{"product_id":"omron-cj1w-etn21-cj-series-ethernet-unit","title":"Omron CJ1W-ETN21 CJ Series Ethernet Unit","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eFacilitating seamless network integration, the \u003cstrong\u003eOmron CJ1W-ETN21\u003c\/strong\u003e Ethernet communications module links CJ-series controllers to higher-level enterprise systems and peer control networks. This CPU Bus Unit mounts directly onto a CJ-series CPU Rack or Expansion Rack, providing dedicated 100Base-TX and 10Base-T physical interface ports. Engineered for stable industrial data exchange, the module supports standard TCP\/IP and UDP\/IP protocols, allowing multiple simultaneous socket connections and reliable PLC-to-PLC data link synchronization.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eFeatures\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 20px;\"\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eClassified as a standard CJ-series CPU Bus Unit for seamless backplane integration.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eSupports auto-negotiating 100Base-TX and 10Base-T Ethernet connections.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eUtilizes standard star network topology for structured cabling layouts.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eAllows transmission distances up to 100 meters between the node and network hub without signal degradation.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eLow energy footprint, drawing a maximum of 370 mA from the internal 5 V DC rack power supply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 20px;\"\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eSCADA, HMI, and plant-level supervisory control system interfacing.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eDistributed peer-to-peer PLC data exchange across manufacturing zones.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eRemote programming, online diagnostics, and program uploads\/downloads via CX-Programmer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\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; text-align: left;\"\u003e\n        \u003cth style=\"padding: 8px; font-weight: bold;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"padding: 8px; font-weight: bold;\"\u003eSpecification\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;\"\u003eOmron\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;\"\u003eCJ1W-ETN21\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eUnit Classification\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eCJ-series CPU Bus Unit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003ePhysical Layer \/ Port Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e100Base-TX (Backward compatible with 10Base-T)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModulation Method\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eBaseband\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eTransmission Topology\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eStar form\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMaximum Cable Distance\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e100 meters (distance between hub and node)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMounting Location\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eCPU Rack or Expansion Rack\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCurrent Consumption\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e370 mA maximum at 5 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;\"\u003eNet Unit Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.10 kg\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;\"\u003e1.5 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eAlternative Models \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe \u003cstrong\u003eCJ1W-ETN21\u003c\/strong\u003e replaces older-generation CJ1W-ETN11 models. When replacing an ETN11 module, verify the allocation of DM area words and system settings in the CPU, as additional routing and socket configuration blocks are enabled in the ETN21 firmware structure.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eTo ensure stable communication under maximum industrial traffic load, the internal 5 V DC power draw must be accounted for during total rack power budget calculations. Ensure that the total 5 V DC current drawn by all modules connected to the CPU or Expansion Rack does not exceed the rated output capacity of the installed power supply module.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eUse high-quality double-shielded twisted pair (STP) Category 5 (or higher) cables for connection to the network switch. Ground the cable shield properly at the network switch side. Avoid running Ethernet communication cables parallel to high-voltage power lines or variable frequency drive (VFD) output cables to minimize high-frequency electromagnetic interference.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 15px; margin-bottom: 1.5rem;\"\u003e\n  \u003cstrong style=\"color: #9b2c2c; display: block; margin-bottom: 5px;\"\u003eCRITICAL WARNING\u003c\/strong\u003e\n  \u003cp style=\"color: #9b2c2c; margin: 0;\"\u003ePrior to physically inserting or removing this module from the backplane, completely shut off the power supply to the entire PLC rack. Hot-swapping the CJ1W-ETN21 can lead to permanent damage to the CPU backplane interface, corrupt volatile memory registers, or trigger immediate system-wide CPU bus errors.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 15px; margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 28px; height: 28px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; font-weight: bold; margin-right: 12px; margin-top: 2px;\"\u003e1\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 4px;\"\u003eLocate an available CPU Bus Unit slot on either the CPU Rack or an Expansion Rack. Remove the dust covers if applicable.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 28px; height: 28px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; font-weight: bold; margin-right: 12px; margin-top: 2px;\"\u003e2\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 4px;\"\u003eAlign the upper and lower guides of the module with the backplane slots. Carefully press the unit straight back until the connectors engage fully and the lock levers click into place.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 28px; height: 28px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; font-weight: bold; margin-right: 12px; margin-top: 2px;\"\u003e3\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 4px;\"\u003eSet the Unit Number rotary switch on the front panel of the module using a small flathead screwdriver. Ensure this unit number is unique on the bus and matches your I\/O table configurations.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 28px; height: 28px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; font-weight: bold; margin-right: 12px; margin-top: 2px;\"\u003e4\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 4px;\"\u003eInsert the RJ45 industrial Ethernet connector into the front interface port until you hear a solid click. Secure the cable to a wire tray or cabinet bracket to avoid physical strain on the port.\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Omron","offers":[{"title":"Default Title","offer_id":53077904621931,"sku":"CJ1W-ETN21","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/cj1w-etn21-ukwsiik2q3n.png?v=1775733509","url":"https:\/\/www.plcprotech.com\/products\/omron-cj1w-etn21-cj-series-ethernet-unit","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}