Allen-Bradley 1784-KTCS – ControlNet Scanner Card | PLC-5 & SLC 500 Platform
Engineering Background: The 1784-KTCS is a Rockwell Automation / Allen-Bradley ISA-bus ControlNet scanner card designed to connect a host PC or programming workstation directly to a ControlNet network. Introduced as part of the 1784 series communication interface family, it provides deterministic, high-speed access to ControlNet-attached controllers, I/O adapters, and peer devices — making it the standard interface for PLC-5 and SLC 500 system commissioning, diagnostics, and SCADA integration.
Product Positioning: Targeted at automation engineers maintaining legacy ControlNet architectures, the 1784-KTCS remains the authoritative hardware interface for RSNetWorx for ControlNet configuration, RSLogix 5 / RSLogix 500 online programming, and real-time data acquisition from ControlNet nodes. Konmask.com supplies tested, genuine units with full traceability for MRO and capital project procurement.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1784-KTCS |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Network Protocol | ControlNet (CTDMA, IEC 61158-2 compliant) |
| Host Bus Interface | ISA (Industry Standard Architecture) 16-bit |
| Network Data Rate | 5 Mbps (ControlNet standard) |
| ControlNet Ports | 2 × BNC coaxial (redundant media support) |
| Node Address Range | 1 – 99 (software configurable) |
| Max Scheduled Connections | Up to 99 connections per network |
| Operating Voltage | +5 VDC, +12 VDC (supplied via ISA bus) |
| Operating Temperature | 0 °C to +60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% – 95% non-condensing |
| Form Factor | Half-length ISA card |
| Weight | Approx. 200 g |
| Compatible Software | RSLinx Classic, RSNetWorx for ControlNet, RSLogix 5, RSLogix 500 |
| Compatible OS | Windows XP / Windows 7 (32-bit) with Rockwell driver |
| Certifications | UL Listed, CE Marked |
Proven Application Environments
- PLC-5 System Programming & Diagnostics: Online connection to PLC-5 processors via ControlNet for RSLogix 5 ladder logic editing, force operations, and fault diagnostics.
- SLC 500 ControlNet Integration: Interface for SLC 500 systems equipped with 1747-SCNR or equivalent ControlNet scanner modules.
- SCADA / HMI Data Acquisition: RSLinx Classic OPC/DDE server bridge between ControlNet field devices and supervisory software (FactoryTalk View, Wonderware, Ignition).
- RSNetWorx Network Configuration: Mandatory hardware interface for scheduling ControlNet connections, setting NUT (Network Update Time), and managing node parameters.
- Redundant Media Verification: Dual BNC ports enable simultaneous connection to both ControlNet cable A and cable B for media redundancy testing.
- Automotive & Discrete Manufacturing: Body-in-white lines, transfer press systems, and assembly conveyors using legacy ControlNet I/O racks.
- Oil & Gas / Utilities: DCS migration projects requiring continued access to existing ControlNet field bus segments during phased cutover.
Engineering Advantages
- Deterministic ControlNet Access: CTDMA protocol guarantees scheduled data delivery within a configurable NUT window (500 µs – 100 ms), critical for motion-coordinated and safety-adjacent applications.
- Dual-Port Redundant Media: Both BNC ports are active simultaneously, providing automatic failover if one coaxial segment is severed — no software intervention required.
- Deep RSLinx Integration: Recognized natively by RSLinx Classic as a ControlNet driver, enabling seamless OPC server configuration without third-party middleware.
- Proven Long-Term Reliability: ISA bus architecture eliminates PCI interrupt conflicts common in later-generation cards, making the 1784-KTCS the preferred choice for dedicated programming workstations.
- Low Latency Diagnostics: Direct hardware access to the ControlNet ASIC allows RSNetWorx to read real-time network health metrics (signal quality, missed packets, node status) without impacting scheduled traffic.
System Architecture & Signal Flow
The 1784-KTCS sits in an ISA slot of the host PC. The onboard ControlNet ASIC manages all CTDMA frame scheduling autonomously, offloading the host CPU. Data flow is as follows:
- Host Application (RSLogix 5 / RSLinx / RSNetWorx) issues read/write requests via the Rockwell 1784-KTCS Windows driver.
- Driver → ASIC: Requests are queued in the card’s dual-port RAM and scheduled into the next available unscheduled bandwidth window.
- ControlNet ASIC → Network: Frames are transmitted at 5 Mbps over the coaxial bus (RG-6 or RG-58) to the target node.
- Target Node Response: The addressed PLC-5, SLC 500, or I/O adapter returns data in the subsequent scheduled or unscheduled interval.
- ASIC → Host RAM: Received data is written to dual-port RAM and an interrupt is raised to the host driver for application delivery.
Redundant media (Cable A / Cable B) is monitored continuously; the ASIC switches to the healthy cable within one NUT cycle upon detecting a fault on the primary path.
Sourcing & Quality Verification
- Genuine Allen-Bradley Origin: All 1784-KTCS units are sourced from authorized distributors, certified MRO suppliers, or decommissioned OEM equipment with documented chain of custody.
- Pre-Shipment Functional Test: Each card is bench-tested in a live ControlNet segment — node address assignment, scheduled connection establishment, and RSLinx driver recognition are verified before dispatch.
- Visual & Component Inspection: PCB, BNC connectors, ISA edge connector, and onboard ASIC are inspected under magnification for counterfeit indicators, re-marking, or physical damage.
- Firmware Version Logging: Onboard firmware revision is recorded and provided with the shipment documentation upon request.
- Packaging: ESD-safe anti-static bag + foam-lined carton; humidity indicator card included for international shipments.
Procurement Process
- Submit Inquiry: Email support@konmask.com or call +0086 19859288691 with your required quantity and delivery timeline.
- Quotation & Lead Time: Formal quotation issued within 1 business day, including unit price, shipping options (DHL / FedEx / sea freight), and estimated delivery.
- Order Confirmation: Purchase order or proforma invoice accepted; payment via T/T bank transfer or secure online checkout.
- Quality Documentation: Test report, packing list, and commercial invoice provided with every shipment. Certificate of Origin available on request.
- After-Sales Support: 90-day warranty on all units; technical support for driver installation and RSLinx configuration included at no charge.
Technical FAQ
- Q: Is the 1784-KTCS compatible with Windows 10?
- A: The Rockwell 1784-KTCS driver is officially supported on Windows XP and Windows 7 (32-bit). Windows 10 is not officially supported by Rockwell; most engineers use a dedicated Windows 7 workstation or a virtual machine with ISA passthrough for this card. Rockwell’s current replacement for modern OS environments is the 1784-PCICS (PCI) or 1784-U2CN (USB).
- Q: Can the 1784-KTCS be used as a scanner (I/O controller) or only as a messaging interface?
- A: The 1784-KTCS functions as a ControlNet messaging and programming interface for the host PC. It does not act as a ControlNet I/O scanner in the same sense as a PLC backplane scanner module (e.g., 1756-CNB). It supports both scheduled and unscheduled messaging via RSLinx.
- Q: What cable type is required for the ControlNet connection?
- A: ControlNet uses RG-6 quad-shield coaxial cable with BNC connectors per the ControlNet specification. Maximum trunk length is 1,000 m (without repeaters). RG-58 is acceptable for short bench connections only.
- Q: What is the difference between 1784-KTCS and 1784-KTC?
- A: The 1784-KTC is an earlier ISA ControlNet card with a single BNC port (no redundant media support). The 1784-KTCS adds dual BNC ports for redundant ControlNet media — the “S” suffix denotes the redundant media capability.
- Q: Do you provide the RSLinx driver or installation guide?
- A: Rockwell Automation distributes RSLinx Classic through their software portal. Konmask.com provides a driver installation checklist and configuration guide as a courtesy document with each order.
- Q: What is the modern replacement for the 1784-KTCS?
- A: Rockwell’s recommended migration path is the 1784-PCICS (PCI bus, redundant media) or the 1784-U2CN (USB to ControlNet adapter) for workstations without ISA slots. Both support Windows 10 and later RSLinx versions.
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