What Are the Key Specifications of the Allen Bradley 1769-L24ER-QB1B?

Industrial automation systems require controllers that can handle reliable logic processing, communication, and I/O management without taking excessive panel space. The Allen Bradley 1769-L24ER-QB1B is a CompactLogix 5370 L2 controller designed for applications that need integrated digital I/O and EtherNet/IP communication in a compact controller platform. It combines controller functionality, embedded I/O, communication ports, and power-related features in a single unit.

Understanding the specifications of the Allen Bradley 1769-L24ER-QB1B can help engineers determine whether this controller is suitable for a particular machine, production line, or industrial control application.

750 KB User Memory

One of the most important specifications is its 750 KB memory capacity. This provides space for controller programs, tags, logic, and associated application data. For small and medium-sized automation systems, this memory capacity can provide a practical balance between controller capability and hardware size.

The controller belongs to the CompactLogix 5370 L2 family and is intended for applications where a compact programmable automation controller is preferred over a larger chassis-based solution.

Integrated Digital I/O

The Allen Bradley 1769-L24ER-QB1B includes 16 DC digital inputs and 16 DC digital outputs, allowing many basic field devices to be connected without immediately requiring additional I/O modules. Rockwell Automation specifies the embedded inputs as 24 V DC sink/source inputs, while the outputs are 24 V DC source outputs.

The embedded input section supports an operating range appropriate for 24 V DC industrial signals. The inputs also provide configurable digital filtering, which can help accommodate different field-device signal characteristics.

Having 32 points of embedded digital I/O can reduce the number of additional modules required in applications involving sensors, switches, indicators, solenoids, and other discrete devices.

EtherNet/IP Communication

Communication is another major specification of the controller. The Allen Bradley 1769-L24ER-QB1B provides two EtherNet/IP ports with Device Level Ring (DLR) capability. This makes the controller suitable for industrial Ethernet architectures where devices need to exchange control and diagnostic information.

Rockwell Automation lists support for up to 8 EtherNet/IP connections and 120 TCP connections for this controller. These capabilities can be useful when integrating the PLC with HMIs, drives, remote devices, engineering workstations, and other networked automation equipment.

Expansion Capability

Although the controller already provides integrated I/O, its functionality can be expanded. The 1769-L24ER-QB1B supports up to four 1769 I/O expansion modules. This gives system designers additional flexibility when the built-in 16 inputs and 16 outputs are insufficient for the application.

Additional modules can be selected according to application requirements, such as extra digital points or specialized I/O. This modular approach makes it easier to scale a control system while keeping the controller architecture relatively compact.

Power and USB Connectivity

The controller uses a 24 V DC input embedded power supply, which is appropriate for many industrial control panels using 24 V DC control power. The technical documentation lists approximately 12 W power consumption for the 1769-L24ER-QB1B.

It also includes one USB port, providing a convenient local connection for programming, configuration, or maintenance activities. The combination of USB and EtherNet/IP connectivity gives technicians multiple ways to interact with the controller during commissioning and troubleshooting.

Memory Card and Data Storage

The controller is supplied with a 1 GB SD card and can support an SD card capacity of up to 2 GB.

Removable storage can be particularly useful in industrial environments for controller project management, maintenance, and backup-related tasks. Engineers should nevertheless follow Rockwell Automation’s documentation for the correct procedures for application backup, restoration, and memory-card operations.

Physical Specifications

The Allen Bradley 1769-L24ER-QB1B has a module width of approximately 115 mm (4.53 inches) and weighs about 0.63 kg (1.39 lb).

Its compact physical design makes it appropriate for control panels where available space is limited. The controller can also be mounted using DIN rail or panel mounting arrangements, providing flexibility during cabinet design.

Why Do These Specifications Matter?

The specifications of the Allen Bradley 1769-L24ER-QB1B demonstrate why it can be considered for compact machine-control and industrial automation applications. Its 750 KB memory, integrated 16-point inputs and outputs, dual EtherNet/IP ports, DLR capability, USB connection, SD-card support, and expansion capability combine several important control functions in one controller.

However, selecting a controller should always involve more than comparing memory and I/O counts. Engineers should verify required communication architecture, environmental conditions, I/O requirements, firmware compatibility, network topology, programming requirements, and expansion needs before choosing the controller.

Conclusion

The Allen Bradley 1769-L24ER-QB1B is a CompactLogix 5370 L2 controller designed to provide a combination of processing, digital I/O, networking, and expansion capabilities in a compact package. Its 750 KB memory, 16 DC inputs, 16 DC outputs, two EtherNet/IP ports, DLR capability, support for four expansion modules, 24 V DC power input, USB port, and SD-card support make it a versatile option for many industrial automation systems.

FAQs

1. What type of controller is the 1769-L24ER-QB1B?

The 1769-L24ER-QB1B is an Allen Bradley CompactLogix 5370 L2 controller with integrated digital I/O and EtherNet/IP communication.

2. How much memory does the 1769-L24ER-QB1B have?

It provides 750 KB of controller memory.

3. How many digital I/O points are built into the controller?

It includes 16 DC inputs and 16 DC outputs, providing 32 integrated digital I/O points.

4. Does the 1769-L24ER-QB1B support EtherNet/IP?

Yes. It has two EtherNet/IP ports with Device Level Ring capability and supports up to eight EtherNet/IP connections and 120 TCP connections.

5. Can additional I/O modules be connected to the controller?

Yes. The controller supports up to four 1769 I/O expansion modules, allowing the system to be expanded when additional I/O capacity is required.

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