Product Overview

The Allen‑Bradley 1769‑L23E‑QBFC1B is a CompactLogix packaged controller. Rockwell Automation designs this unit for small to mid‑size applications. It controls industrial machines and processes with high reliability. This controller comes with embedded I/O channels ready for use. You get sixteen (16) 24 VDC discrete inputs and sixteen (16) 24 VDC discrete outputs. The unit also includes four (4) analog inputs and two (2) analog outputs. For high‑speed counting tasks, it provides four (4) high‑speed counters (HSCs). The 1769‑L23E‑QBFC1B supports up to two additional 1769 Compact I/O modules. This makes system expansion simple and flexible.

Technical Specifications

Memory & Processing

• User Memory: 512 KB (non‑expandable)

• Memory Type: Battery‑backed RAM (uses 1769‑BA battery)

• Non‑volatile Memory: Not supported

Embedded I/O Channels

• Discrete Inputs: 16 points, 24 VDC sinking

• Discrete Outputs: 16 points, 24 VDC sourcing

• Analog Inputs: 4 channels (differential or single‑ended)

• Analog Outputs: 2 channels (single‑ended)

• High‑Speed Counters: 4 channels (similar to 1769‑HSC module)

Communication Ports

• Ethernet Port: One RJ45 socket, 10/100 Mbps

• Serial Port: One RS232, 9‑pin isolated, up to 38.4 Kbps

• Ethernet Protocols: TCP/IP, CIP (EtherNet/IP compatible)

• Serial Protocols: DF1 (full/half duplex, master/slave), ASCII, DH485

Expansion & Connectivity

• Max I/O Expansion Modules: Two (2) units of 1769 Compact I/O

• DeviceNet Support: Yes (requires 1769‑SDN scanner module)

• Ethernet Connections: 8 TCP connections, 32 CIP connections

• Virtual Axis Limit: 4 axes

Environmental & Mechanical

• Power Supply: 24 VDC external

• Mounting: DIN rail or panel mounting (with built‑in tabs)

• Clearance Required: 50 mm (1.97 inches) for airflow

• Serial Cable Recommended: 1756‑CP3

• UPC: 10612598350756

Installation Guidelines

Follow these steps to mount the Allen‑Bradley 1769‑L23E‑QBFC1B safely.

• Disconnect all power sources before starting the installation. This protects the controller and your safety.

• Mount the controller on DIN rail or use the integrated panel tabs. Fasten screws securely for panel mounting.

• Maintain 50 mm clearance above and below the unit. This ensures proper natural ventilation.

• Connect the serial port using a 1756‑CP3 communication cable only. This provides reliable point‑to‑point wiring.

• Assign the IP address via the BOOTP‑DHCP tool. You can also download the initial config through the serial port.

• Insert the 1769‑BA battery to back up user memory. Replace the battery only while the controller remains powered.

• Add up to two expansion modules on the right side. Terminate the I/O bus with the included end cap.

• Avoid corrosive gases, vapors, or dust in the installation environment. This prevents long‑term damage.

Note: The 1769‑L23E‑QBFC1B does not support non‑volatile memory. Always keep a valid battery installed.

Package List

When you receive your Allen‑Bradley 1769‑L23E‑QBFC1B, the box includes the following items.

• One 1769‑L23E‑QBFC1B CompactLogix packaged controller

• One I/O bus end cap (for local bus termination)

• One panel mounting tab set (screws and brackets)

• One quick start installation guide

• One antistatic protective bag

Notice: The package does not include the 1769‑BA battery, communication cables, or expansion I/O modules. Please order those separately.

Frequently Asked Questions (FAQ)

1. Can the 1769‑L23E‑QBFC1B connect to a PanelView HMI?

Yes, the Allen‑Bradley 1769‑L23E‑QBFC1B connects directly to PanelView Plus terminals. Use the built‑in Ethernet/IP port for fast HMI communication.

2. How many expansion modules can I add to this controller?

The 1769‑L23E‑QBFC1B supports up to two (2) additional 1769 Compact I/O modules. This limit applies to the right side of the packaged controller.

3. What happens if the internal battery fails?

If the 1769‑BA battery fails without power, the 1769‑L23E‑QBFC1B loses all user program and data. Replace the battery every 12‑24 months as preventive maintenance.

4. Does this controller support ASCII barcode readers?

Yes, the RS232 port on the 1769‑L23E‑QBFC1B supports ASCII protocol. This allows direct connection to barcode scanners and serial printers.

5. Can I use DeviceNet devices with the 1769‑L23E‑QBFC1B?

Yes, but you need a separate 1769‑SDN DeviceNet scanner module. The controller itself does not have a built‑in DeviceNet port.

Key Benefits for Your Automation System

The Allen‑Bradley 1769‑L23E‑QBFC1B reduces panel space by integrating I/O and communication into one housing. You avoid buying separate discrete and analog modules for small machines. The embedded high‑speed counters replace a dedicated 1769‑HSC module. This lowers your total system cost. The Ethernet/IP port supports programming, HMI visualization, and SCADA data collection on one network. The isolated RS232 port handles legacy ASCII devices like barcode readers. With 512 KB memory, you can run medium‑complexity logic routines. This controller fits perfectly in packaging, material handling, and batch processing applications.