Allen-Bradley 1756-L84E ControlLogix Controller 20MB 128k I/O
Introduction:
High-performance ControlLogix controller with 20MB memory. Supports 128k discrete I/O and 4k analog I/O. 1GB Ethernet port. No battery required.
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Product Overview
Controller Design and Application
The Allen-Bradley 1756-L84E is a ControlLogix controller from the high-performance 5580 series. This advanced controller is tailor-made for large-scale manufacturing environments. It handles a staggering 128,000 discrete I/O points and 4,000 analog I/O points. Consequently, the 1756-L84E suits complex automation applications requiring massive I/O capacity. The controller fits into any 1756 chassis slot and occupies exactly one slot width.
Communication Capabilities
The 1756-L84E comes with integrated communication ports for flexible connectivity. The embedded Ethernet port supports 10/100/1000 Mbps transmission speeds. Therefore, it easily exchanges data with other controllers, HMIs, and SCADA systems on the same network. The USB 2.0 port provides 12 Mbps communication speed for programming and data transfer. Consequently, the controller supports local I/O control as well as distributed I/O architectures.
Network Protocol Support
This controller supports a wide range of industrial networks for maximum compatibility. For example, EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, and SynchLink are all supported. Third-party process and device networks are also compatible. Consequently, the 1756-L84E integrates seamlessly into existing multi-vendor environments.
Technical Specifications
General Specifications
Manufacturer: Rockwell Automation
Brand: Allen-Bradley
Part Number: 1756-L84E
Series: ControlLogix (5580 series)
Product Type: ControlLogix Controller
Enclosure: Open-Style (none)
UPC: 887172361364
Memory Specifications
| Parameter | Value |
|---|---|
| User Memory | 20 MB |
| Non-Volatile Expansion | 2GB Secure Digital (SD) card (1784-SD2) |
| Battery Requirement | None (battery-free operation) |
| Energy Storage | Modern energy storage solution integrated |
I/O Capacity
| Parameter | Value |
|---|---|
| Maximum Discrete I/O | 128,000 |
| Maximum Analog I/O | 4,000 |
| Maximum Digital I/O | 128,000 |
Communication Specifications
| Port Type | Details |
|---|---|
| Ethernet Port | 1 (embedded) |
| Ethernet Speed | 10/100/1000 Mbps (1 GB) |
| USB Port | 1 (USB 2.0) |
| USB Speed | 12 Mbps |
| Maximum Ethernet Nodes | 250 |
| Integrated Motion Control | Yes (over EtherNet/IP) |
Network Protocols Supported
EtherNet/IP
ControlNet
DeviceNet
Data Highway Plus
Remote I/O
SynchLink
Third-party process networks
Power and Current Specifications
| Parameter | Value |
|---|---|
| Current Draw (1.2 V DC) | 5.0 mA |
| Current Draw (5.1 V) | 1.20 mA |
| Power Dissipation | 6.2 W |
| Thermal Dissipation | 21.2 BTU per hour |
Isolation Specifications
| Isolation Type | Value |
|---|---|
| Isolation Voltage (Continuous) | 50 Volts |
| USB-to-Backplane | 50V isolation |
| Ethernet-to-Backplane | 50V isolation |
| USB-to-Ethernet | 50V isolation |
| Basic Insulation Test | 1000V AC for 1 minute |
Environmental Specifications
| Parameter | Value |
|---|---|
| Operating Temperature | 0 to 60°C |
| Relative Humidity | 5 to 95% non-condensing (no derating) |
| Temperature Code | T4 |
| Shock Tolerance | 30G |
| Vibration Tolerance | 2G |
Compatible Chassis
The 1756-L84E fits in any of the following 1756 chassis.
| Series | Models |
|---|---|
| Series B, C | 1756-A4, A4K, A7, A7K, A10, A10K, A13, A13K, A17, A17K |
Compatible Power Supplies
Standard Power Supplies:
1756-PA50, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K
1756-PB50, 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K
1756-PH75, 1756-PC75
Redundant Power Supplies:
1756-PA75R, 1756-PA75RK
1756-PB75R, 1756-PB75RK
1756-PSCA2, 1756-PSCA2K
Programming and Configuration
Programming Software: Studio 5000 Logix Designer Application
Minimum Version: Version 3.0 or above
Task Capacity: Unlimited (with local I/O event triggers)
User Program Storage: 20 MB
Long-Term Storage: Optional 1784-SD2 2GB SD card
Installation Guide
Follow these steps to install the Allen-Bradley 1756-L84E correctly.
Power Down Chassis: First, disconnect power from the 1756 chassis completely.
Select Slot: Next, choose any available slot in the chassis (single slot width).
Insert Controller: Then, slide the 1756-L84E firmly into the selected slot.
Secure Module: After that, engage the locking mechanism to hold the controller in place.
Connect Ethernet: Meanwhile, attach Ethernet cables to the 1GB port for network communication.
Apply Power: Finally, restore power and verify the controller status.
The 1756-L84E requires no battery for memory retention. Therefore, the integrated energy storage module eliminates battery replacement maintenance. In addition, ensure proper chassis grounding for optimal noise immunity. Consequently, proper installation ensures reliable controller operation.
Package List
The package includes the following physical items.
Allen-Bradley 1756-L84E ControlLogix controller (1 piece)
Integrated energy storage module (factory installed)
Product label with part number and specifications
Anti-static protective bag for safe transport
*Note: The 1784-SD2 2GB Secure Digital card is not included. Ethernet and USB cables are sold separately. Programming software is not provided with this controller.*
Frequently Asked Questions (FAQ)
1. How much user memory does the 1756-L84E have?
The Allen-Bradley 1756-L84E provides 20 MB of user memory for program and data storage. Therefore, it handles large, complex control applications with ease. A 2GB Secure Digital card (1784-SD2) can expand non-volatile memory capacity. Consequently, you have ample storage for extensive programs and data logging.
2. What is the maximum I/O capacity of the 1756-L84E?
The Allen-Bradley 1756-L84E supports up to 128,000 discrete I/O points and 4,000 analog I/O points. Therefore, it is tailor-made for large-scale manufacturing environments. The controller manages both local I/O control and distributed I/O architectures. Consequently, massive automation systems are easily implemented with this controller.
3. Does the 1756-L84E require a battery?
No, the Allen-Bradley 1756-L84E does not require a battery for memory retention. Therefore, the integrated energy storage module eliminates battery replacement and disposal. This design makes the controller both user-friendly and environmentally friendly. Consequently, no battery-related maintenance is needed throughout the controller's life.
4. What communication speeds does the 1756-L84E support?
The Allen-Bradley 1756-L84E features a 1GB embedded Ethernet port supporting 10/100/1000 Mbps. Therefore, high-speed data exchange with HMIs, SCADA, and other controllers is possible. The USB 2.0 port supports 12 Mbps communication for programming. Consequently, the controller delivers superior performance for data-intensive applications.
5. What programming software is required for the 1756-L84E?
The Allen-Bradley 1756-L84E requires Studio 5000 Logix Designer Application version 3.0 or above. Therefore, ensure your software version meets this minimum requirement. The controller supports unlimited tasks through local I/O event triggers. Consequently, complex automation strategies are easily implemented.
6. What is the operating temperature range of the 1756-L84E?
The Allen-Bradley 1756-L84E operates at temperatures from 0 to 60°C. Therefore, it functions reliably in typical industrial environments. The controller withstands 30G shock and 2G vibration without performance degradation. Consequently, it is very durable for demanding manufacturing conditions.
7. What isolation does the 1756-L84E provide?
The Allen-Bradley 1756-L84E provides 50V continuous isolation between USB-to-backplane, Ethernet-to-backplane, and USB-to-Ethernet. Basic insulation is tested at 1000V AC for 1 minute. Therefore, your control system is protected from ground loops and electrical noise. Consequently, reliable communication is maintained even in electrically noisy environments.
Related Accessories
Enhance your ControlLogix system with these compatible parts.
SD Card: Allen-Bradley 1784-SD2 for 2GB non-volatile memory expansion
Chassis: Allen-Bradley 1756-A series for controller and I/O mounting
Power Supply: Allen-Bradley 1756-P series for backplane power
Ethernet Cable: Shielded Cat6 cable for 1GB communication
Programming Software: Rockwell Studio 5000 Logix Designer v3.0 or higher
Always use genuine Allen-Bradley components with the 1756-L84E. Therefore, third-party SD cards may not be compatible with the controller. In addition, verify chassis and power supply compatibility before installation. Consequently, using authentic parts ensures optimal controller performance and system reliability.