Mitsubishi QJ71E71-100 MELSEC-Q Ethernet Interface Module 100BASE-TX

Mitsubishi Electric MELSEC-Q series Ethernet interface module for integrating Q series PLCs into industrial Ethernet networks. Supports 100BASE-TX (100 Mbps) and 10BASE-T (10 Mbps) via RJ45 connector with auto-negotiation. Enables connection of Q series PLCs to control systems, host computers, workstations, and higher-level networks using TCP/IP or UDP/IP protocols. Provides up to 16 simultaneous connections and supports dedicated instructions for data exchange between PLC CPUs. Includes email function for sending system status notifications and file attachments. CE, UL/cUL certified.

Applications:

• Machine and plant control via Ethernet networking

• Process automation and remote monitoring

• Integration of Q series PLCs into factory Ethernet networks

• Data exchange between multiple PLC CPUs

Core Specifications:

• Interface: RJ45, 10BASE-T / 100BASE-TX

• Transmission speed: 10 Mbps / 100 Mbps (auto-negotiation)

• Communication modes: Full-duplex / half-duplex

• Protocols: TCP/IP, UDP/IP

• Maximum simultaneous connections: 16 (programmable controller accessible)

• Maximum segment length: 100 m

• Number of cascade connections: 2 levels max. (100BASE-TX), 4 levels max. (10BASE-T)

• Fixed buffer memory: 1K words × 16 (16K words total)

• Random access buffer: 6K words × 1

• Email function: Supports text (up to 960 words) and attachments (up to 6K words) in binary, ASCII, CSV formats

• Communication library: Available for web server access and remote operation via web browser

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

• Internal current consumption: 0.50 A at 5 V DC

• Dimensions (H × W × D): 98 mm × 27.4 mm × 90 mm

• Weight: approx. 0.11 kg

• Protection rating: IP20

• Operating temperature: 0 °C … 55 °C

System Integration:

• This module belongs to the Mitsubishi Electric MELSEC-Q series.

• Installs into any MELSEC-Q series base unit slot (main base or extension base).

• Compatible with Q series CPU modules (Q00J/Q00/Q01, Qn, QnH, QnPH, QnPRH, QnU series).

• Uses dedicated PLC instructions (e.g., OPEN, CLOSE, BUFSND, BUFRCV, SP.SOCSND, SP.SOCRCV) for data transmission.

• Multiple programming tools (GX Developer, GX Works2, GX Works3) can connect simultaneously for efficient debugging.

• Predefined protocol support via GX Works2 allows quick communication setup with third-party devices using protocol libraries (MODBUS, BACnet).

• KeepAlive and PING functions ensure network connection status monitoring.

• Supports CC-Link IE Field Network and MELSECNET/H integration.

• For detailed installation, parameter settings, and programming, refer to the MELSEC-Q/L Ethernet Interface Module User’s Manual.

Compatibility information:

• Compatible with MELSEC-Q series programmable controllers.

• Replacement/alternative models: RJ71EN71 (MELSEC iQ-R series), FX5-ENET (MELSEC iQ-F series).

Related Products:

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

• QJ71E71-B2 – Ethernet interface module, 10BASE2 (discontinued, predecessor)

• QJ71C24N(-R2/R4) – Serial communication module with predefined protocol support

• RJ71EN71 – Ethernet interface module for MELSEC iQ-R series (1000BASE-T)