Stage 2: Developing the program code

In the second stage, the program code is developed in the IEC programming language LD (Ladder Diagram) in the graphic editor. Since the code body worksheet of our LD_POU is already opened we can immediately start editing.

Creating an LD network

The video about this stage demonstrates how you can simply...

Insert a first LD network into the worksheet consisting of a contact (C000) and a coil (C001).

Insert one variable each for the contact and the coil and declare it with the property dialog. Both variables are assigned to I/Os of the PLC, i.e. they are declared as physically addressed variables.
Insert an instance of the timer function block TON (Timer On-Delay) into the LD code worksheet using the Edit Wizard. As for the variables before, the FB instance name is also declared via dialog during insertion.
Insert a constant as delay time at the preset input of the timer.
Insert a variable at the output of the timer and declare it at the same time.

[Continue with stage 3]
[Details on MULTIPROG editors and wizards]

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