1756-L84E Allen-Bradley ControlLogix 5580 Controller
Product Introduction
The 1756‑L84E from Allen‑Bradley is a premium ControlLogix 5580 controller built for complex, high‑demand manufacturing environments. It offers a substantial 20 MB of user memory, providing ample space for large programs, data tables, and complex logic routines. This controller features an integrated 1 GB Ethernet port that supports 10/100/1000 Mbps link speeds, enabling seamless communication with HMIs, SCADA systems, and other controllers. Additionally, a USB 2.0 port delivers 12 Mbps transfer rates for local programming and diagnostics. The 1756‑L84E supports up to 128,000 discrete I/O and 4,000 analog I/O points, making it ideal for extensive distributed I/O architectures. It eliminates the need for batteries by incorporating a modern energy storage module, reducing maintenance and environmental impact.
Technical Specifications
The Allen‑Bradley 1756‑L84E offers a robust set of technical features tailored for advanced industrial applications.
User Memory: 20 MB for standard control logic, data tables, and application programs.
Non‑volatile Memory: Supports 1784‑SD2 2 GB Secure Digital card for expanded program storage and long‑term data retention.
Communication Ports: One 1 GB Ethernet/IP port (10/100/1000 Mbps) and one USB 2.0 port (12 Mbps).
Maximum Digital I/O: Supports up to 128,000 discrete I/O points for large‑scale systems.
Maximum Analog I/O: Handles up to 4,000 analog I/O channels.
Supported Networks: EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SynchLink, and third‑party networks.
Ethernet Nodes: Supports up to 250 nodes on the embedded Ethernet network.
Tasks: Unlimited task capacity via local I/O event triggers.
Programming Software: Requires Studio 5000 Logix Designer Application Version 3.0 or later.
Integrated Motion: Supports integrated motion control over the EtherNet/IP network.
Electrical & Power Parameters
Understanding the power characteristics of the 1756‑L84E ensures reliable integration into your ControlLogix system.
Current Draw (1.2V DC): 5.0 mA – minimal load on the backplane.
Current Draw (5.1V DC): 1.20 mA – exceptionally low consumption for a high‑performance controller.
Power Dissipation: 6.2 W – moderate heat output suitable for standard cabinets.
Thermal Dissipation: 21.2 BTU/hr – easily managed within typical industrial enclosures.
Isolation Voltage: 50 V continuous – provides basic insulation between USB port‑to‑backplane, Ethernet port‑to‑backplane, and USB‑to‑Ethernet. Tested at 1000V AC for 1 minute.
Enclosure Type: Open‑style (none) – designed for installation inside a protected ControlLogix chassis.
Energy Storage: Utilizes a built‑in capacitor‑based energy storage module, eliminating battery replacement.
Mechanical & Environmental Parameters
The 1756‑L84E is engineered to withstand harsh industrial conditions while maintaining exceptional performance.
Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F) – operates without de‑rating.
Storage Temperature: -40 °C to 85 °C (-40 °F to 185 °F) for safe warehousing.
Relative Humidity: 5% to 95% non‑condensing – suitable for humid factory floors.
Shock Resistance: 30 g peak acceleration for 11 ms – meets rigorous industrial standards.
Vibration Resistance: 2 g at 10‑500 Hz – ensures stable operation near heavy machinery.
Weight: Approximately 0.394 kg (0.87 lbs) – lightweight and easy to handle.
Slot Width: Occupies exactly one slot in any 1756 series chassis.
Temperature Code: T4 rating for safe operation in various environments.
Compatible Chassis: Fits all ControlLogix 1756 chassis, including A4, A7, A10, A13, A17, and their K‑versions (Series B and C).
Supported Power Supplies
The 1756‑L84E is compatible with a wide range of standard and redundant power supplies:
Standard Power Supplies: 1756‑PA50, PA72, PA72K, PA75, PA75K, PB50, PB72, PB72K, PB75, PB75K, PH75, PC75.
Redundant Power Supplies: 1756‑PA75R, PA75RK, PB75R, PB75RK, PSCA2, PSCA2K.
Installation Guidelines
Proper installation of the Allen‑Bradley 1756‑L84E ensures optimal performance and system reliability.
Chassis Slot: Insert the controller into any available slot within a ControlLogix 1756 chassis. The module is exactly one slot wide.
Backplane Connection: The controller automatically interfaces with the chassis backplane for high‑speed data exchange with I/O modules and communication adapters.
SD Card: For expanded non‑volatile memory, install a 1784‑SD2 2 GB SD card into the dedicated slot. This provides long‑term program storage and data backup.
Ethernet Wiring: Use shielded CAT5e or CAT6 cables for the 1 GB Ethernet port to maintain signal integrity at gigabit speeds.
USB Access: The front USB 2.0 port allows direct connection to a programming workstation for online editing and firmware updates.
Grounding: Ensure the chassis is properly grounded to prevent electrical noise interference.
Power Supply Selection: Choose a compatible power supply from the list above, verifying that total backplane load does not exceed the supply capacity.
Software Requirement: Use Studio 5000 Logix Designer Version 3.0 or higher for configuration and programming.
Packaging List
Each new 1756‑L84E unit includes the following items in the box:
1 x Allen‑Bradley 1756‑L84E ControlLogix 5580 controller module
1 x Built‑in energy storage module (pre‑installed, non‑removable)
1 x Bus lever assembly for chassis installation
1 x Product documentation quick‑start guide (printed)
1 x Anti‑static protective packaging bag
Note: SD cards (1784‑SD2), communication cables, power supplies, and mounting hardware are sold separately.
Shipping & Delivery
All orders for the 1756‑L84E are processed and dispatched within 24 hours of payment confirmation. We ship globally using FedEx, UPS, or DHL based on your regional preference. Tracking numbers are provided via email once the shipment leaves our warehouse. Standard delivery time is 3‑7 business days for most destinations, with expedited shipping options available upon request.
Frequently Asked Questions (FAQ)
1. Does the 1756‑L84E require a battery to retain program memory?
No, the 1756‑L84E uses a built‑in energy storage module (capacitor‑based) that eliminates the need for batteries. This design prevents data loss during power interruptions and reduces maintenance costs.
2. What is the maximum number of I/O points supported by the 1756‑L84E?
The Allen‑Bradley 1756‑L84E supports up to 128,000 digital I/O and 4,000 analog I/O points, making it suitable for very large and complex automation systems.
3. Can the 1756‑L84E communicate with third‑party devices?
Yes, the 1756‑L84E supports multiple communication protocols including EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, and SynchLink. It also interfaces with various third‑party process and device networks.
4. What software is required to program the 1756‑L84E?
This controller requires Studio 5000 Logix Designer Application Version 3.0 or later. It supports programming in Ladder Diagram, Structured Text, Function Block Diagram, and Sequential Function Chart.
5. Is the 1784‑SD2 card mandatory for operation?
No, the 1756‑L84E can operate without the SD card using its built‑in 20 MB user memory. However, the 1784‑SD2 provides expanded non‑volatile storage for larger programs, data logging, and firmware updates.
