Allen-Bradley 1784-KTXD – ISA Bus Communication Module | ControlNet / DH+ Platform
Engineering Background
The Allen-Bradley 1784-KTXD is a legacy ISA-bus communication interface card designed for Rockwell Automation’s industrial networking ecosystem. Engineered for integration into PC-based workstations equipped with ISA expansion slots, this module provides a direct hardware bridge between host computers and Allen-Bradley industrial networks — enabling real-time programming, monitoring, and diagnostics of PLC-controlled systems without the latency overhead of software-only communication stacks.
Product Positioning
Targeted at maintenance engineers, system integrators, and OEM rebuild teams managing legacy Allen-Bradley installations, the 1784-KTXD remains a critical spare for facilities running ControlNet or Data Highway Plus (DH+) architectures where ISA-slot workstations remain in service. Konmask supplies this module as a verified genuine component, supporting both active production environments and long-term spare-parts programs.
Complete Technical Specifications
| Catalog Number | 1784-KTXD |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Form Factor | ISA Bus Card (Half-Length) |
| Network Protocol | Data Highway Plus (DH+) / ControlNet |
| Communication Interface | ISA 16-bit expansion slot |
| Supported Baud Rates | 57.6 kbps / 115.2 kbps (DH+) |
| Node Addressing | Configurable via onboard DIP switches (0–77 octal) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Power Consumption | Supplied via ISA bus (5 VDC) |
| Weight | Approx. 200 g |
| Compatible Software | RSLinx Classic, RSLogix 500, RSLogix 5 |
| Operating System Support | Windows NT / 2000 / XP (32-bit) |
| Certifications | UL Listed, CE Marked |
Proven Application Environments
- Automotive Manufacturing: Legacy PLC-5 and SLC 500 programming stations on DH+ networks requiring direct ISA card connectivity.
- Oil & Gas: Distributed control systems with ControlNet backbones where PC-based HMI workstations retain ISA slots.
- Water & Wastewater Treatment: SCADA integration with Allen-Bradley PLCs via DH+ for remote monitoring and parameter adjustment.
- Food & Beverage Processing: Retrofit and maintenance programming of SLC 500 / PLC-5 controllers in hygiene-critical environments.
- Power Generation & Utilities: Long-lifecycle control systems where ISA-based communication infrastructure remains operational.
- OEM Machine Builders: Spare-parts programs for machines originally commissioned with 1784-KTXD-equipped programming terminals.
Engineering Advantages
- Direct Hardware Communication: ISA bus interface eliminates USB/Ethernet conversion overhead, delivering deterministic low-latency communication critical for real-time PLC programming and diagnostics.
- Dual Network Support: Single card supports both DH+ and ControlNet topologies, reducing spare-parts inventory complexity for multi-network facilities.
- DIP-Switch Node Configuration: Hardware-level node addressing ensures stable network identity independent of software configuration — essential for fault-tolerant industrial environments.
- RSLinx Classic Compatibility: Fully supported by Rockwell’s RSLinx Classic driver stack, enabling seamless integration with existing RSLogix programming workflows.
- Proven Long-Term Reliability: Designed to Rockwell Automation’s industrial-grade standards with extended temperature tolerance and robust EMI shielding for harsh plant-floor environments.
System Architecture & Signal Flow
The 1784-KTXD installs into an available ISA 16-bit slot in the host PC. Upon driver initialization via RSLinx Classic, the card establishes a logical communication path to the target Allen-Bradley network:
- DH+ Mode: The card connects via a DB-15 or terminal-block cable to the DH+ network trunk. Node address is set via onboard DIP switches. RSLinx Classic assigns a driver instance (e.g., 1784-KTX, DH+) enabling RSLogix 500/5 to upload/download programs and perform online monitoring.
- ControlNet Mode: The card interfaces with the ControlNet coaxial or fiber backbone via the appropriate tap and cable assembly. RSLinx Classic’s ControlNet driver manages scheduled and unscheduled messaging.
- Software Layer: RSLinx Classic → 1784-KTXD Driver → ISA Bus → Network Physical Layer → Target PLC Processor.
Sourcing & Quality Verification
Konmask sources the 1784-KTXD exclusively through verified industrial distribution channels and authorized surplus networks. Each unit undergoes the following pre-shipment verification process:
- Visual inspection for physical damage, corrosion, and counterfeit indicators
- Firmware version and label authenticity cross-check against Rockwell Automation documentation
- Functional communication test where test equipment is available
- Anti-static packaging with humidity indicator card for transit protection
Konmask does not supply grey-market, remarked, or unverified-origin components. All units are shipped with a Konmask quality inspection record.
Procurement Process
- Inquiry Submission: Contact Konmask via the product page, email, or phone with your required quantity and delivery timeline.
- Stock Confirmation: Our team confirms current stock status and provides a formal quotation within 1 business day.
- Order Placement: Purchase order accepted via the Konmask online store or direct PO for B2B accounts.
- Quality Inspection: Each unit is inspected and documented prior to dispatch.
- Shipping: Dispatched via tracked international courier (DHL / FedEx / SF Express) with full export documentation.
- After-Sales Support: Technical assistance available post-delivery for installation and driver configuration queries.
Technical FAQ
Q: Is the 1784-KTXD compatible with Windows 10 or 11?
A: No. The 1784-KTXD requires a physical ISA bus slot, which is absent in modern PC hardware. It is supported under Windows NT, 2000, and XP (32-bit) with RSLinx Classic. For modern OS environments, consider the 1784-U2DHP (USB to DH+) or 1784-PCMK alternatives.
Q: Can this card communicate with ControlLogix (1756) processors?
A: The 1784-KTXD communicates via DH+ and ControlNet. ControlLogix processors with a 1756-DHRIO or 1756-CNB bridge module can be reached via these networks. Direct EtherNet/IP communication is not supported by this card.
Q: What cable is required for DH+ connection?
A: A Belden 9463 (blue hose) shielded twisted-pair cable with appropriate DH+ connectors is the standard. The 1784-KTXD uses a DB-15 connector on the card bracket.
Q: Do you provide a warranty?
A: Konmask provides a 90-day functional warranty on all verified units. Extended warranty and exchange programs are available for volume procurement accounts — contact us for details.
Q: Can I request a test report or inspection certificate?
A: Yes. A Konmask inspection record is included with every shipment. Third-party testing certificates can be arranged for volume orders upon request.
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