Dear,

I plan to connect two CPUs 414-5H to redundancy for Tunel (the distance between the PLCs is about 4 km) and connect with 50 ET200s modules (of course they are not redundant) but are in the ring. The link between ET200S is an optic or PROFINET. One ET200s has about 10  4xDI cards, 3 4xDO relay and 3  2xAI card.

Is this connection possible to the image?

Best regards

Hello FM_Merse1;

There are 2 issues you should be considering at this point:

- first, the maximum length of the synhronization cables for a S7-400H CPU is 10 km, see attachment below, nd the following manual:

https://support.industry.siemens.com/cs/ww/en/view/82478488

You should start a Support Request (see the link above) to request input from Siemens techs, and see if they have a suggestion on connecting for longer distances between H-CPUs.

- second, the ET 200S system does not ptovide redundant connection to S7-400H cPus; you need to connect them between Y-Links. See this discussion for example:

https://support.industry.siemens.com/tf/WW/en/posts/redundanncy-in-et-200s/17900?page=0&pageSize=10

So either you redesign your application with Y-links (with a max. of 31 stations behnd each Y-Link) or you switch to ET 200M stations.

Hope this helps,

Daniel Chartier

Thank you for fast answer,

-the distance between the 414H PLCs is less than 10 km.

- the thing is that I don't need redundancy between the ET200s units at all, just  the CPU is in redundancy. It's not a big problem if  one of the ET200s  is damaged or in fault...

My question is this configuration  possible regardless of  disadvantages, is it supported?

Best regards,

Dear,

You can have up to 256 PNIO devices at the controller.

https://support.industry.siemens.com/cs/ww/en/pv/6ES7414-5HM06-0AB0/td?dl=de

So: Yes, this is possible.

If you are going to plan a new application and you are not sure about quantity structures or a best practice solution, then you can always also seek help at your Siemens contact person (http://w3.siemens.com/aspa_app/) who can help you or forward the request to the so called 'presales support'; guys which are planning applications all day.