As shown in the section Task 1 - Creating the Step 7 program for Feeder, the plug-socket principle will be used to insert the FB_Insert, FB_Move, and FB_Inspect function blocks in the FB_Sequence function block. The plug parameter for the Step7 discipline is always assigned the name Caller. As a value, the plug parameter contains the name of the block in which the call is to take place. In this example, this is FB_Sequence.
TheCaller parameter is created in the Parameter unit.
1. Select the Parameter unit.
- From the shortcut menu, select New > Parameter.
- Enter Caller in the Name field.
- In the Type field, enter the text Plug.
The new parameter is listed in the Parameter unit once it has been saved.