Dear all !
As per my gr8 interest in open source system,I have chosen a project "design and development of a secure and reliable open source HMI/SCADA system." My HMI system have to communicate and cater data of a plant where 100s of processes will be running simultaneously. I am not very sure which Linux distros will best meet my need. I am not interested in SELinux. I want to use PostgreSQL.

I will be more happy if your answer will include related support/support link for suggested Linux/Linux distros to give good startup to this project.

Will it be a good idea to choose centOS ??

In advance, Thank you..

SCADA: "Supervisory Control and Data Acquisition"

HMI: "Human Machine Interface"

The terms "Security" and "Reliability" mean something very, very different for a Linux-based SCADA system for, say, a nuclear generator than they might for a Linux system that runs an e-commerce site, or a home user's desktop

So the first questions are,

"What DO you mean by 'Security'?"

"By 'Reliability'?"

For example, do you need a realtime system (can you afford even a millisecond's latency?)

Do you require a distro that accomodates a "hardened" environment (as a nuclear generator would undoubtedly entail)?

Please be a bit more specific about your actual requirements. Most common distros are pretty equivalent. But the particulars about your specific requirements will help choose one over another.

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as extra this link might good for you
there one pdf you can download

FYI there is no so called secure and reliable permanently you need to work on it

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I am happy to read your responses. Certainly I missed to be elaborative. I am mainly interested to design and develop a open source HMI system partially oriented for nuclear application to get rid off proprietary based less secure,less stable, and costly HMI/SCADA system. Here security, reliability are necessary and real time response of the system is not very stringent.
Now, I am very sure that I have elaborated the topic to get the best assistance. I am waiting for your responses.

Again , In advance
Thank you

If you want to really rely upon the "secure" and "solid" , I would suggest FreeBSD rather than Linux distros