{"product_id":"beckhoff-el3621-0020-ethercat-terminal-1-channel-analog-input-module","title":"Beckhoff EL3621-0020 EtherCAT Terminal 1-channel Analog Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  Processing high-accuracy current measurements in industrial environments is executed with precision using the \u003cstrong\u003eBeckhoff EL3621-0020\u003c\/strong\u003e EtherCAT Terminal. This single-channel differential analog input module handles signal levels from \u003cstrong\u003e4 to 20 mA\u003c\/strong\u003e with a highly detailed \u003cstrong\u003e24-bit resolution\u003c\/strong\u003e. Each terminal is factory-calibrated, offering an exceptional measuring error margin of less than +\/-0.01 % at 25 degC. Operating directly on the EtherCAT I\/O system, it bridges the gap between field sensors and centralized controllers with reliable E-bus communication.\n\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Resolution Analog Digitization:\u003c\/strong\u003e Utilizes 24-bit digital signal conversion (including sign) for highly detailed process values.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFactory Calibrated:\u003c\/strong\u003e Supplied with an official analog calibration certificate to ensure traceable measurement accuracy.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Low-Pass Filtering:\u003c\/strong\u003e Hardware features an input filter limit frequency of 3 kHz, coupled with configurable conversion times from 1 ms to 400 ms.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDifferential Measurement Architecture:\u003c\/strong\u003e Features high common-mode voltage rejection up to a maximum of 10 V.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact DIN-Rail Housing:\u003c\/strong\u003e Ultra-slim 12 mm form factor minimizes control cabinet footprint.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003eProcess technology loop-monitoring (flow, level, pressure, and temperature transmitters).\u003c\/li\u003e\n  \u003cli\u003eHigh-precision test rigs and calibration benches requiring traceable laboratory-grade field metrics.\u003c\/li\u003e\n  \u003cli\u003eAutomated environmental logging stations and chemical dosing systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d;\"\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eSpecification Value\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eBeckhoff\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eEL3621-0020\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eNumber of Inputs\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e1 (Differential)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInput Signal Current\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e4 to 20 mA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eResolution\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e24-bit (including sign)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInternal Resistance\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003etyp. 85 Ohm + diode voltage\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInput Filter Limit Frequency\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3 kHz\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCommon-Mode Voltage (Ucm)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003emax. 10 V DC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eConversion Time\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e1 to 400 ms (configurable)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMeasurement Error (at 25 degC)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e\u0026lt; ±0.01 % (relative to full scale, 50 Hz filter)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eElectrical Isolation\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e500 V (E-bus \/ signal voltage)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eE-Bus Current Consumption\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003etyp. 190 mA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCrosstalk Attenuation\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e\u0026gt; 60 dB\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eHousing Material\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003ePolycarbonate\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eProtection Rating\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eIP20\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0 to 50 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eStorage Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-25 to 85 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eDimensions (W x H x D)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e12 mm x 100 mm x 68 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eNet Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eapprox. 60 g\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e2.0 kg (including secure export packaging)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eConnections and Interfaces\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d;\"\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eConnection Parameter\u003c\/th\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eSpecification Limits\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eWiring Technology\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eSpring actuation via screwdriver\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eSolid Conductor (e)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.08 to 2.5 mm² (AWG 28 to 14)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eFlexible Conductor (f)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.08 to 2.5 mm² (AWG 28 to 14)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eConductor with Ferrule (a)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.14 to 1.5 mm² (AWG 26 to 16)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eStripping Length\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e8 to 9 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch4\u003eAlternative Models \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  The module provides a factory-calibrated alternative to standard analog inputs where sub-0.01 % accuracy is imperative. Please note that this terminal relies exclusively on the \u003cstrong\u003eE-bus\u003c\/strong\u003e for power. It does not possess feed-through power contacts, so it must be factored into the overall E-bus current budget calculations when replacing standard, lower-consumption modules.\n\u003c\/p\u003e\n\n\u003ch4\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  Due to the 190 mA E-bus current consumption of this terminal, installing multiple high-precision modules side-by-side can quickly deplete the couplers feed capacity. Use an intermediate power supply terminal (such as the EL9410) if the total bus consumption exceeds the coupler rating. Avoid placing high-power switching relays immediately adjacent to this card to prevent EMI-induced drift in the 24-bit AD converter.\n\u003c\/p\u003e\n\n\u003ch4\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  To achieve the factory-calibrated accuracy of less than 0.01 %, use shielded twisted-pair (STP) cabling for the 4 to 20 mA analog signal path. Ensure the cable shield is grounded at the entry point of the control panel. In TwinCAT 3, adjust the conversion filter settings to match the grid frequency (50 Hz or 60 Hz) to optimize common-mode noise rejection.\n\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 1rem; margin-bottom: 1.5rem; color: #9b2c2c;\"\u003e\n  \u003cstrong\u003eCRITICAL WARNING:\u003c\/strong\u003e Hazardous electrical voltage can cause electrical shock and equipment damage. Disconnect and lock out all power sources feeding the terminal segment and associated field devices before inserting, removing, or wiring any EtherCAT terminal modules. Ensure the system is completely de-energized.\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e1\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748;\"\u003e\n      \u003cstrong\u003eDIN-Rail Mounting:\u003c\/strong\u003e Place the module onto the 35 mm DIN rail (conforming to EN 60715) and push down until the locking mechanism clicks securely into place.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e2\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748;\"\u003e\n      \u003cstrong\u003eSide-by-Side Interlocking:\u003c\/strong\u003e Align the side slots with the adjacent EtherCAT Terminal, ensuring the double slot and key connections are fully seated to establish robust E-bus contact.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e3\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748;\"\u003e\n      \u003cstrong\u003eWire Termination:\u003c\/strong\u003e Strip the signal wire outer jacket by 8 to 9 mm. Insert a flathead screwdriver into the spring release slot, insert the wire, and release the tension to secure.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106462818667,"sku":"EL3621-0020","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/el3621-0020-2smi2ho5nve.png?v=1776244497","url":"https:\/\/www.plcprotech.com\/fa\/products\/beckhoff-el3621-0020-ethercat-terminal-1-channel-analog-input-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}