Description
Product Introduction & Engineering Value
Many legacy PLC-5 and SLC 500 systems continue to operate on Data Highway Plus (DH+) or Remote I/O (RIO) networks. When engineers need to troubleshoot these systems using a modern workstation, network access—not the controller—is often the biggest challenge.
The Allen-Bradley 1784-PKTX/B provides that bridge. Installed in a PCI slot, it enables engineering software such as RSLinx to communicate with DH+, DH-485, and RIO networks for programming, online monitoring, diagnostics, and commissioning. Although Rockwell Automation discontinued the product in March 2022, it remains widely used to support existing PLC-5 installations.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Catalog Number | 1784-PKTX/B |
| Product Family | 1784 PKTx |
| Module Type | PCI Communication Card |
| PCI Interface | Universal PCI 2.3 |
| Number of Channels | 1 |
| Supported Networks | Data Highway Plus (DH+), DH-485, Remote I/O (RIO) |
| DH+ Connector | 3-pin Phoenix |
| DH-485 Connector | 6-pin Phoenix |
| Diagnostic Indicators | One status LED per channel |
| Maximum Cards per PC | 4 (jumper configurable) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Relative Humidity | 5–95% non-condensing |
| Host Operating Systems | Windows platforms supported by the PKTx driver and compatible RSLinx versions |
| Power Source | PCI Bus |
| Product Lifecycle | Discontinued (March 31, 2022) |
Field Application & The “Trench” Experience
A maintenance contractor was called to troubleshoot a PLC-5-controlled wastewater treatment facility after a processor replacement failed to restore communications. The PLC was healthy, but none of the engineering laptops could establish an online connection through the plant’s DH+ network.
The issue turned out to be the absence of a compatible DH+ interface. After installing a 1784-PKTX/B in an industrial service computer and configuring the correct RSLinx driver, the engineering team immediately gained online access. Within minutes they identified a failed Remote I/O adapter rather than a processor fault, reducing unnecessary hardware replacement.
Typical applications include:
- PLC-5 migration projects requiring temporary DH+ connectivity.
- Remote I/O scanner diagnostics during manufacturing line maintenance.
- Legacy SLC 500 commissioning using DH-485 engineering access.
- 1784-PKTX B
- 1784-PKTX B
Transparency SOP: QA & Testing
Every communication card undergoes a documented validation procedure before shipment.
- Confirm the catalog number, Series B revision, and manufacturer markings.
- Inspect the PCI edge connector, Phoenix terminals, and PCB for damage.
- Install the card in a compatible PCI test workstation.
- Verify successful driver recognition within RSLinx.
- Test communication over DH+, DH-485, and Remote I/O using reference hardware.
- Record communication performance and LED diagnostics before releasing the card as New Surplus or Refurbished.
The Veteran’s Tech Trap Guide
⚠️ PCI Means PCI—Not PCI Express
The 1784-PKTX/B requires a standard PCI slot. Most modern industrial PCs include only PCI Express (PCIe) slots, making the card physically incompatible without a system that still supports conventional PCI.
⚠️ Driver Compatibility Matters
Even if Windows recognizes the hardware, communication will fail unless the correct RSLinx PKTx driver is installed and configured. Verify both the driver version and network parameters before assuming the card is defective.
PRO TIP: Before purchasing a replacement card, confirm that your engineering workstation still includes a legacy PCI bus. Many maintenance teams discover this compatibility issue only after receiving the hardware.
Dynamic FAQ
Q1. What networks does the 1784-PKTX/B support?
The card supports Data Highway Plus (DH+), DH-485, and Remote I/O (RIO) communication from a host PC.
Q2. Is the 1784-PKTX/B compatible with modern PCI Express slots?
No. It is designed for the standard PCI bus. A PCIe-only computer cannot directly accept the card without appropriate legacy hardware support.
Q3. Which software typically uses this communication card?
The card is commonly used with RSLinx Classic and compatible Rockwell engineering software for programming, diagnostics, and online monitoring of PLC-5 and SLC systems.
Q4. Is the 1784-PKTX/B still manufactured?
No. Rockwell Automation discontinued the 1784-PKTX product family on March 31, 2022 and classifies it as an engineering replacement product.
Q5. How is New Surplus inventory authenticated?
Each card is inspected for hardware revision, connector integrity, PCI communication, network connectivity, and functional operation using reference DH+, DH-485, and RIO equipment before shipment.
Q6. What is the most common installation issue?
The most common problems are attempting to install the card in a PCIe-only computer, using an unsupported operating system, or configuring an incorrect RSLinx communication driver. Verifying PC hardware compatibility should always be the first step before troubleshooting the network.
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