Implementing the PLC code

Now that we have a design, we can implement the code. The code implementation should be relatively minimal. The first thing we are going to do is declare our function blocks. For this, we are going to create a folder named FunctionBlocks and use it to house the Oven, Alarms, and Door function blocks. When all the function blocks and methods are implemented, your tree should look like this:

Figure 15.14 – Function blocks

Once you create the tree, you can start to implement the methods. The first set of methods you will want to implement are the methods of the PLC_PRG file.

PLC_PRG file

The first place we’re going to start implementing code is in the PLC_PRG file. Since it is our entry point, we’re going to put our starting logic here. In short, you should have your variables all implemented in the vars GVL at this point, except a reference variable for the Oven, Alarms, and Door classes, which will look...