Profibus, Canbus and Modbus

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What is the difference between Profibus, Canbus and Modbus?

Quick. In twenty words or less can you explain to somebody having trouble with arithmetic the difference between linear algebra, Boolean algebra and algebraic operator transformations?

This is the type of question you've asked here. I could have instead used different human languages or human religions and philosophies to make my point. To accurately answer your question requires first a lot of preliminary education to understand the vernacular so that a valid answer can be understood. Since you've already googled your question and cannot understand the answer you found I suspect you require that preliminary education.

The very simplest analogy I can give you is that these protocols are like different currency types (dollar, pound, yen, euro) of money between mindless merchants. If the teller window you bring your currency like instructions handles that currency then an accurate transaction can happen. The teller will not accept any other currency types than what it has been programmed to accept. Now a merchant may have multiple tellers that can be configured for different currency. You still must bring the correct currency to the correct teller. That multi-currency merchant can exchange currency types but this always has a price of taking more time and possibly confusing the instruction.

Dear questioner

These three items are similar in application but have different protocol and for this mention we have to use different hard ware .for example in many types of inverters we have MODBUS network,in some brands of PLCs we have separat cart for each one.so it depend on equipment and accessories .