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I believe that "stand alone" means not connected to other systems. Since you don't have DP (you need to buy additional module) or MPI on ET200S CPU can be considered not to be suitable for connection to the other systems. You can use it if you don't need some special modules which doesn't exist for...

Hello,what are the feasible conditions for selecting Simatic ET200S CPU??
In some article, I saw its better for stand alone systems..
here stand alone means redundant.
Isn't it??
Please explain it....thanks in advance...