Introduction

The Allen-Bradley 2080-L50E-48QBB Micro850 Programmable Controller is a 48-point programmable logic controller from Rockwell Automation's Micro850 family. It is designed for industrial machinery and standalone automation systems that need integrated digital I/O, Ethernet connectivity, and transistor-based output control.

The controller provides 28 digital inputs compatible with 24V DC or 24V AC signals, together with 20 sourcing transistor outputs rated for 24V DC applications. This configuration is particularly useful for equipment using DC sensors and frequently switched electronic control loads. Compared with relay-output versions, its solid-state outputs are better suited to applications requiring faster and more frequent switching, provided the connected loads meet the specified ratings.

Communication options include embedded Ethernet, RS-232, and RS-485, while the USB port provides a programming connection. The controller also supports up to six high-speed counter channels and three pulse-train output functions, offering additional flexibility for selected counting and pulse-control applications.

The Micro850 architecture supports five plug-in slots and compatible Micro800 expansion I/O modules. Engineers can use Connected Components Workbench (CCW) to program, configure, and maintain the controller.

For machine builders and maintenance teams, the 2080-L50E-48QBB offers an integrated control platform for compact production equipment, material-handling systems, and automated machinery requiring 24V AC/DC inputs and 24V DC sourcing outputs.

Technical Specifications

Parameter	Specification
Brand	Allen-Bradley
Model	2080-L50E-48QBB
Product Series	Micro850
Product Type	Programmable Controller
Total Embedded I/O	48 points
Digital Inputs	28 points
Input Signal Type	24V DC / 24V AC
Digital Outputs	20 points
Output Type	24V DC sourcing transistor
Output Current Rating	1 A per point at 30°C; 0.3 A per point at 65°C
Controller Power Supply	24V DC
Power Supply Range	21.4–26.4V DC
Ethernet	Embedded Ethernet port
Serial Communication	RS-232 / RS-485
Programming Interface	USB
High-Speed Counter Support	Up to 6 channels
Pulse-Train Output Support	Up to 3 functions
Plug-in Slots	5
Programming Software	Connected Components Workbench (CCW)
Lifecycle Status	Active
Dimensions	238 × 80 × 90 mm
Weight	0.725 kg / 1.60 lb

Recommended Related Models

These models offer alternative Micro850 I/O configurations and related expansion capabilities. Their output technologies and signal requirements should be compared before selection.

Model	Product Description
2080-L50E-48QVB	Micro850 48-Point Controller with 24V DC Sinking Outputs
2080-L50E-48QWB	Micro850 48-Point Controller with Relay Outputs
2080-L50E-48AWB	Micro850 48-Point Controller with 120V AC Inputs and Relay Outputs
2080-L50E-24QBB	Micro850 24-Point Controller with Sourcing Outputs
2080-L50E-24QVB	Micro850 24-Point Controller with Sinking Outputs
2080-L50E-24QWB	Micro850 24-Point Controller with Relay Outputs
2080-IF4	Micro800 Analog Input Plug-in Module
2080-OF2	Micro800 Analog Output Plug-in Module

Popular Related Models

2080-L50E-48QBB – Micro850 48-Point Controller with Sourcing Outputs
2080-L50E-48QVB – Micro850 Controller with Sinking Outputs
2080-L50E-48QWB – Micro850 Controller with Relay Outputs
2080-L50E-48AWB – Micro850 Controller with 120V AC Inputs
2080-L50E-24QBB – Micro850 24-Point Controller with Sourcing Outputs
2080-L50E-24QVB – Micro850 24-Point Controller with Sinking Outputs
2080-IF4 – Micro800 Analog Input Plug-in Module
2080-OF2 – Micro800 Analog Output Plug-in Module

Applications

The Allen-Bradley 2080-L50E-48QBB Micro850 Programmable Controller is designed for compact industrial automation systems that require integrated digital I/O, Ethernet communication, and 24V DC transistor outputs. With a 48-point I/O configuration, it can serve as the main controller for machinery and standalone equipment.

Typical applications include:

Packaging machinery: Coordinating photoelectric sensors, product detection, actuators, and automated sequences.
Conveyor systems: Managing position signals, control relays, and compatible DC output devices.
Assembly equipment: Processing sensor inputs and controlling solenoid valves and other 24V DC loads.
Material handling: Coordinating equipment movements and discrete control signals.
OEM machine control: Providing integrated PLC functionality for compact production machines.
Industrial equipment upgrades: Replacing older controllers where the I/O configuration and electrical characteristics are compatible.

Advantages

1. Integrated 48-Point I/O

The controller combines 28 digital inputs and 20 digital outputs, providing substantial onboard I/O capacity without requiring a separate basic I/O rack.

2. 24V DC Sourcing Transistor Outputs

The 20 sourcing outputs are designed for compatible 24V DC loads. Their transistor-based switching is suitable for applications requiring frequent discrete output operations.

3. Flexible Digital Input Configuration

The embedded digital inputs support 24V DC signals, making the controller suitable for common industrial sensors and DC control circuits.

4. Embedded Ethernet Connectivity

The Ethernet interface supports communication with compatible engineering workstations, operator interfaces, and other networked automation devices.

5. Serial Communication Support

RS-232 and RS-485 interfaces provide additional options for connecting compatible serial equipment.

6. High-Speed Control Functions

The Micro850 platform supports high-speed counter and pulse-related functions on applicable hardware configurations. The exact capabilities should be checked against the 48QBB model's specifications before application design.

7. Expandable Micro800 Architecture

Five plug-in slots support compatible accessories and functional modules. Additional Micro800 expansion I/O can be used when the application requires more signals.

8. Integrated Engineering Environment

Connected Components Workbench (CCW) provides programming, configuration, and troubleshooting functions for Micro850 controllers.

Technical FAQs

Q1: How many I/O points does the 2080-L50E-48QBB provide?

It provides 48 embedded I/O points, consisting of 28 digital inputs and 20 digital outputs.

Q2: What input signals are supported?

The 28 digital inputs support 24V DC and 24V AC signals. The input circuit is designed for sinking or sourcing field-device configurations according to the wiring requirements.

Q3: What type of outputs does this controller use?

It has 20 sourcing transistor outputs rated for 24V DC. These are solid-state outputs rather than mechanical relay contacts.

Q4: What is the output current rating?

The outputs are rated at up to 1 A per point at an ambient temperature of 30°C, with a reduced rating of 0.3 A per point at 65°C. Check the controller's total output loading and thermal derating requirements when designing the circuit.

Q5: What power supply does the controller require?

It requires a nominal 24V DC supply, with a specified operating range of approximately 21.4–26.4V DC.

Q6: Does the 2080-L50E-48QBB support high-speed counters?

Yes. The controller supports up to six high-speed counter channels. The available counting modes depend on the input configuration and application requirements.

Q7: Can this controller generate pulse-train outputs?

Yes. The BB output configuration supports up to three pulse-train output functions. Confirm the required pulse frequency, wiring, and connected device specifications before implementation.

Q8: Which communication interfaces are available?

The controller includes an embedded Ethernet port, RS-232, RS-485, and a USB programming interface. These support programming and communication with compatible industrial equipment.

Q9: Can the controller be expanded with additional modules?

Yes. It provides five plug-in slots and supports compatible Micro800 expansion I/O modules. The complete system configuration must remain within the controller's supported expansion limits.

Q10: What should be checked when replacing another Micro850 controller with this model?

Check the input voltage type, output technology, output current requirements, wiring arrangement, firmware, communication settings, and application program. In particular, the 48QBB's sourcing transistor outputs are not interchangeable with relay outputs or sinking transistor outputs without reviewing the field circuit design.

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