Allen-Bradley 1769-L24ER-QB1B CompactLogix Controller

The Allen-Bradley 1769-L24ER-QB1B is a high-performance programmable automation controller designed for small to medium-sized applications. This controller, part of the CompactLogix series, offers versatile I/O configuration, robust communication options, and expandable memory. It provides a reliable solution for a variety of industrial automation needs.

Key Features

Part Number: 1769-L24ER-QB1B
Product Type: Programmable Automation Controller (PAC)
Manufacturer: Allen-Bradley
Product Line: CompactLogix
Memory: 768KB embedded, expandable with 1GB or 2GB SD card
Mounting: DIN Rail
Dimensions: 4.53 x 4.13 x 4.65 inches (115 x 105 x 118 mm)
Weight: 2.00 lbs (0.91 kg)

Communication Ports

Ethernet: 2 ports for Device Level Ring (DLR) and linear topology
USB: 1 port for easy programming and configuration
RS232: 1 port supporting ASCII, DH485, DF1 protocols
Max Nodes on Ethernet: 8 devices
Supported Protocols: ASCII, DH485, DF1, Ethernet

I/O Configuration

Inputs: 16 Sinking / Sourcing 24V DC Digital Inputs
Outputs: 16 Sinking 24V DC Digital Outputs
Voltage Range:
- Inputs: 10VDC to 28.8VDC
- Outputs: 20.4VDC to 26.4VDC
Current Draws:
- At 5VDC: 1.54A
- At 24VDC: 0.95A
- Output Voltage Drop (On-state): 1V at 1A

Memory and Storage

Embedded Memory: 768KB (expandable to 2GB with SD card)
Non-volatile Memory:
- Standard: 1784-SD1 (1GB)
- Optional: 1784-SD2 (2GB)
Supported Memory Card Type: Secure Digital (SD)

Power Supply

Voltage: 24V DC Nominal (isolated)
Power Requirements: 24V DC for controller and peripherals

Performance and Programming

Number of Tasks: 32 tasks
Programs per Task: Up to 100
Axes over Ethernet: 2 axes
Programming Languages:
- Ladder Logic (for Safety Tasks)
- Structured Text
- Function Block Diagram (FBD)
- Sequential Function Charts (SFC)

Technical Specifications

Specification	Details
Model	1769-L24ER-QB1B
Power Supply	24V DC
Ethernet Ports	2
RS232 Ports	1
USB Ports	1
I/O Inputs	16 Sinking/Sourcing 24V DC
I/O Outputs	16 Sinking 24V DC
Voltage Range (Inputs)	10V DC to 28.8V DC
Voltage Range (Outputs)	20.4V DC to 26.4V DC
Maximum Current (Input)	1.54A at 5V DC, 0.95A at 24V DC
Maximum Current (Output)	0.83A at 40°C, 0.5A at 60°C
Operating Temperature	0°C to 60°C
Memory (Expandable)	768KB (expandable to 2GB via SD card)
Mounting Type	DIN Rail
Dimensions (H x W x D)	4.53 x 4.13 x 4.65 inches (115 x 105 x 118 mm)
Weight	2.00 lbs (0.91 kg)

Where to Use

The Allen-Bradley 1769-L24ER-QB1B is ideal for applications requiring reliable I/O processing and robust communication, including remote access through Ethernet. With its support for up to 4 Compact I/O modules and a maximum of 32 controller tasks, it is suitable for use in industrial automation, machine control, and process automation systems.