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- Allen Bradley
- 1785-KA
- PLC-5 Data Highway Communication Adapter Module
- USA
- 115 x 317 x 160 mm
- 0.88 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Allen-Bradley 1785-KA is a communication adapter module used in the PLC-5 system. It provides an interface between Data Highway (DH) and Data Highway Plus (DH+) networks, enabling communication between PLC-5 controllers and other industrial devices.
It is commonly installed in a 1771 I/O chassis and is used for legacy industrial networking and messaging applications in older Allen-Bradley automation systems.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | 1785-KA |
| Product Type | Communication Adapter Module |
| System | PLC-5 Series |
| Network Support | Data Highway (DH), Data Highway Plus (DH+) |
| Function | Network bridging / message communication |
| Backplane Power | 5 V DC, approx. 1.4–2.0 A |
| Communication Speed | Up to ~57.6 kbps |
| Installation | 1771 I/O chassis |
| Interface Ports | DH+, DH, and terminal interface ports |
| LED Indicators | Status / diagnostic LEDs |
| Max Modules per System | Up to 4 |
| Dimensions | 115 × 317 × 160 mm |
| Weight | 0.88 kg |
Function and Working Principle
The 1785-KA acts as a communication bridge module between industrial networks.
It works by:
- Connecting PLC-5 systems to Data Highway (DH) networks
- Providing access to Data Highway Plus (DH+) for high-speed messaging
- Allowing PLC processors to exchange data across network nodes
- Managing communication routing and message handling
- Supporting configuration via DIP switches for node addressing and network settings
It does not perform control logic, only communication bridging.
Key Features
- Bridges DH and DH+ networks
- Supports legacy PLC-5 communication systems
- Multi-node industrial network integration
- Built-in diagnostic indicators
- Configurable via hardware switches
- Reliable industrial-grade design
Industrial Applications
- Legacy PLC-5 automation systems
- Factory-wide industrial communication networks
- Distributed control system messaging
- Equipment-to-equipment data exchange
- Retrofit and maintenance of older automation plants
Role in Industrial Systems
The module is used to:
- Enable communication between PLC-5 controllers
- Link different industrial network segments
- Support legacy Data Highway infrastructure
- Maintain interoperability in older automation systems
It is a key networking component in legacy Allen-Bradley architectures.
Installation Notes
- Installed in a 1771 I/O chassis
- Requires correct backplane power supply
- DIP switch configuration required for network addressing
- Proper termination required on Data Highway networks
- Should only be used in compatible PLC-5 systems
Compatible Equipment
- Allen-Bradley PLC-5 controllers
- 1771 I/O chassis systems
- Data Highway (DH) and DH+ networks
- Legacy Allen-Bradley communication modules
Advantages
- Enables communication in legacy PLC systems
- Reliable industrial network bridging
- Supports multi-node communication
- Proven long-term industrial durability
- Essential for maintaining older installations
Limitations
- Obsolete / legacy technology
- Not compatible with modern Ethernet/IP systems
- Requires specialized knowledge for configuration
- Limited speed compared to modern industrial networks
Conclusion
The Allen-Bradley 1785-KA PLC-5 Communication Adapter Module is a legacy industrial networking component designed to bridge Data Highway and Data Highway Plus systems.
It remains important in maintaining and integrating older PLC-5 automation infrastructure within industrial environments.