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This question was already asked and my reply was and is below:
When we come to PLC, it is best for batch processing or machine control, it takes lesser time and good control. But when we are talking about DCS, it is better in process control especially in non-stop/contrinuous processing.
The world is becoming small, DCS offers more varieties than PLC, and today PLC and DCS combining and automation is growing. In past PLC was not helpful when we face any trouble, it have to shutdown to change the program. But DCS produce intime change in program, means during the process, we can change the program according to our needs without stopping the process.
