Product Overview

The Allen‑Bradley 1747-UIC is a widely used USB‑to‑DH‑485 communication converter designed for the SLC 500 platform. It bridges modern USB computer ports and the classic DH‑485 network used by SLC processors such as the 1747‑L531, 1747‑L541 and other SLC 5/01, 5/02, 5/03, 5/04 controllers. Before this adapter, technicians relied on desktop PCs with native RS‑232 ports and dedicated serial cables; the 1747-UIC removes that limitation, letting users connect laptops without COM ports to upload, download, monitor and troubleshoot SLC PLC programs via RSLogix 500. It is a staple spare and service tool for maintenance teams supporting aging SLC installations worldwide.

Key Specifications

• Part Number: 1747-UIC
• Manufacturer: Allen‑Bradley (Rockwell Automation)
• Device Type: USB to DH‑485 Interface Converter
• Host Side: USB 1.1 / 2.0 compatible, virtual COM port
• Field Side: DH‑485 port
• Supported Protocols: DH‑485, DF1
• Driver: Virtual COM port driver for Windows operating systems
• Target Devices: SLC 500 Processors, SLC I/O adapters, PanelView terminals with DH‑485
• Cable Connection: DH‑485 port connects to SLC processor channel 0
• Power Supply: Powered directly from USB port, no external power adapter required
• Operating Temperature: 0 °C to +60 °C
• Storage Temperature: -40 °C to +85 °C
• Mounting: Portable handheld adapter, optional DIN rail mounting
• Software: RSLogix 500, RSLinx Classic
• End of Life: Original production discontinued, available as tested used / surplus units

Communication Features

The 1747-UIC creates a virtual serial port on your Windows computer, which RSLinx Classic recognizes as a standard DF1/DH‑485 driver. It supports point‑to‑point connection to a single SLC processor or multi‑drop connection on a DH‑485 network with multiple controllers and HMI devices. It handles signal conversion between USB and the differential DH‑485 bus, providing noise immunity suitable for industrial cabinet environments. This adapter only works for DH‑485 communication; it cannot be used to connect to the EtherNet/IP port on SLC 5/05 processors like 1747‑L551, 1747‑L552 and 1747‑L553. For Ethernet‑capable SLC CPUs, direct network connection is recommended instead.

Application Scenarios

This converter is essential for on‑site servicing of legacy SLC 500 systems. Typical use cases include PLC program backup before scheduled shutdowns, program edits and online monitoring, fault diagnosis, clock setting, troubleshooting communication failures, and commissioning replacement SLC processors or I/O modules. It is carried by field service engineers for packaging lines, conveyor systems, wastewater treatment plants, printing machinery, metal working equipment and batch process skids. Many integrators keep spare 1747-UIC adapters in their toolkits, as older serial programming cables are fragile and modern laptops no longer ship with physical RS‑232 ports.

Compatibility

The 1747-UIC is built exclusively for the SLC 500 DH‑485 network. It works with SLC 5/01, 5/02, 5/03 and 5/04 processors that have Channel 0 DH‑485 ports. It also supports DH‑485 PanelView HMIs and SLC remote I/O adapters on the DH‑485 bus. It requires RSLinx Classic and RSLogix 500 for programming workflow. It is not compatible with ControlLogix, CompactLogix, MicroLogix, or other Rockwell platforms that use separate communication adapters. If you need to program an SLC 5/05 processor, you may use its built‑in Ethernet port rather than this DH‑485 converter.

Product Supply & Testing Note

We supply fully tested 1747-UIC units. Each adapter is checked for USB enumeration, driver recognition, DH‑485 signal output and communication connectivity with SLC processors before shipment. We verify there are no damaged pins, cracked housings or internal board faults. Since Rockwell stopped manufacturing this model, stock runs limited and fluctuates frequently. Combined orders with SLC processors, 1747‑BA backup batteries, I/O cards and programming accessories are accepted. Please send your inquiry with quantity and delivery timeline if you need bulk stock for your service team.

Frequently Asked Questions

Q: Can 1747-UIC connect to SLC 5/05 1747-L551? A: It can connect only to the DH‑485 serial channel of the SLC 5/05. For Ethernet programming, use the onboard RJ45 port directly.

Q: What software do I need for 1747-UIC? A: RSLinx Classic for driver configuration and RSLogix 500 for PLC programming.

Q: Is the 1747-UIC powered externally? A: No, it draws its operating power from the USB port of your laptop or PC.

Q: What is the difference between 1747-UIC and a regular USB to RS232 cable? A: A simple USB‑RS232 cable cannot convert to DH‑485 differential signaling; the 1747-UIC is purpose‑built for the DH‑485 bus protocol and electrical standard.

Q: Can it run on newer Windows versions? A: It relies on legacy virtual COM drivers, which are most stable under older Windows versions commonly used with RSLinx Classic.

Why Choose Us for 1747-UIC

We specialize in legacy Allen‑Bradley SLC 500 spare parts and programming accessories for industrial service companies and factory maintenance departments. We know that without a working DH‑485 adapter, technicians cannot back up or modify SLC programs, which can delay maintenance work and production recovery. Every unit is carefully packed with anti‑static protection, we provide clear photos, fast quotation and worldwide shipping. If you need help confirming the correct programming cable or adapter for your SLC processor model, our team can cross‑reference for you.

1747-UIC