The Allen-Bradley 1769-L23E-QBFC1B is a self-contained, "all-in-one" packaged controller designed for small to mid-sized automation tasks. By combining the CPU, a 24V DC power supply, and a high-density mix of digital, analog, and high-speed I/O into a single housing, it provides a cost-effective and space-saving solution. It is particularly well-suited for standalone machines, process skids, and distributed control systems that require EtherNet/IP connectivity and integrated analog processing without the complexity of a large modular rack.
Technical Specifications
Manufacturer:Allen-Bradley (Rockwell Automation)
Series:CompactLogix (Packaged Controller)
Part Number:1769-L23E-QBFC1B
User Memory:512 KB (Battery-backed)
Digital I/O:16 × 24V DC Inputs; 16 × 24V DC Outputs
Analog I/O:4 Differential/Single-ended Inputs; 2 Single-ended Outputs
High-Speed Counters (HSC):4 Channels
Communication Ports:1x EtherNet/IP (10/100 Mbps); 1x RS-232 (DF1/ASCII)
Expansion Capacity:Supports up to 2 additional 1769 modules
Power Supply:24V DC Input (Integrated)
Mounting:DIN Rail or Panel Mount
Battery:1769-BA (Replacement lithium battery for data retention)
Key Features
Integrated Multi-Function I/O:The "QBFC" designation highlights its rich onboard I/O, including high-speed counters for motion feedback and analog channels for temperature or pressure monitoring.
Seamless Networking:Features an embedded RJ45 EtherNet/IP port for high-speed communication with HMIs, SCADA systems, and other controllers using CIP (Common Industrial Protocol).
Legacy Connectivity:The isolated RS-232 port supports DF1 and ASCII protocols, allowing for easy integration of legacy serial devices like barcode scanners and modems.
Compact Footprint:Ideal for mounting in shallow enclosures or limited-space control panels where a standard modular PLC would be too large.
Battery-Backed Data:Unlike the newer 5370 series which uses SD cards, this L23E model uses a 1769-BA battery to maintain the 512 KB of volatile user RAM during power cycles.
