PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1756-L81E is a ControlLogix controller module designed for industrial automation applications. It provides 3 MB of user memory and addresses up to 128,000 total digital and analog I/O points. The processor supports 32 independent tasks, with each task capable of executing up to 1,000 programs. It features an open-style enclosure designed for installation directly into a ControlLogix chassis slot.
Network connectivity includes an integrated Ethernet port operating at 10, 100, or 1000 Mbps. A built-in USB port transfers diagnostic and configuration data at 12 Mbps. The controller directly supports ControlNet, DeviceNet, and remote I/O communication architectures. Continuous isolation voltage is rated at 50 Volts to protect internal electronic circuits. Power dissipation equals 6.2 Watts with thermal dissipation measured at 21.2 BTU per hour.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| UPC | 887172361326 |
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| Weight | 1.44 lbs (0.65 kg) |
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| Number of Tasks | 32 Tasks |
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| Number of Programs per Task | 1000 Programs per Task |
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| Event Triggers Option | No limit for local I/O triggers |
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| USB Ports | 1 Port |
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| USB Port Speed | 12 Mbps |
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| Ethernet Port | 1 Port |
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| Ethernet Port Speeds | 10, 100, or 1000 Mbps |
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| Ethernet Communication | Supported |
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| ControlNet Communication | Supported |
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| DeviceNet Communication | Supported |
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| Remote I/O Communication | Supported |
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TECHNICAL INFORMATION
Features
- Contains 3 MB of integrated user memory for program execution and data storage.
- Supports up to 32 independent tasks with 1,000 programs per task.
- Equipped with one Ethernet port running at 10, 100, or 1000 Mbps.
- Includes one USB port operating at 12 Mbps for programming connections.
- Directly supports ControlNet, DeviceNet, and remote I/O network protocols.
- Provides unlimited event triggers for local input and output signals.
TECHNICAL INFORMATION
Applications
- High-speed machinery requiring deterministic control and diverse network integration.
- Centralized process control architectures handling extensive digital and analog field instrumentation.
- Distributed automation systems utilizing Ethernet, ControlNet, and DeviceNet protocols.
TECHNICAL INFORMATION
Connections / Interfaces
- One onboard Ethernet port supporting 10, 100, and 1000 Mbps network speeds.
- One USB port operating at 12 Mbps for controller configuration and service.
- Direct backplane interface connecting to ControlLogix chassis power and communication lines.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the controller directly into an available slot within a ControlLogix chassis.
- Install the open-style module in an enclosure that provides appropriate environmental protection.
- Maintain clear spacing around the chassis to support proper convective cooling.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure network communication settings using the onboard Ethernet port.
- Set task priority levels and assign up to 1,000 programs per task.
- Define event triggers for local I/O within the programming software.
TECHNICAL INFORMATION
Compatibility
- Installs into standard Allen-Bradley ControlLogix 1756 chassis backplanes.
- Communicates across Ethernet, ControlNet, DeviceNet, and remote I/O networks.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSInstalls into standard Allen-Bradley ControlLogix 1756 chassis backplanes. Communicates across Ethernet, ControlNet, DeviceNet, and remote I/O networks.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
How much user memory does the Allen-Bradley 1756-L81E controller provide?
The 1756-L81E controller includes 3 MB of user memory for program execution and data storage.
What network ports are available on the 1756-L81E controller module?
The unit features one Ethernet port supporting 10, 100, or 1000 Mbps speeds and one 12 Mbps USB port.
How many tasks and programs can execute on the 1756-L81E?
The module supports up to 32 independent tasks, each handling up to 1,000 programs.
What industrial communication protocols does the 1756-L81E support?
It directly supports Ethernet, ControlNet, DeviceNet, and remote I/O communication protocols.
