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Allen-Bradley 1769-L24ER-QBFC1B CompactLogix Controller

Configured for controller task execution and EtherNet/IP communication in CompactLogix systems, the Allen-Bradley 1769-L24ER-QBFC1B (1769-L24ER Controller) provides programmable control, local I/O expansion, and Ethernet network connectivity. The controller supports 32 tasks, with up to 1000 programs per task, and provides 768 KB of onboard user memory.

Hardware Specifications

Parameter	Specification
Model	1769-L24ER-QBFC1B
Brand	Allen-Bradley
Product Line	CompactLogix
Product Type	Controller
Base Model	1769-L24ER
UPC	885630101255
Origin	Not specified in supplied data
Weight	2.06 lb (0.94 kg)
Onboard User Memory	768 KB
Maximum Number of Tasks	32
Programs per Task	1000
Internal Energy Storage	Supported
Battery	Not required
Ethernet Network	Supported
DLR Topology	Supported
Linear Topology	Supported
Traditional Star Topology	Supported
Local I/O Expansion	Up to 4 Compact I/O modules
Maximum Ethernet Nodes	8
Controller Connections	256

EtherNet/IP Communication and I/O Scaling

The 1769-L24ER-QBFC1B supports EtherNet/IP-based controller communication and multiple Ethernet network topologies. The controller supports DLR, linear, and traditional star configurations, allowing network architecture to match the physical installation.

Furthermore, the controller provides up to 256 controller connections and supports a maximum of 8 Ethernet nodes according to the supplied specifications. Local I/O expansion supports up to 4 Compact I/O modules, allowing the control system to scale without changing the controller platform.

The 768 KB onboard user memory stores the application and controller data required for programmed task execution. The controller supports 32 tasks, while each task can contain up to 1000 programs.

Frequently Asked Questions (FAQ)

Q: Does the 1769-L24ER-QBFC1B require a battery?

A: No. The supplied specifications identify the controller as not requiring a battery and indicate internal energy storage support.

Q: How many tasks can the controller execute?

A: The controller supports a maximum of 32 tasks, with up to 1000 programs assigned to each task.

Q: What Ethernet network topologies does the controller support?

A: The controller supports DLR, linear, and traditional star topologies.

Field Installation Guidelines

• Install the controller within the CompactLogix system according to the applicable Rockwell Automation installation documentation.
• Confirm the available panel space before installation because the supplied dimensional data does not specify enclosure or mounting dimensions.
• Maintain physical separation between Ethernet communication wiring and high-voltage or high-noise power conductors where practical.
• Route communication cables to minimize exposure to motor, contactor, transformer, and other high-noise circuits.
• Use the specified EtherNet/IP network topology consistently with the network design.
• Verify all local I/O module connections before applying system power.
• Confirm controller connection requirements against the configured Ethernet node count.
• Inspect grounding and bonding arrangements according to the applicable electrical installation standard and system documentation.
• Do not apply field wiring or power until terminal assignments and module compatibility have been verified.
• Verify firmware compatibility between the controller, connected Compact I/O modules, and programming environment before commissioning.

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