Product Overview
The Allen-Bradley 1769-L23E-QBFC1B CompactLogix Packaged Controller is a compact, high-performance programmable logic controller (PLC) designed for small to medium industrial applications. This all-in-one controller integrates a power supply, embedded I/O, and communication ports in a single unit, simplifying installation and reducing panel space. The 1769-L23E-QBFC1B is part of the CompactLogix 5370 L2 family and is built to deliver reliable, real-time control for machines and processes.
With 16 digital inputs, 16 digital outputs, 4 analog inputs, 2 analog outputs, and 4 high-speed counters, this controller provides a complete control solution out of the box. It also offers one Ethernet port and one RS232 serial port, enabling seamless integration into modern industrial networks. The 1769-L23E-QBFC1B is an ideal choice for OEMs and system integrators seeking a cost-effective yet powerful PLC for applications such as packaging, material handling, and machine automation.
Technical Specifications
The table below lists the key specifications for the Allen-Bradley 1769-L23E-QBFC1B. All values are directly from the manufacturer's data.
| Specification |
Value |
| Brand |
Allen-Bradley / Rockwell Automation |
| Series |
CompactLogix |
| Type of Component |
Programmable Logic Controller |
| Product Type |
Programmable Automation Controller (PAC) |
| Number of Digital Inputs |
16 |
| Number of Digital Outputs |
16 |
| Number of Analog Inputs |
4 |
| Number of Analog Outputs |
2 |
| User Memory |
512 KB |
| Non-volatile Memory |
Not supported |
| High-speed Counter |
Yes (4 channels) |
| Built-in Communication |
1 Serial port; 1 Ethernet port |
| EtherNet/IP Compatibility |
Yes, via built-in RJ45 socket |
| Supported Protocols |
Serial: DF1, ASCII; Ethernet: TCP/IP, CIP |
| DeviceNet Compatibility |
Yes (requires 1769-SDN module) |
| Ethernet Data Rate |
10/100 Mbps |
| No. of Expansion Modules |
Up to 2 (1769 I/O modules) |
| No. of I/O Banks Supported |
None |
| Power Supply |
24 VDC |
| UPC |
10612598350756 |
The 1769-L23E-QBFC1B provides 512 KB of volatile user memory, backed by an integrated 1769-BA battery to maintain data during power loss. The controller supports up to two 1769 Compact I/O expansion modules, allowing you to scale I/O as needed. Its Ethernet port supports 10/100 Mbps data rates and is EtherNet/IP compatible, while the RS232 port supports DF1 and ASCII protocols for point-to-point communication.
Key Features & Benefits
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All-in-One Design: Integrated power supply, embedded I/O, and communication ports reduce panel space and wiring.
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Versatile I/O: 16 digital inputs, 16 digital outputs, 4 analog inputs, 2 analog outputs, and 4 high-speed counters provide flexibility for various applications.
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EtherNet/IP Connectivity: Built-in Ethernet port enables fast, reliable communication with HMIs, SCADA systems, and other industrial devices.
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RS232 Serial Port: Supports DF1 and ASCII protocols for point-to-point communication with legacy devices.
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Expandable: Add up to two 1769 Compact I/O modules to increase I/O capacity.
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Battery-Backed Memory: 512 KB user memory retained with integrated 1769-BA battery.
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Compact Footprint: Requires only 50 mm (1.97 in.) clearance for proper ventilation, ideal for space-constrained enclosures.
Industry Applications
The Allen-Bradley 1769-L23E-QBFC1B is engineered for small to medium machines and processes. Typical applications include:
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Packaging Machinery: Control of conveyors, labeling, and filling operations using the embedded I/O and high-speed counters for precise position tracking.
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Material Handling: Manage sorting systems, palletizers, and transfer stations with the 16 digital inputs/outputs and Ethernet/IP connectivity.
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Machine Automation: Ideal for OEMs building custom machines that require a compact, reliable PLC with built-in communication.
In a packaging line, for example, the 1769-L23E-QBFC1B can handle high-speed counting via its four high-speed counters, while the analog inputs monitor temperature or pressure sensors, and the Ethernet port communicates with a central SCADA system.
Installation & Setup Guidance
Mount the 1769-L23E-QBFC1B on a standard DIN rail or directly to a panel using the provided mounting tabs. Ensure at least 50 mm (1.97 in.) of clearance around the controller for proper airflow and natural ventilation. For serial communication, use the recommended 1756-CP3 cable. Assign the controller's IP address using the BOOTP-DHCP tool or by downloading the initial configuration through the serial port.
When adding expansion modules, install them to the right side of the controller and terminate the local I/O bus with the provided end cap. The controller supports up to two 1769 Compact I/O modules. For EtherNet/IP communication, use standard Cat5 or Cat6 cables with RJ45 connectors.
Maintenance & Reliability
The 1769-L23E-QBFC1B is designed for long-term reliability in industrial environments. Its battery-backed RAM ensures data retention during power interruptions. The integrated 1769-BA battery should be replaced only while the controller is powered to avoid data loss. Regularly inspect the controller for dust accumulation and ensure ventilation paths remain clear. The LED status indicators on the front panel allow quick visual checks of output channel status, operating mode, and battery health.
Compatibility & Integration
The 1769-L23E-QBFC1B integrates seamlessly with Rockwell Automation's ecosystem. It supports EtherNet/IP, allowing connection to HMIs, SCADA, DCS, and data collection platforms. The RS232 port supports DF1 and ASCII protocols, enabling communication with barcode readers and legacy devices. For DeviceNet networks, an additional 1769-SDN scanner module is required. Expansion modules from the 1769 Compact I/O series can be added to increase I/O capacity.
Selection Guide & Purchasing Advice
Before purchasing the 1769-L23E-QBFC1B, verify that your application's I/O count, memory, and communication requirements align with the specifications listed above. Ensure you have the necessary 24 VDC power supply and appropriate communication cables. If you need DeviceNet connectivity, order the 1769-SDN module separately. For a reliable source of genuine Allen-Bradley parts, consider PLC Source PRO, which offers a wide range of industrial automation spares with fast shipping.