Allen-Bradley 2080-L50E-24QWB Micro850 EtherNet/IP Controller
The Allen-Bradley 2080-L50E-24QWB is a 24-point Micro850 EtherNet/IP programmable controller featuring 14 digital inputs rated for 24V DC or AC, and 10 relay output points. This QWB configuration provides distinct advantages for mixed-voltage and AC load switching applications where transistor outputs would require additional interface relays.
Controller Overview
This Micro850 controller occupies the mid-range position in the Micro800 family, featuring a built-in 10/100Base-T Ethernet port, non-isolated RS232/485 serial port, and USB programming port. It supports up to four 2085-series expansion I/O modules and includes three plug-in slots for specialized function modules, making it ideal for applications requiring future expansion capabilities.
Key Specifications
| Parameter |
Value |
| Digital Inputs |
14 × 24V DC/AC |
| Digital Outputs |
10 × Relay |
| Power Supply |
24V DC |
| HSC Channels |
Up to 4 |
| Program Memory |
10K program steps |
| Data Memory |
20 KB |
| Ethernet |
10/100Base-T (EtherNet/IP, Modbus TCP/IP) |
| Serial Port |
RS232/485 (non-isolated) |
| USB |
Programming port |
| Plug-In Slots |
3 |
| Expansion I/O |
Up to 4 modules |
| Max Total I/O |
Up to 132 digital points (with expansion) |
Relay Output Advantages
The 10 relay outputs provide potential-free contacts that are electrically isolated from the controller's supply circuit. This allows switching of AC or DC loads without concern for polarity or common-return sharing, making them ideal for applications with mixed voltage requirements or inductive pilot duty loads.
Dual AC/DC Input Capability
The 14 inputs accept both 24V DC and AC directly, eliminating the need for additional signal conditioning relays in retrofit applications with existing AC field wiring. Four inputs are configurable as high-speed counter channels for encoder feedback, flow meter pulse inputs, and frequency measurement applications.
Network Connectivity
The embedded Ethernet port supports both EtherNet/IP for Allen-Bradley ecosystem integration and Modbus TCP/IP for communication with third-party devices. The controller can communicate with up to 8 Ethernet nodes simultaneously, covering typical standalone machine or small production cell requirements.
Expansion Capabilities
The controller grows through three plug-in slots for specialized function modules and four expansion module slots for bulk I/O point addition. This dual-expansion architecture supports up to 132 digital I/O points while maintaining flexibility for analog, temperature, and motion control applications.
Programming & Software
Programming is accomplished using Rockwell Automation's Connected Components Workbench (CCW) software, which supports all IEC 61131-3 languages including ladder diagram, function block diagram, structured text, and sequential function chart without additional licensing requirements.
Frequently Asked Questions
What is the difference between the 2080-L50E-24QWB and the 2080-L50E-24QBB?
Both controllers are identical in communications, expansion, and processing capabilities. The QWB features 10 relay outputs for AC/DC switching, while the QBB has 10 transistor sinking outputs for 24V DC loads only. Choose QWB for mixed-voltage applications and QBB for faster DC switching.
How many total I/O points can the controller support with expansion?
Starting from 24 onboard points, adding four 2085-series 32-point expansion modules reaches approximately 132 digital I/O points. The three plug-in slots add specialized function modules without consuming expansion slots.
What software is required for programming?
Connected Components Workbench (CCW) is the free Rockwell Automation software that supports all IEC 61131-3 programming languages and includes simulation mode for offline testing.
Can the controller communicate with Modbus devices?
Yes, the Ethernet port supports Modbus TCP/IP and the RS232/485 serial port supports Modbus RTU, making it suitable for applications requiring communication with legacy Modbus field devices.
What does the 14V lower input threshold mean in practice?
The 14V minimum threshold ensures reliable input recognition in systems with voltage sag or long cable runs. A nominal 24V supply that sags to 18V will still produce a valid logic 1, providing comfortable margin for real-world supply conditions.
![2080-L50E-24QWB New AB Micro850 24 I/O EtherNet Controller
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