As we have now powerfull S7 300 plc's as the 319 PN, what still considers you to choose S7 400?
In my experence I know that towards communication S7 400 is more powerfull. In the 300 all the rack IO is connected to the bus mpi. Also when you have an ethernet card, the bottleneck will be the backplane. And in bigger plants where you have lots of IO's you might want to split up your profibus network into different networks using profibus master cards on the backplane, however also here the backplane will be the bottleneck. For a new installation I am considering for these reasons using S7 400.
One drawback will be the price I guess. What could be the difference in price between 319 PN and an 400 with comparabele memory and onboard pn?
Why do you choose S7 300 or 400 in your projects?
In my experence I know that towards communication S7 400 is more powerfull. In the 300 all the rack IO is connected to the bus mpi. Also when you have an ethernet card, the bottleneck will be the backplane. And in bigger plants where you have lots of IO's you might want to split up your profibus network into different networks using profibus master cards on the backplane, however also here the backplane will be the bottleneck. For a new installation I am considering for these reasons using S7 400.
One drawback will be the price I guess. What could be the difference in price between 319 PN and an 400 with comparabele memory and onboard pn?
Why do you choose S7 300 or 400 in your projects?