Allen-Bradley 1771-ALX Local I/O Adapter Module
The 1771-ALX is a local I/O adapter module designed by Allen-Bradley for Bulletin 1771 and PLC-5 control systems. It coordinates high-speed communication between the processor chassis and local input or output modules. This adapter allows maintenance teams to disconnect an individual rack or cable link without shutting down the entire automation process.
Communication and Architecture
This module acts as a central communication node within the Bulletin 1771 backplane architecture. It supports up to 16 local I/O adapters connected via standard cable assemblies. Front-panel status indicators provide real-time feedback for active links, adapter faults, and rack communications.
Configuration and Installation
Module configuration requires setting internal address switches and configuration plugs to match your chassis requirements. It mounts securely inside the leftmost slot of a compatible I/O chassis. Proper termination plug installation on the final adapter ensures signal integrity across the local bus.
| Parameter | Specification |
|---|---|
| Model | 1771-ALX |
| Brand | Allen-Bradley |
| Product Type | Local I/O Adapter Module |
| Backplane Current | 1.2 A at 5 VDC |
| System Compatibility | PLC-5 / Bulletin 1771 Systems |
| Mounting Type | Panel / Rack Mount |
| Weight | 1.20 lbs |
Frequently Asked Questions
Q: What is the primary function of the Allen-Bradley 1771-ALX?A: It links PLC-5 processors with local Bulletin 1771 I/O chassis to manage data exchange and support modular rack disconnections.
Q: How many local I/O adapters can you run on a single bus?A: A configured system supports up to 16 local I/O adapters connected within a maximum cable length of 30 meters.
Allen-Bradley 1771-ALX Local I/O Adapter Module
Allen-Bradley 1771-ALX Local I/O Adapter Module
The 1771-ALX is a local I/O adapter module designed by Allen-Bradley for Bulletin 1771 and PLC-5 control systems. It coordinates high-speed communication between the processor chassis and local input or output modules. This adapter allows maintenance teams to disconnect an individual rack or cable link without shutting down the entire automation process.
Communication and Architecture
This module acts as a central communication node within the Bulletin 1771 backplane architecture. It supports up to 16 local I/O adapters connected via standard cable assemblies. Front-panel status indicators provide real-time feedback for active links, adapter faults, and rack communications.
Configuration and Installation
Module configuration requires setting internal address switches and configuration plugs to match your chassis requirements. It mounts securely inside the leftmost slot of a compatible I/O chassis. Proper termination plug installation on the final adapter ensures signal integrity across the local bus.
| Parameter | Specification |
|---|---|
| Model | 1771-ALX |
| Brand | Allen-Bradley |
| Product Type | Local I/O Adapter Module |
| Backplane Current | 1.2 A at 5 VDC |
| System Compatibility | PLC-5 / Bulletin 1771 Systems |
| Mounting Type | Panel / Rack Mount |
| Weight | 1.20 lbs |
Frequently Asked Questions
Q: What is the primary function of the Allen-Bradley 1771-ALX?A: It links PLC-5 processors with local Bulletin 1771 I/O chassis to manage data exchange and support modular rack disconnections.
Q: How many local I/O adapters can you run on a single bus?A: A configured system supports up to 16 local I/O adapters connected within a maximum cable length of 30 meters.
