Allen Bradley 1747-AIC SLC 500 Isolated DH-485 Link Coupler

Product Overview

The Allen Bradley 1747-AIC serves as the primary network interface for connecting SLC 500 processors and peripheral devices to a DH-485 network. This isolated link coupler provides a critical physical layer connection, ensuring stable data transmission between controllers, HMIs, and programming terminals. We supply this unit as 100% Brand New original hardware, delivering the electrical isolation necessary to protect your automation assets from ground loops and industrial noise.

Technical Specifications

The 1747-AIC features specialized circuitry designed to maintain signal integrity across extended DH-485 cable runs.

Engineering Advantages

• 1500V DC Electrical Isolation: The 1747-AIC incorporates a robust isolation barrier that withstands up to 1500V DC. This protects the SLC 500 processor from transient voltages and ground potential differences that often occur in large-scale plant networks spanning long distances.

• Versatile Network Topology: This coupler supports both full-duplex and half-duplex DH-485 configurations. It enables seamless communication between the controller and a variety of peripherals, including 1747-PIC interface converters and 1747-DTAM-E modules, without requiring external power for the link signals.

• Simplified Field Wiring: The 6-position removable terminal block allows for rapid wiring and maintenance. Technicians can pre-wire the network trunk and simply plug the block into the coupler, reducing the risk of wiring errors and minimizing downtime during system expansions.

• Industrial Grade Durability: Designed for high-temperature environments, the 1747-AIC operates reliably up to 140°F (60°C). Its compact, lightweight design fits easily into crowded control cabinets while maintaining the physical rigidity needed for vibration-prone industrial settings.

FAQs

• When do I need to use a 1747-AIC instead of a direct cable connection?

  You must use the 1747-AIC whenever you connect an SLC 5/01, 5/02, or 5/03 to a DH-485 network trunk. The coupler provides the necessary 1500V isolation that standard cables lack, preventing ground loops from damaging the CPU’s communication port.

• Does the 1747-AIC require an external power source?

  The 1747-AIC typically draws power from the SLC 500 processor or the peripheral device connected via the communication cable. If you are using the coupler as a standalone repeater or with certain non-powered devices, you may need to provide an external 24V DC source to the link side.

• Can I use this coupler with 1747-PIC Personal Interface Converters?

  Yes. The 1747-AIC fully supports the 1747-PIC. This allows you to connect a PC for programming or monitoring while maintaining the isolation barrier between the computer and the industrial network.

• What is the maximum distance supported by the 1747-AIC?

  In a standard DH-485 network using the 1747-AIC, the total trunk length can reach up to 4,000 feet (1,219 meters). Ensure you use high-quality shielded twisted-pair cable to maintain signal quality at these maximum distances.