I would love to hear how you’re using this site, and how it may or may not have helped you. I see lots of daily traffic from all over the world, which is awesome, so I would love for you to drop me a quick note!
I’ve changed the requirements to leave comments, so you no longer need to leave your email address if you don’t want to.
Looking forward to hearing from you.
-Mike
This Old Mill 
If you need parts or info on the 8400 MP or LP I support them.
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Dan, can you provide a link to your website or parts list? Thanks for chiming in!
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I found this very informative. I just got a mill but it doesn’t have the Allen Bradley controller. I still have to look at the make of controller. I found the wiring diagrams and info there very fascinating and informative since the mill had no documentation. It is a Supermax mill similar to yours from 1984 and from what I was told everything is fine except the computer module but I have a ton of cleanup, debug, rewiring to do. I have single phase power in my barn so that part of the post was most interesting to me as well. Thanks for taking the time to post your work.
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You’re welcome Paul! Thanks for taking time to comment. Good luck to you. Reach out if you run into trouble, I’ll try to help.
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Hi Mike. First of all, I really appreciate that you share everything you have done to modernize your old mill! I have an Allen Bradley 8400MP controller too, and I am trying to get to the Serial I/O page, however, it will not let me. It tells me, “Function not Allowed”. Do you know of a way past this?
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Thanks Charles! When you start the control up do you use the password “ABBP”? That’s the only thing I could think of keeping you out.
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