Allen-Bradley 1769-L23E-QBFC1B CompactLogix L23E Ethernet Packaged Controller

Description

Key Technical Specifications

Product Introduction & Supply Chain Strategy

This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Allen-Bradley 1769-L23E-QBFC1B is a highly integrated CompactLogix packaged controller. By combining CPU processing, dual communication ports, power supply, 32 digital I/O points, 6 analog channels, and 4 high-speed counter channels into a single chassis, it serves as a self-contained automation hub for standalone machines, skid controls, and process loops.

Because the 1769-L23E platform is a legacy, highly dense system, procuring genuine New Surplus hardware is critical to avoiding unexpected operational downtime. Refurbished 1769-L23E-QBFC1B controllers present high operational risks: second-hand units frequently suffer from degraded internal 24V DC power rails, dried-out filtering capacitors, and worn optocouplers on the embedded high-speed counter inputs. Installing factory-fresh New Surplus hardware preserves original 512 KB memory execution speed, guarantees accurate 14-bit analog loop handling, and delivers a significantly lower Total Cost of Ownership by eliminating emergency engineering redesigns.

1769-L23E-QBFC1B

1769-L23E-QBFC1B

1769-L23E-QBFC1B

Installation & Configuration Guide

1.Pre-Installation (Prep & Safety):Safety warning: Ensure 24V DC power feeder is de-energized before mounting or wiring.

Isolate the main 24V DC system power supply and apply Lock-Out/Tag-Out (LOTO) protocols. Wear a grounded ESD wrist strap before handling terminal connections. Verify panel spacing allows proper thermal dissipation and check that the 1769-ECR end cap is available for the right side of the unit.

2.Removal:

Label and disconnect all field wiring harnesses, including the 24V DC power connector, digital I/O terminal blocks, analog wiring, Ethernet RJ-45 cable, and RS-232 DB-9 serial connection. Release the DIN rail mounting clips at the top and bottom of the unit, then lift the controller off the 35 mm DIN rail.

3.Installation (Clone & Seat):

Unpack the New Surplus 1769-L23E-QBFC1B controller inside an ESD-protected zone. Secure the unit onto the DIN rail or panel mount using mounting screws. Ensure the 1769-ECR right-end cap is firmly latched onto the rightmost bus interface. Reconnect the digital, analog, power, Ethernet, and serial cables according to original schematic labels.

4.Power-On & Testing:

Reapply 24V DC power to the controller. Confirm that the OK LED transitions to solid green and the LINK LED indicates active EtherNet/IP traffic. Connect via RSLogix 5000 / Studio 5000, set the IP address using the BOOTP/DHCP tool or software properties, download the machine project, and verify all onboard digital and analog tags communicate without fault codes.

Firmware/Software Versions & Upgrade Notes

• Software Compatibility: Programmed exclusively using RSLogix 5000 / Studio 5000 (Major Revisions 17 through 20 supported).
• IP Address Configuration: The Ethernet port defaults to DHCP enabled. Use the Allen-Bradley BOOTP/DHCP utility or RSLinx Classic via the RS-232 serial port (Channel 0) to assign a static IP address during initial commissioning.
• CompactFlash Backup: Inserting a 1784-CF64 or 1784-CF128 CompactFlash card allows non-volatile project backup. Configure controller properties to “Load Image on Power Up” to ensure automatic system recovery in the event of a total battery discharge.

Frequently Asked Questions (FAQ)

What does the “QBFC1B” suffix in the catalog number 1769-L23E-QBFC1B stand for?

The suffix breaks down the embedded hardware feature set:

• Q: 24V DC Digital Inputs (16 points)
• B: 24V DC Sourcing Digital Outputs (16 points)
• F: Fast / High-Speed Counters (4 HSC channels)
• C: Combination Analog I/O (4 Analog Inputs / 2 Analog Outputs)
• 1B: Integrated 24V DC Power Supply base

Why is this New Surplus 1769– preferred over a refurbished unit?

Refurbished units often retain worn onboard DC-to-DC converter components and degraded analog-to-digital converters (ADCs). In high-speed packaging or process applications, ADC signal drift can cause erroneous temperature or pressure readings, leading to false process trips or defective product runs. New Surplus guarantees factory-calibrated analog components, uncompromised memory retention, and full operating life.

Are these 1 controllers genuine Allen-Bradley products?

Yes. We strictly guarantee that every 1 controller supplied is 100% Original OEM New Surplus. Sourced from audited distributor overstock, OEM machine builder inventory, and verified project reserves, each controller undergoes visual inspection, power-on testing, port handshake verification, and I/O bus checks before shipment.

How many additional 1769 Compact I/O expansion modules can be added to this controller?

The 1 supports up to 3 additional 1769 Compact I/O modules attached to the right side of the unit. The rightmost bank must always be terminated with a 1769-ECR or 1769-ECL end cap.

What warranty coverage is provided with this New Surplus controller?

All New Surplus 1 controllers are backed by our full 1-year replacement warranty. If any functional hardware failure or CPU fault occurs within 12 months under standard working conditions, we will replace the unit immediately from our available stock.