The Allen-Bradley 1769-L24ER-QB1B is a powerful and versatile Programmable Automation Controller (PAC) from the trusted CompactLogix 5370 L2 family. This packaged controller combines a 24V DC power supply, a 750KB memory, and 32 embedded I/O points into a single, compact unit. Furthermore, it includes dual Ethernet ports that support Device Level Ring (DLR) topology for enhanced network reliability. Therefore, its design makes it a perfect solution for original equipment manufacturers (OEMs) and end users who need a cost-effective controller for material handling, packaging, and machine control applications.
The 1769-L24ER-QB1B offers a balanced mix of digital I/O. Specifically, it provides (16) 24V DC sinking/sourcing digital inputs and (16) 24V DC sourcing digital outputs. Meanwhile, this embedded I/O supports a wide operating voltage range, from 10 to 28.8V DC for inputs and 20.4 to 26.4V DC for outputs. Moreover, its memory architecture includes 750KB of volatile user memory, which is maintained without a battery. For non-volatile storage, the controller ships with a 1784-SD1 1GB Secure Digital card, allowing you to back up programs and data securely.
Connectivity is a standout feature of this model. For instance, it features (2) Ethernet/IP ports that support 10/100 Mbps speeds. These ports enable linear, star, or ring (DLR) topologies, with DLR offering automatic data re-routing if a cable fails. Additionally, it has a 1 RS232 serial port that supports ASCII, DH485, and DF1 protocols, making it compatible with older legacy devices. A USB port is also available for quick initial configuration and firmware updates. Besides these, the controller also supports motion control, managing up to 2 axes over Ethernet.
This CompactLogix controller is built to handle complex logic. First, it supports up to 32 tasks, with a maximum of 100 programs per task, giving you flexibility in organizing your control code. Next, programming is supported via standard IEC 61131-3 languages, including Relay Ladder, Structured Text, Function Block, and Sequential Function Chart. As a result, this versatility allows you to choose the best language for each part of your application, ensuring efficient code development.
The 1769-L24ER-QB1B operates on a nominal 24V DC isolated power supply. Specifically, its typical current draws are 1.54A at 5V DC and 0.95A at 24V DC. For the digital outputs, the current per point is rated at 0.83A at 40 °C and 0.5A at 60 °C. Similarly, the total module current is 6.64A at 40 °C and 4A at 60 °C.
Its compact dimensions of 4.53 x 4.13 x 4.65 inches (115 x 105 x 118 mm) allow it to fit into tight control panels. Furthermore, the unit is designed for DIN rail mounting, which simplifies installation and maintenance. For wiring, it accepts solid copper wire from 22-14 AWG and stranded wire from 22-16 AWG.
Installing the 1769-L24ER-QB1B is straightforward. For example, you can snap it directly onto a standard DIN rail without needing a backplate. For reliable operation, ensure the environment is clean and within specified temperature ranges (0 °C to 60 °C). Moreover, you can expand the controller by adding up to (4) 1769 Compact I/O modules directly to its side. Meanwhile, you can integrate the system into a new or existing ControlLogix or CompactLogix network. Use the USB port for the initial program download, and then leverage the Ethernet ports for ongoing communication and data exchange.
(1) Allen-Bradley 1769-L24ER-QB1B CompactLogix Controller
(1) Removable Terminal Block (RTB) – Part Number 1769-RTBN18
(1) 1784-SD1 1GB Secure Digital Memory Card
Documentation and CD (where applicable)
Note: All orders are shipped using reliable courier services, including FedEx, UPS, and DHL.
1. What is the memory size of the 1769-L24ER-QB1B?
This controller comes with a 750KB volatile user memory. Additionally, it includes a 1784-SD1 1GB non-volatile Secure Digital card for program storage and backup.
2. How many I/O modules can be connected to this unit?
The 1769-L24ER-QB1B supports up to (4) local 1769 Compact I/O modules directly attached to it. Therefore, it expands its built-in I/O capabilities for larger applications.
3. Does this controller support motion control?
Yes, it supports basic motion control. Specifically, the 1769-L24ER-QB1B can manage up to 2 axes of motion over its integrated Ethernet network.
4. What communication protocols are supported?
This model supports a comprehensive range of protocols. For instance, it features Ethernet/IP on its dual ports. Likewise, it supports DF1, DH485, and ASCII protocols via its RS232 serial port.
5. How does the DLR feature on this controller work?
The Device Level Ring (DLR) feature allows the controller to maintain communication if one network cable fails. As a result, the data is automatically re-routed, providing fault tolerance and reducing downtime.
| Brand Name | |
| Model No. | 1769-L24ER-QB1B |
| Product Type | Programmable Automation Controller |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
