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What is the deffrence between Siemens S7-300 & S7-400 PLC?
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Answer Posted / taj
Siemens rates the S7-300 as a medium level PLC, and the S7-400 as a high-level PLC. So there are differences in work memory, processor speed, number of communication links and I/O connectivity.
First point, the S7-400 family is rack-based (Multi-pin backplane linking all modules, from power supply to I/Os) whereas the S7-300 is a bus-linked platform (a serial connector links all modules). So essentially the physical layout limits the S7-300 back[plane exchanges to MPI speeds (187,5 Bits per second), whereas the S7-400 uses parallel connections over the backplane rack, permitting higher exchange rates, and a higher module-density.
Second point, the form factor of the S7-300 is smaller, more compact than the S7-400, so this is something to take into account if space is a premium (inside a small machine panel, for example).
Now, the higher S7-300 CPUs (especiatlly for the new S7-317 and S7-319)have specs that approach (and sometimes pass) the specs of lower end S7-400 CPUs, so the distinction is starting to blur.
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