What is meaning and purpose of Hot swappable?

Hi, All

Question # 1

What is meaning and purpose of Hot swapable? 

[snip]

Waiting for your kind response.

Thank you

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Split from S7-300 setup 4 racks or 5 racks?.

New question published by Ahtisham54 is split to a separate thread with the subject What is the maximum number of remote racks the S7-300 PLC can have?.

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Jen_Moderator

Ahtisham54

Hi, All

Question # 1

What is meaning and purpose of Hot swapable? 

[snip]

Waiting for your kind response.

Thank you

------------------------------------------------------------------------------------------
Split from S7-300 setup 4 racks or 5 racks?.

 Hello Ahtisham;

The idea behind a "hot swap" is the possibility for an I/O module to be removed and replaced while it is still powered-up  and connected to the CPU. The CPU should remain active  during this operation  without declaring a fault.

PLCs that offer such a functionnality generally use a bsckplane to connect the CPU and the I/O mobules. A S7-300 CPU (since the other questions you ask refer to this family of CPUs) does not have a backplane structure , the I/O modules are connected using a U-connector. The S7-300 cannot use hot-swap functionality. 

In some special configurations a S7-300 can use so-called "active bus connectors" to use as a backplane, for redundancy topologies for example. But even then the S7-300 does not support hot-swapping, it does not have the required OB83 in its firmware. See the following discussion, Ayman Elotaify's answer is correct and very detailed.

https://support.industry.siemens.com/forum/ca/en/posts/hot-swap/67961

Hope this helps,

Daniel Chartier 

Thanks Danial

You explained briefly i understood the purpose of hotswap.

could you please explain us more with examples  or with any scenario and on which cases do we need to perform hotswapping?

Hello Ahtisham;

S7 PLCs refer to "hot-swap" of modules as CiR (Configuration in Run). Here is one example provided by SIOS for CiR on a Profinet system:

https://support.industry.siemens.com/cs/ca/en/view/109770841

To locate more articles on applications for CiR, simply use the search box at the right of this page, use the search term "CiR". Once the SIOS page opens  use the Knowledge Base filter to find documents such as you can see in the attached screenshot. The Forum filter will show requests for help from users wanting to implement CiR on different CPUs, and answers provided by members of the forum.

Hope this helps 

Daniel Chartier