HITACHI LINK-H Communication Link Module

Technical Specifications

• Supports Peer-to-Peer networking for millisecond-level PLC data synchronization.
• LINK-H (Coaxial) or OLINK-H (Fiber) options to suit varying distances and environments.
• 100% EMI isolation via fiber-optic; hardware-level noise suppression on coaxial versions.
• Non-polarity wiring and automated fault isolation for 24/7 network continuity.

The LINK-H module operates in heavy-duty industrial environments subject to high electromagnetic interference. It interconnects multiple Hitachi PLC nodes or remote I/O stations into a full-duplex, deterministic real-time data transmission network. Utilizing a token control mechanism for global data refreshing, LINK-H supports high-speed Peer-to-Peer communication. This architecture allows nodes to interconnect directly, bypassing the need for a master station.

Common Applications

Lifecycle and Market Status

The HITACHI LINK-H belongs to a discontinued, legacy product series. Serving as a core network hub within legacy H-series PLC systems, this module remains preferred for like-for-like in-place replacement to avoid modification of underlying programs. During large-scale system overhauls, operations transition through gradual upgrades toward newer Ethernet communication architectures, such as the Hitachi EH-150 or MICRO-EH.

Technical FAQ

Q: What is the LINK-H communication system?
A:LINK-H is Hitachi's proprietary serial communication protocol used for data interaction between climate units and external controllers.

Q: What is the core control function of HITACHI LPA210A?
A:  It supports 3-phase AC motor, servo, position, speed, and torque control.

Q: What is the maximum connection capacity of a LINK-H system?
A: The standard version supports 16 outdoor units and 128 indoor units; H-LINK II can support up to 64 outdoor units and 160 indoor units.

Q: Does LINK-H wiring have polarity requirements?
A: LINK-H utilizes non-polarity wiring, so there is no need to distinguish between positive and negative terminals during connection.

Q: Are your products brand new?
A: Yes. We only supply 100% original and brand-new products. All items are sourced through authorized channels and have never been used or refurbished.

Q: Why can customers buy with confidence?
A: Because every product is backed by our 1-Year Warranty Guarantee of Quality, ensuring reliability, customer satisfaction, and long-term support after delivery.

Q: Do you provide international shipping?
A: Yes. We ship products to customers worldwide using reliable international logistics services such as EMS, DHL, UPS, and FedEx.

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