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1756-L81EXT – ControlLogix 5580 XT Controller
1756-L81EXT is an Allen-Bradley ControlLogix / GuardLogix 5580 (1756-L8) catalog number. The ratings and the lifecycle status below are as shown on its Rockwell product page, read on 3 November 2026. TDL quotes it as a spare or for a project, and can carry out the installation, configuration and testing on site.
| Catalog number | 1756-L81EXT |
|---|---|
| Rockwell description | ControlLogix 5580 XT Controller |
| Memory | 3 MB |
| Ports | 1 embedded Ethernet port, 10/100/1000 Mbps |
| I/O, nodes | 100 EtherNet/IP Devices |
| Type | extreme |
| Rockwell lifecycle status | Active — sold and supported (read on 3 November 2026) |
| Product family | ControlLogix 5580 and GuardLogix 5580 controllers (1756-L8) |
Lifecycle status changes over time: confirm the current status on the Rockwell product page or in the Product Compatibility and Download Center before ordering.
About this product family
- Every ControlLogix 5580 controller has one embedded Ethernet port at 10/100/1000 Mbps.
- The ControlLogix 5580 range runs from 3 MB (1756-L81E) to 40 MB (1756-L85E) of user memory.
- GuardLogix 5580 controllers (1756-L8xES) are listed with the 1756-L8SP safety partner.
Other catalog numbers in this family
1756-L81EP 1756-L83EP 1756-L85EP 1756-L81EPXT 1756-L83EPXT 1756-L85EPXT 1756-L82EXT 1756-L83EXT 1756-L84EXT 1756-L85EXT 1756-L81ES 1756-L82ES
All 24 catalog numbers in the family table Current replacement parts ControlLogix in TDL Projects
Related services: Lifecycle review and spare parts Rockwell Automation upgrades
Sources
- Rockwell Automation, Rockwell product page 1756-L81EXT — read on 3 November 2026
- 1756-TD001W-EN-P (Oct 2025), pp. 18-19
- 1756-TD001W-EN-P (Oct 2025), p. 43