Now You Can Have Robust Data Logging for Free – Part 10
Computer Web Server (IIS)
We have come a long way. The PLC program has been written. The visual basic program has been written. Information is now being collected from the Do-more PLC via Modbus TCP and stored in a database using visual basic.
The next step is to deliver the information on the network. We will do this by installing Internet Information Services. (IIS) This is a group of internet servers that include a Web or Hypertext Transfer Protocol server (HTTP) and a File Transfer Protocol server (FTP). IIS will allow us to connect the physical hardware to the data. This could be desktop computers, laptops, tablets, cell phones, watches, etc. The advantage of using HTTP is that we can share the information with all of these devices without having to be concerned over the operating system of each of them. As long as they can display a web page we are good to go.
Active Service Pages (ASP) will be installed at the same time. This is a program that will run scripts at the server before delivering the HTML code to the browser. It is similar to CGI and Perl but is simpler and faster. ASP.Net Tutorial
We will install this on a Windows 8.1 machine.
Call up the Control Panel.
Swiping in from the right and searching for “control panel”.
Win + x will call a menu to select the control panel.
Select Programs and Features
Select Turn Windows features on or off
Select ASP after expanding Internet Information Services / World Wide Web Services / Application Development Features. This will select all of the other options.
Hit OK to install the services.
We now have IIS installed.
Under the following default directory, you will find the location to put your web pages.
If you call up the iisstart.htm file in this directory it will call up a page from Microsoft to explain the IIS web service.
Installing IIS on windows 7 and XP is very similar to the above procedure. Windows 98 you had to install a personal web service (PWS) and then ASP separately.
Further information on ASP can be obtained from the following website:
If you’re like most of my readers, you’re committed to learning about technology. Numbering systems used in PLC’s are not difficult to learn and understand. We will walk through the numbering systems used in PLCs. This includes Bits, Decimal, Hexadecimal, ASCII and Floating Point.
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