The 1769-L24ER-QBFC1B from Allen‑Bradley is a powerful yet compact member of the CompactLogix 5370 L2 controller family. This programmable automation controller (PAC) combines a robust 750KB of user memory with a versatile set of embedded I/O, including digital, analog, and high-speed counter capabilities. Its dual EtherNet/IP ports support device-level ring (DLR) topology, which enhances network reliability. Meanwhile, the integrated RS-232 and USB ports provide flexible connectivity for programming and diagnostics. Engineers often choose this controller for applications like hoisting, cranes, indexing tables, and packaging machinery. Moreover, its small footprint allows installation in tight control cabinets without sacrificing performance.
The 1769-L24ER-QBFC1B runs on a high-performance CPU that handles up to 32 controller tasks. Each task can support up to 100 individual programs, giving you substantial flexibility for complex logic sequences. It offers 750KB of user memory for your application code and data. Additionally, the controller ships with a 1GB Secure Digital (SD) card for non-volatile program storage. You may also order a 2GB SD card separately if you need extra space for recipes or data logging.
This controller includes sixteen (16) sinking/sourcing 24V DC digital input points. These inputs accept a nominal voltage of 24V DC and operate reliably across a range of 10 to 28.8V DC. For outputs, it provides sixteen (16) sinking 24V DC digital output channels. Each output can deliver up to 0.83A per point at 40 °C, with derating to 0.58A at 55 °C and 0.5A at 60 °C. The module's total output current capacity reaches 6.64A at 40 °C, 4.64A at 55 °C, and 4A at 60 °C. Furthermore, the maximum on-state voltage drop is only 1V DC at 1A, which ensures efficient power delivery to your field devices.
For precision measurement, the 1769-L24ER-QBFC1B offers four (4) universal analog input channels that accept voltage (±50 mV, ±100 mV, 0-5V, 1-5V, 0-10V, ±10V), current (0-20mA, 4-20mA), resistance (0-150Ω, 0-500Ω, 0-1000Ω, 0-3000Ω), and various thermocouple and RTD types. It also includes two (2) single-ended analog output channels supporting voltage (0-5V, 1-5V, 0-10V, ±10V) and current (0-20mA, 4-20mA) signals. In addition, the controller features four (4) high-speed counter (HSC) inputs with a switching frequency up to 250 kHz, alongside four (4) high-speed outputs that deliver a 5-30V DC output range with a turn-on time of 400 µs and turn-off time of 200 µs.
Connectivity is a strong suit of this processor. It provides two (2) EtherNet/IP ports that support DLR and allow up to 256 EtherNet/IP connections and 120 TCP connections. These ports enable seamless integration with HMIs, drives, and other networked devices. Additionally, the controller includes one (1) RS-232 port and one (1) USB port for local programming and troubleshooting. Supported protocols include ASCII, DH485, DF1, and standard Ethernet. Therefore, you can easily communicate with legacy equipment or modern automation systems alike.
The 1769-L24ER-QBFC1B runs on a 24V DC embedded power supply. It draws 1A at 5V DC and 0.8A at 24V DC from the system backplane. Its operating voltage range is 10 to 28.8V DC at 40 °C, 10 to 27V DC at 55 °C, and 10 to 26.4V DC at 60 °C. The maximum off-state voltage is 5V DC, while the off-state current stays below 1.5mA. For the outputs, the nominal output voltage is 24V DC with an allowable range of 20.4 to 26.4V DC. The continuous isolation voltage is rated at 30V DC, ensuring safe operation in industrial environments.
This controller is designed for DIN rail mounting, which simplifies installation and reduces panel space requirements. You must maintain a clearance of at least 50 mm (2 inches) from wireways, electrical components, and other panel hardware. Proper spacing ensures adequate airflow and prevents overheating. The unit operates reliably at temperatures up to 60 °C with appropriate derating. Its open-type enclosure suits installation within a larger industrial control panel. Furthermore, the controller meets standard industrial vibration and shock specifications, making it durable for factory floor conditions.
When installing the 1769-L24ER-QBFC1B, first secure it onto a standard DIN rail inside your control cabinet. Ensure that the surrounding components do not obstruct ventilation. Then, connect the 24V DC power supply to the embedded power terminals, observing correct polarity. For network communication, use shielded Ethernet cables and route them away from high-voltage power lines to minimize interference. If you need to expand the system, this controller supports up to four (4) additional 1769-series modules connected via the side expansion bus. After wiring all I/O points, apply power and configure the IP address using the BOOTP-DHCP utility or the controller's built-in web interface. Finally, download your application program via USB, RS-232, or Ethernet to complete the setup.
One (1) Allen-Bradley 1769-L24ER-QBFC1B CompactLogix 5370 L2 controller module
One (1) 1GB SD memory card (1784-SD1) for non-volatile storage
One (1) removable terminal block (1769-RTBN18) for I/O wiring
DIN rail mounting clip (pre-installed)
Quick start guide (printed)
Note: Cables, software, and additional mounting hardware are sold separately.
All orders are shipped via FedEx, UPS, or DHL with standard tracking services. We package the controller in anti-static materials to prevent electrostatic discharge damage during transit. Please allow 1-2 business days for order processing. Expedited shipping options are available upon request.
1. What is the user memory size of the 1769-L24ER-QBFC1B?
The controller provides 750KB of user memory for application code and data. Additionally, it includes a 1GB SD card for extended storage.
2. Can I expand this controller with additional I/O modules?
Yes, the 1769-L24ER-QBFC1B supports up to four (4) additional 1769-series expansion modules connected via the side bus.
3. Does this controller support motion control applications?
Absolutely. It handles up to 2 axes of motion control over EtherNet/IP and includes high-speed counter inputs for encoder feedback.
4. What programming languages does it support?
The controller supports Relay Ladder, Structured Text, Function Block Diagram, and Sequential Function Chart (SFC) per IEC 61131-3 standards.
5. How do I set the IP address for the Ethernet ports?
You can assign the IP address using the BOOTP-DHCP utility or the controller's built-in web configuration interface. The MAC address label on the unit helps with initial discovery.
| Brand Name | |
| Model No. | 1769-L24ER-QBFC1B |
| Product Type | Programmable Automation Controller |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
