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Allen-Bradley 1769-L23-QBFC1B CompactLogix Packaged Controller

Configured for discrete and analog signal execution in CompactLogix controller platforms, the Allen-Bradley 1769-L23-QBFC1B (1769-L23-QBFC1B CompactLogix Packaged Controller) provides direct physical and electrical control functions through embedded I/O, RS-232 communication, and high-speed counter channels.

Hardware Specifications

Parameter	Specification
Model	1769-L23-QBFC1B
Brand	Allen-Bradley
Origin	USA
Product Type	CompactLogix Packaged Controller
Product Line	CompactLogix
Module Type	Processor Module
Weight	3.75 lbs (1.70 kg)
Operating Temp	0 to 60 deg C (32 to 140 deg F)
Storage Temp	-40 to 85 deg C (-40 to 185 deg F)
Power Consumption	Not specified in provided data
User Memory	512 KB
Communication Ports	Two RS-232 ports
Communication Protocols	Port 1: DF1 / ASCII / DH485; Port 2: DF1 / DH485
Embedded Digital Inputs	Sixteen 24 VDC inputs
Embedded Digital Outputs	Sixteen 24 VDC outputs
Analog Input Channels	Four differential or single-ended channels
Analog Input Range	0-10.5 VDC / 4-20 mA
Analog Output Channels	Two single-ended channels
Analog Output Range	0-10.5 VDC / 0-21 mA
High-Speed Counter Inputs	Four HSC inputs
Enclosure Type	Open-type
Mounting Method	DIN rail or panel mounting
Vibration Rating	5 g at 10 to 500 Hz
Operating Shock	30 g
Series	A and B
Replacement Terminal Block	1769-RTBN18
Wire Type	Copper, 90 deg C
Solid Wire Size	22-14 AWG
Stranded Wire Size	22-16 AWG
UPC	612598350742

EtherNet/IP and CompactLogix Control Architecture

The 1769-L23-QBFC1B integrates processor functions with embedded I/O resources inside a CompactLogix packaged controller design. Therefore, the controller reduces external module requirements for compact machine control applications.

The controller supports CompactLogix backplane communication methods and provides integrated I/O density scaling through sixteen 24 VDC digital inputs, sixteen 24 VDC digital outputs, analog channels, and high-speed counter inputs. In addition, the two RS-232 communication ports support DF1, ASCII, and DH485 serial communication protocols.

The hardware supports firmware-based CompactLogix system operation and maintains compatibility with controller configuration tools designed for the 1769 platform.

Frequently Asked Questions

Q: Does the 1769-L23-QBFC1B support Ethernet communication directly?
A: No. The provided specifications list two RS-232 communication ports. Ethernet communication requires additional hardware or a compatible system architecture.

Q: What analog signal types can the controller process?
A: The controller accepts four analog input channels configured for 0-10.5 VDC or 4-20 mA signals and provides two analog output channels configured for 0-10.5 VDC or 0-21 mA signals.

Q: Can the controller operate with DIN rail and panel installation methods?
A: Yes. The 1769-L23-QBFC1B supports both DIN rail mounting and panel mounting configurations.

Field Installation Guidelines

Install the 1769-L23-QBFC1B on a stable DIN rail or panel surface according to the CompactLogix installation requirements.

Maintain separation between analog signal wiring and high-voltage power conductors to reduce electrical interference. Use appropriate shield grounding practices for analog circuits, and connect cable shields according to the control cabinet grounding design.

Verify terminal block wiring before applying power. Confirm that 24 VDC input and output circuits match the configured I/O assignment. Ensure RS-232 communication cables follow recommended industrial routing practices to avoid signal disruption.

Provide adequate cabinet ventilation to maintain the specified operating temperature range. Before system startup, verify controller firmware compatibility and I/O configuration parameters within the programming environment.

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