Chapter 7

1. What are two programming languages that are similar to ST?

   In terms of PLC languages, the closes one would be Instruction List. Outside of PLC languages, one could say C/C++, Java, C#, Visual Basic, Ada, and so on.

2. What are the two sections of the PLC_PRG file?
   • The variable section
   • The logic sections
3. Why would you use ST over LL?

   ST provides and easy to use read interface that makes following the flow of a program much easier and can require less overall code.

4. What does the Value column represent?

   It shows the current value a variable is set to.

5. What is the process to run a PLC program in CODESYS?
   1. Put CODESYS in simulation mode.
   2. Click the login button.
   3. Press the play button.