Allen-Bradley 1769-L24ER-QBFC1B CompactLogix 5370 L2 PAC Controller

Technical Specifications Breakdown

Key parameters for the 1769-L24ER-QBFC1B are listed below for quick reference:

Compact Control for Demanding Small-Scale Applications

This CompactLogix 5370 L2 programmable automation controller (PAC) packs the CPU performance of larger L3 controllers into a smaller, cost-effective package.

Real-World Applications That Benefit from Integrated I/O

Engineers often face the challenge of controlling a machine with both discrete and analog signals while keeping panel space small. The 1769-L24ER-QBFC1B solves this by embedding 16 digital inputs, 16 digital outputs, 4 analog inputs, and 2 analog outputs directly on the controller. For a hoisting and crane application, the high-speed counter inputs (4) can track encoder feedback for precise positioning, while the analog outputs drive variable-frequency drives for smooth acceleration. In packaging lines, the controller handles up to 32 tasks and 100 programs per task, allowing separate logic for each machine zone without extra hardware.

Installation and Setup Guidance

Mount the controller on a DIN rail using the integrated clip. Ensure at least 50 mm (2 inches) of clearance around the module for proper airflow. Connect 24 VDC power to the embedded supply terminals. For IP address assignment, use the BOOTP-DHCP utility by entering the controller's MAC address. Wire digital inputs as sinking or sourcing per your sensor requirements; use copper wire rated for 90 degrees Celsius with solid 22 to 14 AWG or stranded 22 to 16 AWG. The included 1769-RTBN18 terminal block simplifies field wiring.

Maintenance and Reliability

The open-type enclosure allows visual inspection of status LEDs. Periodically check that all connections are tight and that ambient temperature stays within the operating range. The non-volatile memory (1 GB SD card shipped with the controller) retains your program even without power. For extended memory needs, order the optional 1784-SD2 card (2 GB). No special cleaning or disassembly is required—just keep the enclosure free of dust and debris.

Compatibility and Integration

This controller communicates over dual EtherNet/IP ports supporting Device Level Ring (DLR) topology for network redundancy. It also supports RS232 (DF1, DH485, ASCII) for legacy device connectivity. The USB port enables local programming. The controller can expand with up to four 1769-series I/O modules, making it easy to add more points without changing the processor.

Selection Guide and Purchasing Advice

When selecting a PAC for small to medium control needs, the 1769-L24ER-QBFC1B offers a balanced mix of processing power and onboard I/O. It is available now at AutoDCSTech. Please verify current lifecycle status and availability with AutoDCSTech before ordering. Our team can help confirm that this model matches your application requirements.