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- Allen Bradley
- 1785-KA
- 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 designed for PLC-5 systems, providing connectivity between Data Highway (DH) and Data Highway Plus (DH+) networks. It enables message-based communication between PLC-5 processors and other Allen-Bradley devices, supporting legacy industrial automation architectures.
This module is primarily used in older Rockwell Automation PLC-5 control systems, especially where DH/DH+ networking is still in operation.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | 1785-KA |
| Product Type | Communication Adapter Module |
| System Compatibility | PLC-5 series controllers |
| Network Protocols | Data Highway (DH), Data Highway Plus (DH+) |
| Backplane Power | 5 V DC, approx. 1.4 A |
| Interface Ports | DH+, Data Highway, and terminal interface (series dependent) |
| Maximum Modules | Up to 4 per system |
| Mounting Type | 1771 I/O chassis slot |
| Dimensions | 115 × 317 × 160 mm |
| Weight | 0.88 kg |
| Configuration | DIP switch settings for node and baud configuration |
| Status Indicators | Diagnostic LEDs per channel |
Function and Working Principle
The 1785-KA module acts as a communication bridge in PLC-5 systems.
Working Principle
- Installed in a 1771 chassis backplane connected to a PLC-5 processor.
- Provides interface between Data Highway (DH) and Data Highway Plus (DH+) networks.
- Handles message-based communication between controllers and devices.
- PLC-5 processors send and receive data via Channel 3 communication routing.
- LEDs provide status and diagnostics for network communication health.
This enables inter-controller communication and supervisory system integration in legacy industrial networks.
Key Features
- Supports DH and DH+ industrial communication networks
- Designed for PLC-5 legacy control systems
- Enables inter-network communication bridging
- Supports up to 4 modules per system
- Built-in diagnostic LED indicators
- No external power supply required (backplane powered)
- Robust industrial-grade design for long-term operation
Industrial Applications
- Legacy manufacturing control systems
- Oil and gas pipeline monitoring (older installations)
- Power generation control systems
- Water treatment plants with PLC-5 infrastructure
- Industrial communication network bridging
- Factory automation retrofits and maintenance
Installation Overview
- Installed in 1771 I/O chassis slot
- Requires connection to PLC-5 processor backplane
- Configured via DIP switches (node address, baud rate, mode selection)
- Wired to DH/DH+ networks using dedicated connectors
- Diagnostic LEDs used for troubleshooting communication status
Compatible Systems
- Allen-Bradley PLC-5 series controllers
- 1771 I/O chassis systems
- DH and DH+ network infrastructure
- Legacy Rockwell Automation communication modules
Alternative Modules
| Model | Description |
|---|---|
| 1785-KA | Standard DH/DH+ communication adapter (this model) |
| 1785-KA5 | DH+ to DH-485 communication adapter variant |
| 1785-ENET | Ethernet communication module (modern alternative in upgraded systems) |
| 1756-EN2T | ControlLogix Ethernet module (modern replacement architecture) |
| 1771-KE | Older PLC-5 communication interface module |
Key Advantages
- Enables communication in legacy PLC-5 systems
- Supports dual-network bridging (DH and DH+)
- Reliable long-term industrial performance
- Easy configuration using DIP switches
- Integrates multiple PLC-5 controllers in networked environments
- Stable and proven Rockwell communication architecture
Technical FAQs
What is the main function of the 1785-KA?
It provides communication bridging between Data Highway and Data Highway Plus networks in PLC-5 systems.
Is it still widely used?
Yes, but only in legacy industrial installations.
Does it support Ethernet?
No, it is strictly for DH/DH+ networks.
What PLC systems use it?
Primarily the Allen-Bradley PLC-5 series.
Is it replaceable with modern modules?
Yes, typically replaced with Ethernet-based ControlLogix systems in upgrades.
Conclusion
The Allen-Bradley 1785-KA Communication Adapter Module is a legacy but critical networking component for PLC-5 systems, enabling reliable communication across DH and DH+ industrial networks. While outdated compared to modern Ethernet-based systems, it remains essential for maintaining and supporting existing industrial infrastructure.