Overview
The Allen-Bradley 1784-KT is a half-size ISA communication interface module designed to integrate personal computers and workstations into Data Highway Plus (DH+) industrial networks. This 8-bit ISA card connects directly to PLC-5, PLC-3, and PLC-2 controllers, providing both synchronous DH+ communication and asynchronous serial connections. The module’s dual-port resident memory passes preformatted DH+ packets, enabling reliable industrial-grade data exchange.
Key Features
- DH+ Network Connectivity: Enables a computer to act as an active node on DH+ networks with higher throughput compared to RS-232
- Multi-Controller Support: Single cable connection to PLC-5, PLC-3, and PLC-2 controllers
- Flexible Installation: Half-size 8-bit ISA card installable in any 16-bit or 8-bit ISA expansion slot
- Standard Connector: 62-pin D-shell connector for network and controller links
- Built-in Diagnostics: Host-powered diagnostics verify module operation upon boot
Technical Specifications
- Power Supply (5V): 0.4 Amps at 5 Volts DC (2 Watts)
- Power Supply (±12V): 0.04 Amps at ±12 Volts DC (0.48 Watts)
- DH+ Data Rate: 57.6 Kbaud
- Serial Baud Rates: 9600 and 19,200 baud for PLC-2/PLC-3 asynchronous connections
- IRQ Support: IRQ3 (Com 2), IRQ4, IRQ5, and IRQ7
- Operating Temperature: 32 to 130 degrees Fahrenheit
- Humidity Range: 5 to 95% relative humidity
- Module Weight: 0.30 lbs
- Module Dimensions: 5 × 6 × 1 inches
- Connector Type: 62-pin D-shell
Typical Applications
- Legacy PLC-5, PLC-3, and PLC-2 network integration with modern computers
- SCADA workstations requiring real-time DH+ communication
- Industrial data acquisition and monitoring over DH+ networks
- Retrofit and upgrade installations for established automation systems
Compatibility & Replacements
The 1784-KT is compatible with 8-bit and 16-bit ISA bus computers and directly supports PLC-5, PLC-3, and PLC-2 controllers via DH+ or asynchronous serial interfaces. Replacement part numbers include 1784-KT/B, 96058877, and 96272282. The module has been discontinued by the manufacturer but remains in use for maintenance and upgrade applications in legacy control systems. Software compatibility includes Allen-Bradley interface tools such as 6001-F1E, 6200, Interchange, and ControlView. Always verify ISA slot availability and IRQ configuration in your host computer before installation.
