Creating a Program in LD for Application Execution
Original instructions
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At a Glance
This section controls the pump and the valve using the DFBs created earlier.
Illustration of the Execution Section
The section below is part of the MAST task. It has no temporary condition defined for it so it is permanently executed.
Description of the Application Section
When the Pump step is active, the Run input of the motor DFB is at 1. The Motor_run_cmd switches to "1" and the pump supply is activated.
The same principle applies to the rest of the section.
Procedure for Creating an LD Section
The table below describes the procedure for creating part of the Application section.
Step
Action
1
In Project Browser\Program\Tasks, double-click on MAST.
2
Right click on Section then select New section. Name this section Application, then select the language type LD.
The edit window opens.
3
To create the contact Init_Pump.x, click on then place it in the editor. Double-click on this contact then enter the name of the step with the suffix ".x" at the end (signifying a step of an SFC section) and confirm with OK.
4
To use the motor DFB you must instantiate it. Right click in the editor then click on Select data and on . Click on the Function and Function Block Types tab and select your DFB then confirm with OK and position your DFB. To link the Open_valve1.x contact to the stop input of the DFB, align the contact and the input horizontally, click on and position the link between the contact and the input.
NOTE: For more information on creating an LD section, refer to chapter LD Editor.