QJ71E71-100 Ethernet Interface Module 10/100Mbps RJ45 | Mitsubishi

The Original New Mitsubishi QJ71E71-100 is an Ethernet interface module for the MELSEC-Q series PLC system, designed to enable seamless connectivity to control systems, host computers, and higher-level networks via 10BASE-T/100BASE-TX. Supporting up to 16 simultaneous connections, this module facilitates high-speed data exchange with up to 16 external devices using TCP/IP and UDP/IP protocols. It features a fixed buffer of 1K words × 16 and a random access buffer of 6K words × 1 for flexible data handling. With an RJ45 connector, 0.50 A current consumption, and compact 98 × 27.4 × 90 mm dimensions, the QJ71E71-100 is a reliable solution for factory automation, process control, and machine networking applications.

Core Engineering Highlights:
10/100 Mbps auto-negotiation (10BASE-T/100BASE-TX) | RJ45 connector | 16 simultaneous connections | 1K words × 16 fixed buffer + 6K words × 1 random access buffer | Email transmission/reception with attachments | 32 occupied I/O points | 0.50 A @ 5V DC current consumption | 98 × 27.4 × 90 mm dimensions | 0.11 kg weight

Key Features:

• Original New Mitsubishi QJ71E71-100 module

• Ethernet interface for MELSEC-Q series PLCs

• 10BASE-T/100BASE-TX auto-negotiation

• RJ45 connector for standard Ethernet cabling

• Up to 16 simultaneous connections for multi-device communication

• Fixed buffer memory: 1K words × 16 for data exchange

• Random access buffer: 6K words × 1 for flexible data handling

• TCP/IP and UDP/IP protocol support

• Email transmission/reception with attachments (6K words × 1, body: 960 words × 1)

• 32 occupied I/O points (I/O assignment: Intelligent 32 points)

• Compact design: 98 × 27.4 × 90 mm

• Lightweight: 0.11 kg

• CE, UL/cUL, marine approvals (ABS, BV, DNV GL, LR, NK, RINA)

• RoHS compliant

• Direct connection to PLC CPU via dedicated instructions

• Web server function support

Applications:

• Integration of MELSEC-Q series PLCs into Ethernet networks

• Machine and plant control via TCP/IP or UDP/IP

• Process automation and data acquisition

• Connection to SCADA systems and host computers

• Email notification for system status and alarms

• Remote monitoring and maintenance

• Data exchange between multiple PLC CPUs and higher-level systems

Technical Specifications:

System Compatibility:

• Compatible with Mitsubishi MELSEC-Q series CPU modules (Q00J, Q00, Q01, Qn, QnH, QnPH, QnPRH, QnU series)

• Installs in Q series main base unit or expansion base unit (1 slot)

• Supported by products with serial number prefix 15042 or later

• Programming and configuration via GX Works2 or GX Developer

• Dedicated PLC instructions for data transmission (OPEN, CLOSE, BUFSND, BUFRCV, etc.)

Related Products:

• QJ71E71-B5 – Ethernet interface module (10BASE5/10BASE-T, BNC connector)

• QJ71E71-B2 – Ethernet interface module (10BASE2, coaxial connector)

• QJ71C24N-R2 – Serial communication module (2 × RS-232)

• QJ71MT91 – MODBUS/TCP interface module

• LJ71E71-100 – Ethernet interface module for MELSEC-L series

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Mitsubishi and MELSEC are trademarks of Mitsubishi Electric Corporation.