Differences between Siemens 400 series cards and 300 series
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I have a question: visually, cards such as the 400 series AI cards appear to be larger than the 300 series cards, and they are installed in different racks. What are the differences between the 400 series and 300 series cards in terms of functionality or other aspects? Or rather, what are the advantages of the 400 series over the 300 series?
400 is one tier higher than 300; its price is not just one tier higher； 400: Channel isolation and channel diagnosis; 300: 2/4 channel isolation and card diagnosis ； High-end 300 series cards also come with channel isolation, but they are generally not recommended for use in China; moreover, their high price eliminates the advantage of using the 300 series due to its lower cost
CPUs with a rating of 400 usually have more memory; if you use one with a 400 rating, it’s better to go with 512K of memory； The CPU speed is just average compared to 300. The newly released 6ES7 315-2AH14-0AB0 has a work memory of 256KB; its performance is 0.05ms per 1000 instructions, which is also quite good.
There seems to be an improvement in signal isolation; with the 300 analog card, if one terminal is grounded, the entire card stops working, and it’s necessary to remove and reinsert it.