How to break into SCADA?

I hear a bit about SCADA but haven't seen any resources to get to know them better. Anybody have some recommendations?
These articles and posts are my own opinion and do not reflect the view of my employer.
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DHS https://ics-cert-training.inl.gov/lms/
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If evil be spoken of you and it be true, correct yourself, if it be a lie, laugh at it. - Epictetus
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The last one I worked on was a Siemens product with active support. The support guys I spoke with several times said they usually need a few tries to get it (initial setup) right...not inspiring.
Ha that's a bummer. I'll have to do some research. I like the odd machines that we can add into a network.
Website gave me error for signature, check out what I've done here: https://pwningroot.com/
The good news is they are usually very crude/rudimentary. The machine I was working on was $35K and ran on Windows NT 4.0, which was nice because there is 20 years worth of "rigging and hacks" to make things worth with that OS.