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By Calculating IO'S (PLC IO CONFIGURATION) and by going through the Application Requirement such as Communication Protocols/Modules, Power supply Requirment,Processor Capability,Memory Requirement and Ruggedness of PLC depending on Site Conditions.
All PLC's has got its own data sheet showing its specifications. Like I/O counts, communication Protocol, types of applications etc. its available with the plc or in the concerned company website.