PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1756-L84E is a ControlLogix controller designed for automation applications. It provides 20 MB of user program storage memory. The unit controls up to 128,000 digital input and output points. It also interfaces up to 4,000 analog input and output channels. An onboard energy storage module retains memory contents without requiring a maintenance battery.
The controller features one embedded 1 GB Ethernet port supporting 10/100/1000 Mbps speeds and 250 nodes. It also includes one USB 2.0 port operating at 12 Mbps. The single-slot module installs directly into any compatible 1756 chassis slot. It supports distributed architectures across EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, and SynchLink networks.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| UPC | 887172361364 |
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| Weight | 1.75 lbs (0.79 kg) |
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| Isolation Voltage | 50 Volts Continuous |
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| Power Dissipation | 6.2 Watts |
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| Current Draw (5.1 Volts) | 1.20 Miliamperes |
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| Current Draw (1.2 Volts DC) | 5.0 Miliamperes |
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| User Memory | 20 MB |
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| Module Type | ControlLogix Controller |
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| Enclosure | None (Open-Style) |
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| Communication interfaces | One (1) Ethernet; One (1) USB |
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| Chassis | 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756-A17 K Series B, Series C |
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| Standard Power Supply | 1756-PA50, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K, 1756-PH75, 1756-PC75 |
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| Redundant Power Supply | 1756-PA75R, 1756-PA75RK, 1756-PB75R, 1756-PB75RK, 1756-PSCA2, 1756-PSCA2K |
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| Maximum I-O | 128,000 |
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| Maximum Analog I-O | 4,000 |
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| Maximum Digital I-O | 128,000 |
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| Thermal Dissipation | 21.2 BTU per hour |
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TECHNICAL INFORMATION
Features
- Provides 20 MB of user memory for program and data storage.
- Includes one integrated Gigabit Ethernet port supporting up to 250 nodes.
- Features one USB 2.0 communication port running at 12 Mbps.
- Controls up to 128,000 discrete and 4,000 analog input and output points.
- Integrated energy storage module eliminates the requirement for external lithium backup batteries.
- Supports optional 2 GB non-volatile storage using a 1784-SD2 Secure Digital card.
TECHNICAL INFORMATION
Applications
- Large-scale plant automation requiring distributed control over EtherNet/IP networks.
- Systems with high-density discrete and analog I/O requirements across 1756 chassis.
- Integrated motion control architectures communicating over deterministic Ethernet links.
TECHNICAL INFORMATION
Connections / Interfaces
- One integrated 10/100/1000 Mbps Gigabit Ethernet RJ45 port.
- One USB 2.0 interface supporting 12 Mbps local communication.
- Chassis backplane drawing 5.0 mA at 1.2V DC and 1.20 mA at 5.1V DC.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into any available slot of a compatible 1756 ControlLogix chassis.
- Ensure cabinet temperatures stay within the operational limit of 0 to 60 degrees Celsius.
- Maintain clear airflow around the unit to dissipate 21.2 BTU per hour of heat.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure controller parameters using Studio 5000 Logix Designer Application Version 3.0 or greater.
- Set Ethernet network addressing and connection properties through the embedded communication port.
- Install an optional 1784-SD2 card for non-volatile project backup and restore operations.
TECHNICAL INFORMATION
Compatibility
- Mounts in 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17 chassis.
- Operates with standard power supplies including 1756-PA72, 1756-PA75, 1756-PB72, and 1756-PB75.
- Supports redundant power supply systems such as 1756-PA75R, 1756-PB75R, and 1756-PSCA2.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- Built-in energy storage modules eliminate routine battery maintenance intervals.
- Single-slot form factor allows direct installation into standard ControlLogix chassis slots.
TECHNICAL INFORMATION
Compliance and Certifications
- Provides 50V continuous isolation tested at 1000V AC for 1 minute.
- Rated with temperature code T4 for industrial operational safety.
- Withstands shock ratings up to 30G and operational vibration up to 2G.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSMounts in 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17 chassis. Operates with standard power supplies including 1756-PA72, 1756-PA75, 1756-PB72, and 1756-PB75. Supports redundant power supply systems such as 1756-PA75R, 1756-PB75R, and 1756-PSCA2.
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
What communication ports are embedded on the 1756-L84E controller?
The unit includes one 10/100/1000 Mbps Ethernet port and one 12 Mbps USB 2.0 port.
Does the 1756-L84E controller require a lithium backup battery?
No, an internal energy storage module preserves memory without requiring replaceable batteries.
Which programming software is required for the 1756-L84E controller?
Programming requires Studio 5000 Logix Designer Application Version 3.0 or greater.
What is the memory capacity of the 1756-L84E controller?
The controller provides 20 MB of user memory and supports an optional 2 GB 1784-SD2 card.
