In this example, let's configure an opening Command Unit of the position command of Switch 29-08, so that it informs that this Command cannot be sent if that Switch is already open. To do so, follow these steps:

1.Right-click the Open Command Unit of Command cmdSwitchPosition, on the Commands folder of Switch 29-08, which belongs to Bay1, and select the Add - Interlocks option.

2.Right-click the Interlocks folder and select the Insert - Interlock option.

3.Configure the Measurement property of this Interlock with the expression "SE1.Bay1.[29-08].Measurements.SwitchPosition", by using AppBrowser.

4.Configure the ComparisonValue property of this Interlock with the value 0 - Opened.

5.Repeat the previous steps for an Interlock on the Close Command, changing the value of the ComparisonValue property to 1 - Closed.

Inserting Interlocks

6.Execute this application and check this new functionality.

Switch Command