MITSUBISHI QJ71LP21-25

Mitsubishi MELSECNET/H Data Link Unit QJ71LP21-25

Description

This is a QJ71LP21-25 Data Link Unit for the Mitsubishi MELSEC-Q series. It functions as a master or local station module for the high-speed MELSECNET/H network system, utilizing an optical fiber loop for reliable communication in industrial environments. This module is essential for creating robust, large-scale control systems with distributed I/O and peer-to-peer communication.

Specifications

• Manufacturer: Mitsubishi Electric
• Product Series: MELSEC-Q
• Model: QJ71LP21-25
• Function: MELSECNET/H Network Module (Master/Local)
• Communication Type: Optical Fiber Loop (SI/GI Cable)
• Transmission Speed: 10/25 Mbps (switchable)
• Max. Stations: 65 (1 master, 64 local)
• I/O Points Occupied: 32

Label Info

• Model: QJ71LP21-25
• Serial: 061226063445029-D

Application

Ideal for connecting distributed PLC systems over long distances where electrical noise immunity is critical, such as in large manufacturing plants, automotive assembly lines, and process control applications.

Country of Origin

Made in Japan.

CO2 Impact

Choosing this reused QJ71LP21-25 module saves an estimated 10.0 kg of CO2 compared to producing a new one. This is equivalent to the emissions from driving a standard car for 50 kilometers.

Availability

This is an obsolete item, but it is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

Question? What type of optical fiber cable is required for the QJ71LP21-25?

Answer

The QJ71LP21-25 is compatible with both SI (Step Index) and GI (Graded Index) type multi-mode optical fiber cables, commonly with a core/cladding diameter of 50/125 micrometers or 62.5/125 micrometers.

Question? Can this module be used in a new system setup today?

Answer

While this module is fully functional, it is part of the obsolete MELSEC-Q series. For new installations, Mitsubishi recommends migrating to the newer MELSEC iQ-R series and its corresponding network modules for long-term support and availability.

Question? How do I set the station number on the QJ71LP21-25?

Answer

The station number is set using the two rotary switches on the front of the module. The top switch sets the ‘x10’ digit and the bottom switch sets the ‘x1’ digit, allowing you to configure station numbers from 0 to 64.

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Last Update: Friday, March 13, 2026