I saw this info several years ago somewhere, on a plc site or a controls magazine. I had wanted to know this myself.
As I remember, AB had over 50%. Siemans was a distant second (16%?), then GE Fanuc (8%?).
I would bet YOUR next paycheck on these numbers (but not mine!).
With AD raising in popularity, and other new players, I would expect a shift in the numbers if they were close at one time.
Omron has tremendous overseas sales, Entertron has been around over 25 years, then there are a lot of others (IDEC, crozet, TRI, etc.) that keep plodding along.
My guess for the top five would be:
Allen Bradley
Siemans
GE Fanuc
Omron
Automation Direct
I think the following round off the top ten (not neccessarily in order):
Moeller
Entertron
Mitsubishi
Schneider
Telemechanique (or whoever they are now)
With a couple of mergers and name changes, and the dozens of small companies, and the even smaller still companies, I could easily see a list of the top 100 plc manufactureres.
If you look at the "Learn PLC's" button, then the "Manufacturers Links" button, you will see a lot of names you probably have never seen hardware for, not counting the others that aren't listed.
Maybe we should start a thread with pictures of plc's "Name That PLC" for some of the oddball ones.
Now to google a search, and probably not find much. However, if it is out there, Eric will find it!
regards......casey