Difference between s7 300 and s7 400

I know s7 400 is advanced plc compare to s7 300 plc. But how advanced ?

Hello umang;

Ten years ago,  the difference between the 2 families would have been evident: the S7-400 was considered a high-end controller, with higher processing speeds.larger number of I/Os.more communication interfaces and specialized modules than the mid-level S7-300.

Today,  these differences have been largely reduced. The newer S7-300 CPUs have comparable processing power and can use networks (Profibus and Profinet) to extend the number of controlled I/Os.

The only remaining factors distinguishing the two families are Hot Redundancy (S7-400H Systens) and PCS 7 (which is based on the S7-400 processors); thés features are not as easily available for the S7-300.

There are many threads on the subject on the forum,  search for them for further details. Here is one:

Difference between S7-400 and S7-300

https://support.industry.siemens.com/tf/ca/en/posts/32342 

Hope this helps, 

Daniel Chartier 

thanks Daniel chartier

additional to these, there are extra accumulators "accu3 & accu4" 

dchartier

Hello umang;

Ten years ago,  the difference between the 2 families would have been evident: the S7-400 was considered a high-end controller, with higher processing speeds.larger number of I/Os.more communication interfaces and specialized modules than the mid-level S7-300.

Today,  these differences have been largely reduced. The newer S7-300 CPUs have comparable processing power and can use networks (Profibus and Profinet) to extend the number of controlled I/Os.

The only remaining factors distinguishing the two families are Hot Redundancy (S7-400H Systens) and PCS 7 (which is based on the S7-400 processors); thés features are not as easily available for the S7-300.

There are many threads on the subject on the forum,  search for them for further details. Here is one:

Difference between S7-400 and S7-300

https://support.industry.siemens.com/tf/ca/en/posts/32342 

Hope this helps, 

Daniel Chartier