OVERVIEW

Official designation: Mitsubishi QJ72LP25G (MELSEC-Q Series, MELSECNET/H Network Module)

Role/Application: An optical loop remote I/O station unit for the MELSECNET/H network, supporting a 25 Mbps high-speed data link and stable, real-time data exchange in distributed control systems.

KEY SPECS SUMMARY

Power: 5 V DC, 0.6 A internal current

Interfaces / Ports: 2-core optical connector plug

Indicators: Refer to the latest manufacturer manual.

Operating Temp: 0 to 55 degrees C

Platform / Compatibility: MELSEC-Q Universal Base Unit

Limit: 65 total stations, 8192 remote I/O points

Lifecycle: End of life announced, last time buy January 2029

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum distance between stations using the optical fiber?

A: Maximum station-to-station distance is 2 kilometers using GI-50/125 optical cable.

Wiring & Installation:

Q: What specific type of fiber optic cable is required for the QJ72LP25G?

A: The unit requires GI-50/125 micrometer grade optical fiber cable.

Troubleshooting & Compatibility:

Q: What type of network topology does the QJ72LP25G support?

A: The module operates on a duplex loop network topology using a token ring method.

Replacement & Upgrades:

Q: What are the primary alternative models for the QJ72LP25G in a new system?

A: Alternative models include the CC-Link IE Field RJ71GF11-T2 or RJ72GF15-T2 series modules.