Allen-Bradley 1769-L23E-QB1B CompactLogix Controller Unit
The Allen-Bradley 1769-L23E-QB1B, also cataloged as the 1769-L23E-QB1B CompactLogix Controller Unit, operates as a dedicated hardware component for integrated logic processing, discrete/analog signal acquisition, and serial/Ethernet communication within CompactLogix control architectures. The packaged controller integrates 512 KB user memory, embedded I/O channels (16 DC inputs, 16 DC outputs, 4 analog inputs, 2 analog outputs), an EtherNet/IP port, and an RS-232 serial interface to execute real-time machine automation tasks directly while supporting expansion across local 1769 modules.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-L23E-QB1B |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.08 kg (2.38 lbs) |
| Dimensions | 185.2 x 118 x 123.9 mm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 1000 mA at 5 VDC, 710 mA at 24 VDC (7 W power dissipation) |
| Power Supply Input | Integrated 24 VDC |
| User Memory | 512 KB |
| Embedded Discrete I/O | 16 24 VDC inputs (sink/source), 16 24 VDC outputs (source) |
| Embedded Analog I/O | 4 analog inputs, 2 analog outputs |
| Communication Ports | 1 Ethernet RJ-45 (10/100 Mbps), 1 RS-232 serial port |
| Local Expansion Limit | Up to 2 or 3 local 1769 expansion modules |
| Memory Backup Battery | 1769-BA lithium battery |
Industrial Control & Drive Integration
The packaged controller relies on backplane bus communication velocity to manage execution timing across concurrent control tasks and local 1769 I/O expansion expansion cards. EtherNet/IP deterministic networks deliver scheduled I/O message routing and peer-to-peer data transfers over 10/100 Mbps Ethernet channels. Firmware flash compatibility checks ensure sustained synchronization between logic execution, memory tables, and serial DF1/DH-485 communications.
Frequently Asked Questions
Q: Does the 1769-L23E-QB1B controller support hot-swapping or Removal and Insertion Under Power (RIUP)?
A: No, the 1769-L23E-QB1B does not support RIUP. Disconnecting or attaching local 1769 expansion modules while the 24 VDC input power is active causes backplane bus errors and risks damaging internal circuit components.
Q: How is non-volatile program memory maintained during an unpowered state?
A: The controller retains volatile memory via an installable 1769-BA lithium battery. Ensure the battery maintains adequate charge levels to prevent project logic and variable state erasure when main power shuts down.
Field Installation Guidelines
Mount the controller vertically onto a standard 35 mm DIN rail or secure it directly to an enclosure backplate using mounting screws. Install a 1769-ECR right end cap on the right side of the assembly to terminate the 1769 backplane bus properly before applying power. Maintain a minimum clearance of 50 mm above and below the chassis for adequate convection thermal dissipation. Segregate 24 VDC power, analog signal lines, and Ethernet communication cabling from high-voltage AC lines to prevent EMI-induced signal corruption.
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| Condition | 100% New with Original Package |
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| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
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