Earlier this month the widely used ControlLogix Ethernet module, part number 1756-ENBT, had it's status updated to “end of life” on Rockwell's Product Lifecycle Status page.

The product is now listed as going out of production in roughly 18 months, on December 31st, 2016.

1756-ENBT Goes Silver

The seemingly logical choice to replace the 1756-ENBT would be the newer and more capable 1756-EN2T.

Compared with the ENBT’s 64 TCP & 128 CIP connections, and 5000 I/O Packets per second limit, the EN2T is far superior with 128 TCP & 256 CIP connections, as well as supporting between 10,000 and 25,000 I/O Packets per second.

All versions of this newer module include a USB port for access to the module's own configuration, as well as to the rest of the ControlLogix system.

This allows programming and configuration of interconnected devices, including the EN2T's own Ethernet address.

The EN2T includes other enhancements over the ENBT, with one of the most versatile being Open Sockets support.

With a free AOI from Rockwell’s sample code website, users can quickly enable Modbus TCP communications over the EN2T using the open sockets feature.

1756-EN2TOpen sockets can also be used for interfacing with Ethernet based printers, bar code readers, and RFID systems.

On the down side, the 1756-EN2T currently carries a published list price 20% greater than the ENBT, which itself has seen a 20% price increase over the last few years.

And the EN2T, with it’s substantialy larger connection limit and packets per second rating, seems a little over powered for smaller systems or when used as a remote Ethernet I/O adaptor.

Hopefully Rockwell realizes this and will release a new lower cost and lower functionality Ethernet module prior to the ENBT’s last day of production.

I hope you found the above article about the ENBT's end of life announcement helpful.

If you have any comments, questions, or suggestions please feel free to share them by filling out the “post a comment or question” form below.


Shawn Tierney
Automation Instructor and Blogger
If you enjoyed my article, you may like my courses at TheAutomationSchool.com

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  1. Good afternoon DMartin,
    It's common to build new systems with the new EN2T in place of the ENBT, and as the EN2T has more throughput than the ENBT I've never seen an issue using it in place of the ENBT.
    But in old versions of Logix we could not drag and drop I/O from one Ethernet module to another, so we use to delete everything under the old module, delete the old module, add the new Ethernet module with the same name as the old module, and then add all the devices back in. The other option was just to disable keying.
    That said, with newer versions of Logix I believe you can drag and drop the I/O from your ENBT to your EN2T right in the I/O tree.
    Good luck,
    Shawn Tierney,
    Instructor, The Automation School
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Shawn Tierney
Shawn began sharing automation news and know-how online in 1996 when he launched his first BBS. Then in 1999 he moved to the internet launching ShawnMichael.com, which he later renamed ShawnMTierney.com. In 2013 he moved his automation efforts to a new website, TheAutomationBlog.com, which has since become the most popular independent industrial automation blog on the web. Today Shawn works full time teaching online courses on Programmable Controllers, HMI, and SCADA on his training website, TheAutomationSchool.com.