PLCs, Power Supplies & Others

This link module provides cost-effective serial communication for distributed control networks. It connects field devices to the main controller through reliable RS-485 links. The unit supports both peer-to-peer and multi-drop network configurations.

Technical Specifications

Mechanical Design and Installation

This link module features a compact 30 mm wide housing for space-saving backplane installation. Its ultra-lightweight design weighs only 0.10 kilograms. The device inserts directly into dedicated controller rack slots. Guide rails ensure proper alignment during module insertion and removal.

Power Supply and Electrical Characteristics

The module derives its operating power entirely from the 5 V DC backplane supply. It draws a maximum current of 300 milliamperes during active communication. This low power draw reduces overall system energy consumption. The module does not need any external power connections.

Communication Interface and Network Capabilities

An RS-485 port provides robust serial connectivity for field devices. The two-wire half-duplex configuration supports multi-drop networking. The system accommodates up to 31 nodes on a single network segment. Shielded twisted-pair cabling extends up to 500 meters in length. This reach suits most medium-sized industrial facilities.

Protocol and Data Transfer

The module uses Fuji’s proprietary link protocol for reliable data exchange. It handles both cyclic and on-demand communication patterns. The transmission speed reaches 38.4 kbit/s for responsive control. The receive buffer stores 2 KB of incoming data. The transmit buffer holds 1 KB of outgoing packets.

Isolation and Noise Immunity

The module provides 500 V RMS galvanic isolation on the field side. This isolation protects the controller from ground loops and electrical noise. The differential signaling further enhances noise immunity. These features ensure stable communication in electrically noisy factory environments.

Diagnostic Feedback and Status Monitoring

Two front-panel LEDs provide essential communication status information. The green Power LED confirms that backplane voltage is present. The amber Communication LED flashes during data transmission or reception. A steady amber light indicates network activity without errors. An unlit LED signals a communication fault.

Energy Storage and Operational Stability

Internal capacitors provide transient suppression for the supply line. These capacitors also maintain module operation during brief power dips. The hold-up time reaches approximately 5 milliseconds. This short duration prevents communication resets during minor supply interruptions.

Application Suitability and Cost Efficiency

This link module offers an economical solution for serial communication needs. It works effectively in small to medium automation installations. The device suits conveyor control, packaging machinery, and material handling. Its low cost makes it ideal for budget-conscious projects. The operating temperature ranges from 0°C to +55°C.

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