One New Allen Bradley 1769-L24ER-QB1B 1769L24ERQB1B

1769-L24ER-QB1B | CompactLogix 5370 L2 — 750KB / 16 DI + 16 DO / Dual EtherNet/IP DLR / 4 Expansion Modules / 32 Tasks / 24VDC Embedded Supply

Controller, I/O, and Power Supply — All Integrated

The 1769-L24ER-QB1B is a CompactLogix 5370 L2 packaged controller — a single unit that combines the controller processor, an embedded 24VDC power supply, and 32 integrated I/O points in one housing. The "QB1B" suffix designates this as the integrated I/O variant: 16 digital inputs and 16 digital outputs on a single embedded I/O module within the controller body.

This integration eliminates the need to specify, mount, and wire a separate power supply and separate I/O modules for the base I/O requirement. For a machine with up to 32 standard 24VDC I/O points, the controller handles everything from one rail position. Four additional 1769 Compact I/O expansion modules extend the system when the 32 embedded points are not enough.

The 2A per output point (8A per common) on the embedded outputs drives standard DC loads directly — solenoid valve coils, relay coils, 24VDC contactors, and indicator lamps without interposing hardware.

Key Specifications

Dual EtherNet/IP with DLR — Resilient Network Topology

Both Ethernet ports form an integrated two-port switch, enabling Device Level Ring (DLR) network topology. In a DLR ring, each device has two cable connections forming a closed loop. A single cable break anywhere in the ring reroutes traffic through the surviving path automatically. For production environments where a network cable fault would otherwise stop the line, DLR provides ring-level resilience without an external managed switch.

Up to 8 EtherNet/IP node connections support distributed I/O stations, drives with EtherNet/IP interfaces, remote I/O adapters, and HMI panels on the same network. For DeviceNet integration, a 1769-SDN scanner module in the expansion bus adds a DeviceNet master network.

32 Tasks and 100 Programmes — Programme Architecture Flexibility

The task structure supports up to 32 independent tasks — continuous, periodic, or event-driven. Each task accommodates up to 100 programmes. This architecture allows machine sequencing, motion control, I/O control, and HMI data management to run in separate tasks with independent execution priorities and intervals, without requiring multiple controllers.

Application Scenarios

Compact packaging and conveyor machines: 16 embedded sensor inputs, 16 embedded solenoid and motor outputs, and a 24VDC power supply — all in one unit. EtherNet/IP connects the HMI panel and a remote I/O station with no additional hardware.

Machine cells with DeviceNet devices: A 1769-SDN module in the expansion bus adds a DeviceNet network for drives, sensors, and actuators already wired to DeviceNet. EtherNet/IP handles supervisory and HMI traffic simultaneously.

OEM panel integration: The integrated power supply eliminates the external transformer or switch-mode supply for the controller. Panel space and wiring time are reduced compared to separate controller, power supply, and base I/O modules.

FAQ

Q1: What is the output current capability of the 16 embedded outputs?

Each of the 16 embedded outputs sources 2A at 24VDC. Eight outputs share each common terminal, with the common rated at 8A total. For maximum simultaneous load, ensure the combined current draw of all simultaneously active outputs on a common does not exceed 8A.

Q2: Can DeviceNet be used with the 1769-L24ER-QB1B?

Yes, via the 1769-SDN scanner module installed in one of the four expansion slots. The SDN module provides a DeviceNet master port for devices not available in EtherNet/IP format. This consumes one of the four available local expansion module positions.

Q3: What programming software is used for the 1769-L24ER-QB1B?

Studio 5000 Logix Designer is the standard programming environment for the CompactLogix 5370 family. Connection is via the USB port for direct programming or via either EtherNet/IP port for network programming. The controller supports Ladder Diagram, Structured Text, Function Block Diagram, and Sequential Function Chart programming languages.

Q4: What does the SD card provide beyond memory?

The 1 GB SD card (included; supports up to 2 GB) serves as non-volatile programme storage, a data log target for recipe files and event records, and a firmware update medium. Programme backup to SD card provides recovery capability without a programming terminal — a replacement controller can load from the SD card automatically at power-up.

Q5: How does the 1769-L24ER-QB1B differ from the 1769-L24ER-QBFC1B?

The QB1B has one embedded I/O module (16 DC inputs + 16 DC outputs). The QBFC1B has two embedded I/O modules — the same digital I/O plus an additional analogue and high-speed counter module. The QBFC1B is suited to applications needing built-in analogue I/O or high-speed counting; the QB1B covers applications where standard digital I/O is sufficient.