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that's right thanks
more powerful more redundant and more inputs outputs
The S7-300 is considered a mid-level controller, using a serial bus (the modules are connected through a bus connector), with lower memory size and lower transaction speeds than their S7-400 counterparts. They come in a smaller footprint that the S7-400s. The S7-400 CPUs are generally more powerful and faster than the S7-300, and use a rack-based parallel bus that allows faser comms between the CPU and its modules. The S7-400 is the only Siemens CPU that can be mounted in a hot-redundant (hardware) configuration (with specific CPUs involved here, known as S7-400H systems).
Dear Hossam,
The PLC S7-300 is a medium level PLC, but the S7-400 is a high-level PLC.
There are differences between them in memory, processor, number of communication links and I/O connectivity.
http://www.automation.siemens.com/forum/guests/PostShow.aspx?PostID=155043&Language=en&PageIndex=1
The PLC S7-300 is cheaper and less powerful.
And about the PLC S7-400 is more powerful and higher level and in some applications to reduce the cost you can use PLC S7-400 CPU & communication cards and connect it to PLC S7-300 extension rack including a communication card and the I/O cards that you need to gain the benefits of the powerful CPU and minimize cost by using cheap I/O cards.
s7400 higher than s7300
i am not sure dear
s7400 is higher than s7300
