QJ71LP21S-25 Mitsubishi Universal Model Redundant Power Supply Module

QJ71LP21S-25 Mitsubishi Universal model Redundant Power Supply Module

QJ71LP21S-25  Description​​

The Mitsubishi QJ71LP21S-25 is a high-performance ​​SI/QSI optical fiber network module​​ designed for the Mitsubishi Q Series programmable logic controller (PLC) systems. It serves as a ​​remote master station​​ within the MELSECNET/H and MELSECNET/10H industrial network systems, supporting high-speed, reliable data communication in large-scale industrial automation applications. This module is engineered for ​​dual-ring​​ network topology, enhancing system redundancy and reliability. It features an ​​external power supply function​​, ensuring stable operation even in demanding environments. It is capable of facilitating communication between PLCs (PLC-to-PLC network) and managing remote I/O stations (remote I/O network), making it ideal for distributed control systems in industries such as manufacturing, process control, and energy

​​QJ71LP21S-25 Features​​

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  ​​High-Speed Communication:​​ Supports transmission rates of ​​25 Mbps​​ (10 Mbps in MELSECNET/H mode)

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  ​​Dual-Ring Topology:​​ Enhances network reliability and redundancy by providing an alternate communication path in case of a cable break or station failure

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  ​​Large Network Capacity:​​ Supports up to ​​64 stations​​ in a PLC-to-PLC network (1 control station, 63 normal stations) and up to ​​65 stations​​ in a remote I/O network (1 remote master station, 64 remote I/O stations)

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  ​​Extended Distance:​​ Supports a total network distance of up to ​​30 km​​, with maximum distances between stations varying from 200 meters to 1 kilometer depending on the cable type and transmission speed

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  ​​High Data Capacity:​​ Offers substantial network points: LX/LY (8192 points), LB (16384 points), and LW (16384 points)

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  ​​External Power Supply:​​ Features an external power supply input (DC 20.4-31.2V) for enhanced operational stability

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  ​​Robust Communication Protocol:​​ Utilizes a token bus communication method, frame synchronization, and HDLC frame format with CRC error control and timeout retry for data integrity

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​​QJ71LP21S-25 Material & Primary Applications​​

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  ​​Material:​​ The module is constructed with industrial-grade electronic components, typically including a printed circuit board (PCB) with integrated circuits, optical interfaces, and a robust plastic or metal housing. The specific material composition is proprietary to Mitsubishi but is designed for durability and reliable operation in industrial environments.

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  ​​Primary Applications:​​ It is widely used in large-scale industrial automation systems requiring high-speed and reliable data communication, including:

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    ​​Factory Automation:​​ Connecting multiple PLCs, remote I/O stations, and intelligent device stations across a large manufacturing floor

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    ​​Process Control:​​ Monitoring and controlling distributed processes in industries like chemical, oil & gas, and water treatment

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    ​​Power Distribution Systems:​​ Integrating control and monitoring systems in power generation and distribution facilities

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​​QJ71LP21S-25 Key Parameters​​

The following table summarizes the key specifications of the Mitsubishi QJ71LP21S-25 module.