs/ Controllers", "url": "/in/c/plcs-controllers", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I2J", "link": { "linkName": "I/O Systems", "url": "/in/c/io-systems", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I2L", "link": { "linkName": "Industrial Network Switches", "url": "/in/c/industrial-switches", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I2S", "link": { "linkName": "HMI Touch Panels", "url": "/in/c/touch-panels", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I2N", "link": { "linkName": "Sensor/ Actuator Boxes", "url": "/in/c/sensor-actuator-boxes", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I2P", "link": { "linkName": "Software", "url": "/in/c/software", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H5DG", "link": { "linkName": "Cloud", "url": "/in/open-automation/industrial-iot", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_00001I3D", "link": { "linkName": "General", "url": "", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_00001I3J", "link": { "linkName": "Marking", "url": "/in/c/marking", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001I3H", "link": { "linkName": "Tools", "url": "/in/c/tools", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00001JX1", "link": { "linkName": "Accessories", "url": "/in/c/accessories", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00002T2X", "link": { "linkName": "Online Product Configuration Tool", "url": "https://configurator.wago.com/", "target": "_blank", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_in_0000F2I5", "link": { "linkName": "Cross Reference Tool", "url": "/in/crossreferences", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } ] } , { "uid": "item_0000003J", "link": { "linkName": "SOLUTIONS", "url": "/in/solutions", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_00002A7F", "link": { "linkName": "Topics", "url": "", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_00002A82", "link": { "linkName": "Energy Management", "url": "/in/energy-management", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_00002A84", "link": { "linkName": "Lighting Management", "url": "/in/building-technology/lighting/lighting-management", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_in_0000FYUG", "link": { "linkName": "Plant Digitization", "url": "/in/digitization", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H5BV", "link": { "linkName": "Custom Control Cabinet", "url": "/in/control-cabinet-manufacturing", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H5BX", "link": { "linkName": "Smart Building", "url": "/in/building-technology/smart-building", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } ] } , { "uid": "item_in_0000H5BZ", "link": { "linkName": "INDUSTRIES", "url": "/in/solutions", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_in_0000H5C6", "link": { "linkName": "Industries", "url": "", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_in_0000H4KH", "link": { "linkName": "Automotive Industry", "url": "/in/automotive-industry", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4KI", "link": { "linkName": "Building Technology", "url": "/in/building-technology", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4KJ", "link": { "linkName": "Lighting Technology", "url": "/in/lighting-technology", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4KK", "link": { "linkName": "Process Industry", "url": "/in/plant-digitization/process-engineering", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4KL", "link": { "linkName": "Railway Systems", "url": "/in/railway-systems", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_in_0000H4KQ", "link": { "linkName": "", "url": "", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_in_0000H4KV", "link": { "linkName": "Power and Energy", "url": "/in/power-engineering", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4KS", "link": { "linkName": "Machine Building", "url": "/in/mechanical-engineering", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4KT", "link": { "linkName": "Marine and Offshore", "url": "/in/marine-offshore", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4KU", "link": { "linkName": "Elevators and Escalators", "url": "/in/elevators-and-escalators", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } ] } , { "uid": "item_00000H6J", "link": { "linkName": "COMPANY", "url": "/in/company", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_00009UCR", "link": { "linkName": "History of WAGO", "url": "/in/companyhistory", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00007JNK", "link": { "linkName": "Our Responsibility", "url": "", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_00007JNN", "link": { "linkName": "Community", "url": "", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00007JNP", "link": { "linkName": "Supply Chain", "url": "", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_in_0000GJ02", "link": { "linkName": "Our Motivation", "url": "/in/motivation", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } , { "uid": "item_in_0000H5D7", "link": { "linkName": "Our Approach", "url": "/in/approach", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } , { "uid": "item_in_0000H5D9", "link": { "linkName": "Sustainability at WAGO", "url": "/in/sustainability", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00002Z9X", "link": { "linkName": "Data and Facts", "url": "/in/data-facts", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ ] } , { "uid": "item_000083VB", "link": { "linkName": "Management", "url": "/in/management", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00002ZA3", "link": { "linkName": "WAGO Group", "url": "/in/wago-group", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_00007I6V", "link": { "linkName": "WAGO India", "url": "/in/wago_india", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00002ZAL", "link": { "linkName": "Minden Headquarters", "url": "", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00002ZAN", "link": { "linkName": "WAGO Germany", "url": "/in/germany", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_00002ZAR", "link": { "linkName": "WAGO International", "url": "/in/search?f=%3Afacet_pos_type%3ANationalAgency%3Afacet_pos_type%3AWagoCorporation%3Afacet_pos_type%3AProductionSite%3AresultType%3Acontact&sort=relevance&pageSize=20", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_in_0000D1WZ", "link": { "linkName": "Production Sites", "url": "/in/s/productionsite", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H5D5", "link": { "linkName": "Member of WAGO Group", "url": "/in/s/memberofwagogroup", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H5D6", "link": { "linkName": "Partner of WAGO Group", "url": "/in/pos/partnerofwagogroup/elrest_automationssysteme_gmbH", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_in_0000HSH6", "link": { "linkName": "Careers", "url": "/in/jobs-and-careers", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } ] } , { "uid": "item_00000Y94", "link": { "linkName": "CUSTOMER SERVICE", "url": "/in/contact", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_00007UOQ", "link": { "linkName": "Find Nearest Distributor", "url": "/in/s/wholesaler", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } , { "uid": "item_in_0000LBVE", "link": { "linkName": "Returns and Complaints", "url": "/in/returns-complaints", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00009UDH", "link": { "linkName": "System Integrators", "url": "/in/s/solutionprovider", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_in_0000DRE0", "link": { "linkName": "For Automotive Industry", "url": "/in/s/solutionprovider?sort=contact-name&with=automotive", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000DRE2", "link": { "linkName": "For Lighting Technology", "url": "/in/s/solutionprovider?sort=contact-name&with=lighting", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000DRE4", "link": { "linkName": "For Manufacturing Industry", "url": "/in/s/solutionprovider?sort=contact-name&with=Manufacturing", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000DRE6", "link": { "linkName": "For Marine and Offshore", "url": "/in/s/solutionprovider?sort=contact-name&with=Marine", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000DRE8", "link": { "linkName": "For Power and Energy", "url": "/in/s/solutionprovider?sort=contact-name&with=power%20and%20energy", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000DREA", "link": { "linkName": "For Process Industry", "url": "/in/s/solutionprovider?sort=contact-name&with=process", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_in_0000H4KW", "link": { "linkName": "General", "url": "", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_in_0000H4KX", "link": { "linkName": "Product Finder", "url": "/in/crossreferences", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } , { "uid": "item_in_0000H4L0", "link": { "linkName": "Online Trainings", "url": "https://www.wago.com/global/online-trainings", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } ] } , { "uid": "item_000006E5", "link": { "linkName": "DOWNLOADS", "url": "/in/downloads", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ { "uid": "item_00002CD1", "link": { "linkName": "Documentation", "url": "/in/search?q=*%3Arelevance%3AresultType%3Adownload%3Afacet_download_docCategory1%3ADL_13", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00002CD9", "link": { "linkName": "Software", "url": "search?q=*%3Arelevance%3AresultType%3Adownload%3Afacet_download_docCategory1%3ADL_58%3Afacet_download_docCategory1%3ADL_59%3Afacet_download_docCategory1%3ADL_57%3Afacet_download_docCategory1%3ADL_56%3Afacet_download_docCategory1%3ADL_8&amp;ststate=eyJwcm9kdWN0IjoiL3NlYXJjaD9xXHUwMDNkKiUzQXJlbGV2YW5jZSUzQXJlc3VsdFR5cGUlM0Fwcm9kdWN0XHUwMDI2c2l0ZU5hbWVcdTAwM2RXQUdPLURFLVdlYnNpdGUiLCJkb3dubG9hZCI6Ii9zZWFyY2g%2FcVx1MDAzZColM0FyZWxldmFuY2UlM0FyZXN1bHRUeXBlJTNBZG93bmxvYWQlM0Fkb2NDYXRlZ29yeTElM0FETF81OCUzQWRvY0NhdGVnb3J5MSUzQURMXzU5JTNBZG9jQ2F0ZWdvcnkxJTNBRExfNTclM0Fkb2NDYXRlZ29yeTElM0FETF81NiJ9", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00002CD3", "link": { "linkName": "Application Notes", "url": "/in/search?q=*%3Arelevance%3AresultType%3Adownload%3Afacet_download_docCategory1%3ADL_3", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00002CD7", "link": { "linkName": "smartDATA-Downloads", "url": "https://www.wago.com/global/search?q=*%3Arelevance%3AresultType%3Adownload%3Afacet_download_docCategory1%3ADL_47&amp;ststate=eyJwcm9kdWN0IjoiL3NlYXJjaD9xXHUwMDNkKiUzQXJlbGV2YW5jZSUzQXJlc3VsdFR5cGUlM0Fwcm9kdWN0XHUwMDI2c2l0ZU5hbWVcdTAwM2RXQUdPLURFLVdlYnNpdGUiLCJkb3dubG9hZCI6Ii9zZWFyY2g%2FcVx1MDAzZColM0FyZWxldmFuY2UlM0FyZXN1bHRUeXBlJTNBZG93bmxvYWQifQ%3D%3D", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ ] } , { "uid": "item_00002CDB", "link": { "linkName": "Certificates and Approvals", "url": "/in/certificates", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ { "uid": "item_00002CDJ", "link": { "linkName": "Corporate Certificates", "url": "/in/corporate-certificates", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_00002CDL", "link": { "linkName": "Product-Specific Certificates", "url": "https://www.wago.com/global/search?q=*%3Arelevance%3AresultType%3Adownload%3Afacet_download_docCategory2%3ADL_36&amp;ststate=eyJwcm9kdWN0IjoiL3NlYXJjaD9xXHUwMDNkKiUzQXJlbGV2YW5jZSUzQXJlc3VsdFR5cGUlM0Fwcm9kdWN0XHUwMDI2c2l0ZU5hbWVcdTAwM2RXQUdPLURFLVdlYnNpdGUiLCJkb3dubG9hZCI6Ii9zZWFyY2g%2FcVx1MDAzZColM0FyZWxldmFuY2UlM0FyZXN1bHRUeXBlJTNBZG93bmxvYWQifQ%3D%3D", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_00002CDP", "link": { "linkName": "Guidelines and Regulations", "url": "/in/guidelines", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_00003PKN", "link": { "linkName": "Laboratory Tests", "url": "/in/laboratory-tests", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" } } , { "uid": "item_0000AF32", "link": { "linkName": "Environmental Product Compliance", "url": "https://smartdata.wago.com/articledata/svhc", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" } } ] } , { "uid": "item_00002CDT", "link": { "linkName": "Catalogs", "url": "/in/catalogs-price-lists", "target": "_self", "renderWithEmptyTarget": true, "classAttributes": "" }, "children": [ ] } ] } , { "uid": "item_in_0000FR8H", "link": { "linkName": "Blogs", "url": "/in/blog", "target": "_self", "renderWithEmptyTarget": false, "classAttributes": "" }, "children": [ ] } ]

{ "@context" : "http://schema.org/", "@type" : "Product", "name" : "2-channel analog output; 4 … 20 mA", "description" : "This analog output module generates standard 4–20 mA signals.The output signal is electrically isolated and transmitted with a resolution of 12 bits.Power is derived from the field side.", "mpn" : "750-554", "sku" : "750-554", "brand" : { "@type":"Brand", "name":"WAGO" }, "manufacturer" : { "@type":"Organization", "name":"WAGO Kontakttechnik GmbH & Co. KG" }, "image" : "https://www.wago.com/medias/200-0200000d0002c2be000100b6-DE.jpg?context=bWFzdGVyfGltYWdlc3wyNzA2fGltYWdlL2pwZWd8YUdGa0wyZzJZeTh4TkRZNE9UVTVOekEyTXpFNU9DOHlNREJmTURJd01EQXdNR1F3TURBeVl6SmlaVEF3TURFd01HSTJYMFJGTG1wd1p3fDMwNjU0MTBkNmY1M2I1YWQ3ZmNiMDJjMmU2ZmQzZjcxNmI5Yjg2Y2NmNWM4MTNiNGRiNDRiNGNhN2Q4NTRlNWQ", "gtin13" : "4045454393663", "category" : "I/O Systems", "url" : "https://www.wago.com/in/io-systems/2-channel-analog-output/p/750-554" }

[ { "id": "details", "label":"Details", "priority": 100 }, { "id": "downloads", "label":"Downloads", "priority": 90 } ]

WAGO I/O System 750/753 Item no. 750-554

2-channel analog output; 4 … 20 mA