Industrial Automation Technologies

When I pay over one hundred pounds for a technical book, I expect the content to be informative and technical, this book is not informative or technical. The contents page is impressive to look at, but that's about it. I bought this book mainly because I thought it would explain SCADA and the various bus systems. The reality is that it briefly describes them and that is it. The writing is also poor with some sentences not making sense. Not worth the price, returned.