{"product_id":"mitsubishi-electric-lj71e71-100-cm-melsec-l-series-ethernet-interface-module","title":"Mitsubishi Electric LJ71E71-100-CM MELSEC L Series Ethernet Interface Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eProviding high-speed Ethernet connectivity directly to MELSEC L Series architectures, the Mitsubishi Electric LJ71E71-100-CM manages robust plant-level data transmission and programming tasks. This module enables fast, reliable industrial network communications by acting as a gateway between the processor unit and supervisor-level SCADA systems, HMIs, or other controllers. Featuring dual-rate physical media support for \u003cstrong\u003e100BASE-TX\u003c\/strong\u003e and \u003cstrong\u003e10BASE-T\u003c\/strong\u003e networks, the module seamlessly processes intensive data payloads while maintaining low internal bus current draw. Built-in system functions allow for easy remote maintenance, diagnostic monitoring, and configuration changes directly through the GX Works2 programming software platform.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003e\n\u003cstrong\u003eMulti-Protocol Support:\u003c\/strong\u003e Compatible with MELSOFT connection, SLMP (MC protocol), Socket communication, and pre-defined developer protocols.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003e\n\u003cstrong\u003eFlexible Network Access:\u003c\/strong\u003e Built-in Web functions and E-mail transmission utilities allow for direct remote troubleshooting and diagnostics.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003e\n\u003cstrong\u003eAuto-Negotiation:\u003c\/strong\u003e Built-in transceiver automatically adjusts between 100 Mbps and 10 Mbps operational speeds depending on the network switch environment.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003e\n\u003cstrong\u003eCompact L-Series Form Factor:\u003c\/strong\u003e Integrates directly onto the L-Series DIN-rail mount system without requiring a bulky dedicated base unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eDistributed industrial control networks linking multiple PLC systems across large manufacturing plants.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eReal-time communication and variables transmission between PLC units and HMI\/SCADA management interfaces.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.5rem;\"\u003eRemote programming, diagnostic monitoring, and automated alarm notification via standard email services.\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    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold; width: 35%;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eMitsubishi Electric\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eLJ71E71-100-CM\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eProduct Series\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eMELSEC L Series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eModule Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eEthernet Interface Module\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eData Transmission Speed\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e100 Mbps (100BASE-TX) \/ 10 Mbps (10BASE-T)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eCommunication Port Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eRJ45 female connector\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eInternal Current Consumption (5 VDC)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0.60 A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eMax Simultaneous Connections\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e16 connections\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0.45 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003ePackage Dimensions (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e130 mm x 110 mm x 45 mm\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 #2b6cb0; text-align: left;\"\u003e\n        \u003cth style=\"padding: 0.75rem; font-weight: bold; width: 30%;\"\u003eConnector Pin\u003c\/th\u003e\n        \u003cth style=\"padding: 0.75rem; font-weight: bold;\"\u003eFunction \/ Assignment\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: 0.75rem; font-weight: bold;\"\u003ePin 1\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eTX+ (Transmit Data +)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003ePin 2\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eTX- (Transmit Data -)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003ePin 3\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eRX+ (Receive Data +)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003ePin 6\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eRX- (Receive Data -)\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\u003ch3\u003eAlternative Models \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe LJ71E71-100-CM is physically and functionally drop-in compatible with standard MELSEC L Series CPU systems. The \"-CM\" suffix indicates regional industrial standard compliance configurations, though identical Ethernet configurations apply inside GX Works2. In legacy migrations, verify your CPU unit firmware supports multi-connection network interfaces before integrating this module to prevent communication timeout faults.\u003c\/p\u003e\n\n\u003ch3\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eWhen adding the Ethernet module to an active L-Series CPU stack, recalculate your internal 5 VDC system bus current draw. This unit draws a constant 0.60 A. If combined with multiple positioning modules or high-density digital I\/O blocks, you may exceed the current supply limit of standard power modules (such as the L61P or L63P), which can cause random CPU lockups or system reset faults.\u003c\/p\u003e\n\n\u003ch3\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eTo prevent high-frequency EMI noise from adjacent high-voltage machinery or VFD cabling from disrupting network communication packets, always use Category 5e (or higher) double-shielded twisted pair (STP) cables. Securely connect the cable shielding mesh directly to the system's protective ground bus and establish a single-point earth ground for the rack assembly.\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;\"\u003e\n  \u003cstrong style=\"color: #9b2c2c; display: block; margin-bottom: 0.5rem;\"\u003eCRITICAL WARNING\u003c\/strong\u003e\n  \u003cp style=\"color: #9b2c2c; margin: 0;\"\u003eDisconnect all external power sources supplying the PLC system and network interfaces before inserting, removing, or wiring the communication module. Failure to completely de-energize the assembly can cause permanent backplane circuit damage, microprocessor failure, or unpredictable system behavior.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n  \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; min-width: 1.75rem; height: 1.75rem; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem;\"\u003e1\u003c\/div\u003e\n  \u003cp style=\"color: #2d3748; margin: 0;\"\u003eAlign the module's locking hook with the adjacent CPU module or base unit connector slot on the DIN rail.\u003c\/p\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; border-radius: 50%; min-width: 1.75rem; height: 1.75rem; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem;\"\u003e2\u003c\/div\u003e\n  \u003cp style=\"color: #2d3748; margin: 0;\"\u003ePress the modules together until they click firmly, and securely engage the mechanical locking levers at the top and bottom of the unit.\u003c\/p\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; border-radius: 50%; min-width: 1.75rem; height: 1.75rem; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem;\"\u003e3\u003c\/div\u003e\n  \u003cp style=\"color: #2d3748; margin: 0;\"\u003eInsert the RJ45 industrial Ethernet cable into the front communication port, ensuring the locking clip latches securely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n  \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; min-width: 1.75rem; height: 1.75rem; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem;\"\u003e4\u003c\/div\u003e\n  \u003cp style=\"color: #2d3748; margin: 0;\"\u003eApply power and verify that the front panel LED indicators display \"RUN\" and the Link\/Speed indicators flash on network activity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Mitsubishi Electric","offers":[{"title":"Default Title","offer_id":53102149009771,"sku":"LJ71E71-100-CM","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/lj71e71-100-cm-j5hpog0mijq.png?v=1776137800","url":"https:\/\/www.plcprotech.com\/de\/products\/mitsubishi-electric-lj71e71-100-cm-melsec-l-series-ethernet-interface-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}