Rockwell releases MicroLogix 1000 to Micro800 conversion tool

Earlier this week (in this article) we covered the “MicroLogix 1000 to Micro800 Migration Guide” which Rockwell released shortly after announcing the 1000 and 1500 had been re-classified as “End of life.”

At the same time, Rockwell also released a “MicroLogix 1000 to Micro800 Converter Tool” for use with Connected Components Workbench (CCW) version 8.0, and in today's article we'll take an introductory look at this new utility.

The “MicroLogix 1000 to Micro800 Converter Tool” is currently available for download from Rockwell's product compatibility and download center webpage, and once installed is available inside of CCW under the “Tools” menu.

To take advantage of this new tool, users need to first save their MicroLogix 1000 projects as an .SLC file which they can then import into CCW.


At first glance the tool seems to work seamlessly, but upon closer inspection it becomes obvious that maintaining compatibility does require additional code which that the tool automatically adds to imported programs.

MicroLogix-to-Micro800-Conv-Tool-RA-UDFBThis additional code, represented by User-Defined Function Block (UDFB) programs, is used to replicate the functions of MicroLogix instructions which differ from their Micro800 counterparts.

One example is the MicroLogix's TON instruction.

When a program containing this instruction is imported into CCW, an “RA_TON_MicroLogix” UDFB is automatically created to mimic the MicroLogix TON's operation inside of the Micro800.

So while the imported Micro800 ladder program does look like it's RSLogix counterpart, it is only accomplished with the additional code found in these automatically generated UDFB's.

Another item of note is how MicroLogix ladder program files are imported.

MicroLogix-to-Micro800-Conv-Tool-Sub-UDFBsAs would be expected, the MicroLogix project's main ladder file, file 2, is converted to the main program in the Micro800.

And the three interrupt program files, files 3-5 (HSC, STI, and Userfault,) are also converted to the equivalent Micro800 interrupt programs in the CCW project.

However, all sub-routine program files, files 6-15, are converted to UDFB's which are then called in place of previously used subroutines.

For more information about converting MicroLogix programs to Micro800s, check out Rockwell's “MicroLogix to Micro800 Migration Guide” available from the link below:

I hope you've found this article about Rockwell's new “MicroLogix to Micro800 conversion tool” helpful.

If this is a subject of interest to you, note that in the coming days I'll be posting additional articles on this topic.


Shawn Tierney
Automation Instructor and Blogger

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Shawn Tierney

Shawn began programming as a pre-teen in the early 80's, and later earned a degree in Electronics. He worked for 25 years as Automation Specialist, passionately sharing tech tips via his newsletter, then his BBS, before launching his first website in 1999. In 2013 he relaunched his website as, and now teaches full time at

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