Allen-Bradley 1769-L24ER-QB1B

CompactLogix 750KB DI/O Controller

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Allen-Bradley 1769-L24ER-QB1B CompactLogix controller: 750 KB memory, EtherNet/IP for up to 8 nodes, embedded 24V DC inputs.

Manufacturer: Allen-Bradley
Manufacturer part no.: 1769-L24ER-QB1B
Product family: CompactLogix and Compact GuardLogix Controllers (1769 and 1768)
Type: CompactLogix controller
Weight: approx. 0.63 kg (1.39 lb)
Category: PLCs and I/O › CPU and processor modules
Lifecycle: Active
OEM successor: Not stated
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Allen-Bradley
Manufacturer part no.: 1769-L24ER-QB1B
Type: CompactLogix controller
Application: PLC controller
Used with: 1769 Compact I/O
Controller tasks: 32 tasks 100 programs/task
Communication: EtherNet/IP, DeviceNet via 1769-SDN scanner
EtherNet/IP node: Up to 8 nodes
Sockets, max: 32
Programming: Relay ladder, Structured Text, Function block, SFC
Temperature, operating: 0…60 °C (32…140 °F)
Temperature, storage: -40…+85 °C (-40…+185 °F)
Temperature, surrounding air: 60 °C (140 °F)
Relative humidity: 5…95% noncondensing
Vibration: 2 g @ 10…500 Hz
Shock, operating: 30 g
Shock, nonoperating: 50 g
Emissions: IEC 61000-6-4
ESD immunity: 6 kV contact discharges 8 kV air discharges
Radiated RF immunity: 10V/m with 1 kHz sine wave 80% AM from 80…6000 MHz
EFT/B immunity: ±3 kV at 5 kHz on power ports ±3 kV at 5 kHz on signal ports ±3 kV at 5 kHz on communication ports
Surge transient immunity: ±1 kV line-line (DM) and ±2 kV line-earth (CM) on power ports ±1 kV line-line (DM) and ±2 kV line-earth (CM) on signal ports ±2 kV line-earth (CM) on shielded ports ±2 kV line-earth (CM) on communication ports
Conducted RF immunity: 10V rms with 1 kHz sine wave 80% AM from 150 kHz…80 MHz
User memory: 750 KB
Optional nonvolatile: 1784-SD1 card with 1 Gb of available memory (shipped with controller) 1784-SD2 card with 2 Gb of available memory (available for separate ordering)
Number of I/O module: 1
Current draw @ 5V DC: 1.54 A
Current draw @ 24V: 0.95 A
Power dissipation: 12 W 1769-L24ER-QBFC1B, L27ERM-QBFC1B: 21 W
Isolation voltage: 30V (continuous), Basic Insulation Type, USB to system, Ethernet to system and, Ethernet to Ethernet, Type tested at 500V AC for 60 s

Show all 56 specifications

Weight, approx: 0.63 kg (1.39 lb)
Module width: 115.00 mm (4.53 in.)
Module location: DIN rail or panel mount
Panel-mount screw: 1.1…1.8 Nm (10…16 lbin) - use M4 or #8 screws
Embedded power: 24V DC Input, isolated
Wire category: 1 - signal ports 1 - power ports 2 - communication ports
Wire type, Ethernet: RJ45 connector according to IEC 60603-7, 2 or 4 pair Category 5e minimum cable according to TIA 568 B.1 or Category 5 cable according to ISO/IEC 24702
Wire type, power: Copper
Wire size, power: 0.25…2.50 mm2 (22…14 AWG) solid copper wire rated at 75 °C (167 °F), or greater 1.2 mm (3/64 in.) insulation, max, Each terminal accepts only 1 wire
Wire stripping length: 8 mm (0.31 in)
Screw torque, power: 1.0…1.2 Nm (8.9…10.6 lbin)
Wire size, embedded I/: 0.205…1.31 mm2 (24…16 AWG) solid or stranded copper wire rated at 90 °C (194 °F), or greater 1.2 mm (3/64 in.) insulation, max or 90 °C (194 °F), Each terminal accepts only 1 wire
North American: T3C
IECEx temperature: T4
Enclosure type rating: None (open-style)
Voltage category: 24V DC sink/source
Operating voltage range: 10…28.8V DC @ 40 °C (104 °F) 10…26.4V DC @ 60 °C (140 °F) 24V DC nom
Off-state voltage, max: 5V DC
Off-state current, max: 1.5 mA
On-state current, min: 2 mA @ 24V DC per channel
On-state current, max: 5 mA @ 24V DC per channel
Cyclic update time: 0.5…750 ms
IEC input compatibility: Type 3
Isolated groups: Group 1: inputs 0…7, Group 2: inputs 8…15, Isolated groups operate in either sink or source configurations
Input voltage range: 19.2…31.2V DC
Input voltage, nom: 24V DC

Technical documents (1)

Rockwell Automation technical data 1769-TD005

Key features

32 tasks with 100 programs per task
Relay ladder, Structured Text, function block and SFC programming
Two isolated input groups: inputs 0…7 and 8…15
DIN rail or panel mount, open-style enclosure
1784-SD1 card with 1 Gb shipped with controller

About the Allen-Bradley 1769-L24ER-QB1B

The 1769-L24ER-QB1B is a CompactLogix 750KB DI/O controller. It has 750 KB of user memory and runs 32 tasks with 100 programs per task. Its embedded inputs are 24V DC sink/source, with an input range of 19.2…31.2V DC. It works from 0…60 °C and weighs approximately 0.63 kg.

What is the 1769-L24ER-QB1B used for?

It controls a machine with I/O on board, programmed in relay ladder, Structured Text, function block or SFC. It talks EtherNet/IP with up to 8 nodes and DeviceNet through a 1769-SDN scanner. Its embedded inputs sit in two isolated groups, and it mounts on DIN rail or panel.

Lifecycle and successor

Active Mature (Rockwell Automation lifecycle status, checked 24 October 2026).

Before you order

What to photograph or confirm so the right unit is quoted.

Read the catalog number 1769-L24ER-QB1B, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.

Other parts in the Allen-Bradley CompactLogix and Compact GuardLogix Controllers family

Listed for reference. They differ from the 1769-L24ER-QB1B in rating, supply, interface or function and are not interchangeable with it unless Allen-Bradley says so. Match the part number on your unit.

Product	Type	Lifecycle	Qty Available	Price	Action
Allen-Bradley 1768-L43CompactLogix L43 Controller, 2 MB Memory	CompactLogix controller	Discontinued	On request	On request	View
Allen-Bradley 1768-L45CompactLogix L45 Controller, 3 MB Memory	CompactLogix controller	Discontinued	In stock	On request	View
Allen-Bradley 1769-L30ERMCompactLogix 1 MB Motion Controller	CompactLogix controller	Active	On request	On request	View
Allen-Bradley 1769-L33ERMCompactLogix 2 MB Motion Controller	CompactLogix controller	Active	In stock	On request	View
Allen-Bradley 1769-L36ERMCompactLogix 3 MB Motion Controller	CompactLogix controller	Active	On request	On request	View
Allen-Bradley 1769-L38ERMSKCompact GuardLogix 5370 Safety Controller, 5 MB/1.5 MB	Compact GuardLogix safety controller	Phased out	On request	On request	View
Allen-Bradley 1769-L16ER-BB1BCompactLogix L16 384KB Controller with Embedded I/O	CompactLogix controller	Active	On request	On request	View
Allen-Bradley 1769-L18ER-BB1BCompactLogix L18 512KB Controller, Active	CompactLogix controller	Active	On request	On request	View
Allen-Bradley 1769-L27ERM-QBFC1BCompactLogix 1MB Controller with Embedded I/O	CompactLogix controller	Active	On request	On request	View
Allen-Bradley 1769-L30ER-NSECompactLogix 1 MB No Cap Controller	CompactLogix controller	Active	On request	On request	View
Allen-Bradley 1769-L32ECompactLogix 750KB Ethernet Controller Module	CompactLogix controller	Discontinued	On request	On request	View
Allen-Bradley 1769-L35ECompactLogix 1.5MB ENet Controller	CompactLogix controller	Discontinued	On request	On request	View

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