AC800M, Control Builder M. In this M stands for?
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ABB has several PLCs named Advant Controller 800.
AC 800M programmed with Control Builder M
AC 800PEC, a high speed variant of AC 800M, programmed from CBM with an addon
AC 800F programmed with Control Builder F (Freelance)
What the letter "M" actually stands for I don't know. The AC 800M PLC stem from Satt Control/SattLine (before ABB aquired the company some 15-20 years ago).