Brand: Allen-Bradley

Allen-Bradley 1769-L24ER-QB1B CompactLogix 5370 L2 Controller

Name: Allen-Bradley 1769-L24ER-QB1B L2 Controller | Seven Star LLC
Brand: Allen-Bradley
SKU: 1769-L24ER-QB1B

Description

A compact controller with 32 embedded I/O points for small machines

The Allen-Bradley 1769-L24ER-QB1B is a CompactLogix 5370 L2 controller that combines 750 KB of user memory, two EtherNet/IP ports and 32 embedded points of I/O in one DIN-rail unit. The embedded I/O is 16 DC inputs and 16 DC outputs, and the controller runs from a 24 V DC supply through its own isolated power input.

Because the I/O is built in, a small machine can often be controlled without any expansion at all. When more points are needed, up to four 1769 Compact I/O modules can be added on the right, which keeps the panel compact while leaving room to grow.

Technical specifications

Parameter	Specification
Catalog number	1769-L24ER-QB1B
Controller family	CompactLogix 5370 L2
User memory	750 KB
Embedded I/O	16 DC inputs and 16 DC outputs
Local expansion	Up to 4 Compact I/O modules
Ethernet ports	2 EtherNet/IP ports with Device Level Ring capability
Connections	8 EtherNet/IP and 120 TCP connections (product page)
Power supply	24 V DC input, embedded and isolated
Non-volatile memory	1784-SD1 card (1 GB) ships with the controller; 1784-SD2 (2 GB) ordered separately
Current draw, controller power	1.54 A at 5 V DC and 0.95 A at 24 V DC
Power dissipation, max	12 W
Weight / width	0.63 kg (1.39 lb) / 115 mm (4.53 in.)
Surrounding air, max	60 C
Relative humidity	5 to 95 percent non-condensing
Enclosure	None (open-style); install in a suitable enclosure
Approvals listed for the family	c-UL-us, including Class I Division 2; UKCA and CE; RCM; KC; EtherNet/IP conformance tested

Where it fits

A controller with embedded I/O suits pump skids, packaged utilities, conveyors and small process units that need a few dozen points and an Ethernet connection to a SCADA or HMI. The two Ethernet ports can run in a linear or ring topology, and the Device Level Ring capability lets a machine network keep working if one cable is cut.

Planning notes

Add the current drawn by every expansion module to the controller figures before choosing a supply, and use the manufacturer power-distance rule for the rail. The data sheet lists the controller power draw as 1.54 A at 5 V and 0.95 A at 24 V, with a maximum dissipation of 12 W, so heat in a closed cabinet should be checked. The 120 TCP connections and 8 EtherNet/IP connections come from the product page and should be matched to the number of devices and clients.

Because the 1769-L24ER-QB1B has its own isolated 24 V DC input, the first sizing step is the field supply: the controller draws 0.95 A at 24 V DC according to the data sheet, and any 24 V DC sensors or loads fed from the same source add to that. The unit is 115 mm wide and weighs 0.63 kg, so it fits on a standard DIN rail beside Compact I/O. Keep project files on the 1 GB SD card that ships with it, which gives a simple route to restore a program after a controller swap.

Documents and quotation

The linked technical data covers the CompactLogix 5370 range, including environmental limits and certifications for this model. For other controllers and I/O see the PLC & I/O Cards category. Send the catalog number and quantity to Seven Star LLC, an independent supplier in Muscat, to request a quotation.

Datasheets & Documents

Technical data Rockwell Automation CompactLogix 5370 Controllers Specifications, publication 1769-TD005 Download

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About brand

Allen-Bradley is the brand of Rockwell Automation for industrial control: ControlLogix and CompactLogix controllers, I/O systems, PanelView operator terminals, PowerFlex drives, motor control and industrial network equipment. The company began in Milwaukee in 1903, when Lynde Bradley and Dr. Stanton Allen formed the Compression Rheostat Company to make the motor speed controller Bradley had invented in 1901. It took the name Allen-Bradley in 1909 and was bought by Rockwell International in 1985. Since 2001 its owner has been Rockwell Automation, which is still headquartered in Milwaukee, Wisconsin.

Allen-Bradley company profile

Founded	1903, Milwaukee, Wisconsin, USA, as the Compression Rheostat Company
Founders	Lynde Bradley (inventor of the compression rheostat, 1901) and Dr. Stanton Allen (investor); Harry Bradley joined in 1904
Name	Allen-Bradley Company from 1909
Ownership	Acquired by Rockwell International in 1985 for about USD 1.65 billion; a brand of Rockwell Automation (NYSE: ROK) since 2001
Headquarters	Milwaukee, Wisconsin, USA
Product families	Logix programmable automation controllers (ControlLogix, CompactLogix), legacy SLC 500 and MicroLogix PLCs, Micro800 controllers, POINT, FLEX and Compact I/O, PanelView HMIs, PowerFlex AC drives, contactors, motor starters and soft starters, safety components, Stratix Ethernet switches

Milestones

1901: Lynde Bradley invents the compression rheostat to control the speed of electric motors.
1903: The Compression Rheostat Company is formed in Milwaukee with an initial investment of USD 1,000.
1904: Harry Bradley joins; a crane controller is shown at the St. Louis World's Fair.
1909: The company is renamed Allen-Bradley.
1985: Rockwell International acquires Allen-Bradley.
2001: Rockwell Automation becomes the company's name; the Allen-Bradley brand marks 100 years in 2003.

Reading Allen-Bradley catalogue numbers

The first digits of an Allen-Bradley catalogue number identify the platform, which tells you what is compatible with what. 1756 is ControlLogix (chassis-based, used for large process and plant control), 1769 is CompactLogix 5370 with Compact I/O, 5069 is CompactLogix 5380 with Compact 5000 I/O, 1734 is POINT I/O, 1794 and 5094 are FLEX and FLEX 5000 distributed I/O, 1746 and 1747 belong to the older SLC 500 family, 1766 is MicroLogix 1400 and 2080 is Micro800. For drives, 25B is PowerFlex 525 and 22B is PowerFlex 40; in a code such as 25B-D010N114, "D" means 380–480 V, "010" is the output current rating, and N114 instead of N104 means the drive has an integrated EMC filter. Many plants in the region still run SLC 500 and older MicroLogix systems, which Rockwell has discontinued, so exact spares and migration to CompactLogix are both common requests.

Where Allen-Bradley products are used

In Oman and the GCC, Allen-Bradley controllers and drives run on oil and gas facilities, water treatment and pumping stations, cement, food and beverage and packaging plants, and on machines supplied by American OEMs. ControlLogix is often the platform for plant control systems, while PowerFlex drives are used on pumps, fans and conveyors.

Allen-Bradley products we list

Family	Examples
ControlLogix	1756-L85E, 1756-EN2T, 1756-EN2TR, 1756-IF16, 1756-IB32, 1756-PA75, 1756-A10
CompactLogix and Micro controllers	5069-L320ER, 5069-L340ERM, 1769-L33ER, 1769-L16ER, MicroLogix 1400, Micro820, SLC 500 (1746)
Distributed I/O	1734-AENTR, 1734-IB8, 1734-IE2C, 1734-IB8S safety, 1794-AENTR, 5094-AENTR, 5069-IF8
Operator terminals	PanelView Plus 7 10-inch, PanelView Plus 7 15-inch, PanelView 800, PanelView 5310
Drives, motor control and networking	PowerFlex 525, PowerFlex 755, PowerFlex 4, 150-A180NBD SMC, Stratix 2000, 1783-NATR

Ordering Allen-Bradley products: what we need

Send the full catalogue number and the series letter from the label (for example 1756-EN2T Series D), because firmware and compatibility can change between series. For drives, add the motor power, voltage and filter option. For a discontinued SLC 500 or MicroLogix part, tell us whether you need the exact spare or a migration proposal.

Facts checked against Rockwell Automation's published company history, October 2026.

Browse Allen-Bradley products by category: PLC & I/O Cards, AC Drives.

FAQ

Questions about the Allen-Bradley 1769-L24ER-QB1B CompactLogix 5370 L2

Answers from our engineering team on installation, compatibility and integration.

01How much memory does the 1769-L24ER-QB1B have?

750 KB of user memory.

02What embedded I/O does it have?

16 DC inputs and 16 DC outputs.

03How many expansion modules can it use?

Up to four 1769 Compact I/O modules.

04What network ports does it have?

Two EtherNet/IP ports with Device Level Ring capability.

05What supply voltage does it use?

24 V DC through an embedded isolated input.