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Siemens, Allen Bradly and mitsubishi are main PLC's which are widely used in the industry .
This is really a hard question to answer as it depends on the region you are in.
If you are in Europe then the competition is between SIEMENS and Schneider Electric. If you are in America then the competition is between Allen Bradley (Rockwell) and GE. If you are in the Middle East then you can't judge as this market is opened for all players and depends on the local agent or representative of the manufacturer.
For example, here in Egypt, Schneider and SIEMENS are almost equally sharing the first place then comes Allen Bradley.
In KSA Schneider comes first in the water sector while SIEMENS doesn't have that strong presence.
And so on.
Allen Bradly
Seimens
ABB
Mistubishi
Honeywell
Siemens is most commonly used PLC in industry
Siemens and Allen Bradley is commonly used in idustry
Siemens, Allen Bradley, Omron , Delta , Ls, ABB, Cimon
Siemens and Allen Bradley are the most used PLC's in the industries.
Siemens and Allen Bradley Brand PLCs mostly used in Industry
ABB SIEMENS GE are the commonly used plc's in thermal power plant.
Siemens,Mitshibushi and Allen bradely.