Normally Open Contacts, as well as normally closed contacts and analog inputs represent the input terminals of a IDEC SmartRelay module.
A pop-up window opens when you place the contact into your circuit diagram. In this dialog, you can specify the type of input according to the IDEC SmartRelay used. The cursor keys are also available as inputs as are the Text Display function keys if you have a Text Display module. You can also select a fixed logical level for the input.
To change an input in your LAD circuit diagram, double-click on the corresponding block to open the relevant pop-up dialog.