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Copy| Product Name | Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP ControlLogix 5580 Process Controllers |
| Item NO. | 2928067 |
| Weight | 0.1 kg = 0.2205 lb = 3.5274 oz |
| Category | ALLEN-BRADLEY |
| Brand | ALLEN-BRADLEY |
| Creation Time | 2026-10-29 |
Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP are ControlLogix 5580 process controllers built for PlantPAx-style process execution in a 1756 chassis. They run control strategies, coordinate chassis and EtherNet/IP I/O, and expose controller data to operator and supervisory systems through the embedded network interface.
Process tasking on Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP organizes periodic control routines and PlantPAx process instructions around deterministic update rates. The controller can remain in any standard chassis slot while the chassis backplane links local modules and the Ethernet port reaches distributed devices.
Capacity scales across Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP from 3 to 40 MB of memory and from 100 to 300 EtherNet/IP nodes. OPC UA capacity is not included in the L81EP, while L83EP and L85EP provide progressively larger OPC UA node counts for direct information exchange.
| Technical item | 1756-L81EP | 1756-L83EP | 1756-L85EP |
|---|---|---|---|
| Brand | Allen-Bradley | ||
| Product Name | ControlLogix 5580 Process Controller | ||
| Country | United States | ||
| User Memory | 3 MB | 10 MB | 40 MB |
| EtherNet/IP Nodes | 100 | 250 | 300 |
| OPC UA Nodes | Not provided | 1,200 | 15,000 |
| Controller Tasks | 32 | ||
| Digital I/O Capacity | 128,000 | ||
| Analog I/O Capacity | 4,000 | ||
| Ethernet Interface | Embedded | ||
| Removable Storage | 1784-SD4, 4 GB | ||
| Slot Width | 1 | ||
| Power Dissipation | 6.2 W | ||
| Weight | Approx. 0.394 kg | ||
Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP keep process execution, controller data and information services organized so control routines are not reduced to one undifferentiated program scan.
Periodic tasks give control strategies defined update intervals, while event and continuous tasks handle work with different urgency. This lets a slower supervisory routine coexist without setting the timing of every process loop.
Controller tags, program tags, process objects and reusable instructions share the selected controller memory but retain separate program roles. A larger application can therefore add strategies and data structures without changing the backplane relationship to the chassis I/O.
Where OPC UA is enabled, selected controller data is exposed as structured information for authorized clients. The project determines which information is published, while the control routines continue to execute inside the controller.
Local 1756 modules exchange input and output data over the backplane while the controller schedules the related process routines.
Remote I/O and process devices use EtherNet/IP ownership and produced/consumed data to join the same application.
Controller tags, alarms and process instruction states provide the HMI with the values needed to distinguish process condition from controller condition.
Estimate the complete process application, tag database, communication data and online-change margin before choosing Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP.
Within Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP, the L83EP and L85EP list OPC UA node capacity; the L81EP does not.
Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP are one-slot chassis controllers and can occupy an available supported 1756 chassis position.
For Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP, review periodic task rates, instruction execution load and communication updates rather than increasing every loop rate together.
Before migration to Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP, confirm chassis, firmware, network node count, memory, storage card and every module profile.
Allen-Bradley 1756-L81EP / 1756-L83EP / 1756-L85EP use controller nonvolatile storage and the specified 4 GB SD card for application storage and transfer according to the project procedure.
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