N.O. contact

For normally open contacts, the status of the left link is copied to the right link, if the status of the relevant Boolean actual parameter is 1. Otherwise, the status of the right link is 0.

Objects > Normally open contact

or

Edit > New > Normally open contact

or

Contacts > Normally open contact in the shortcut menu

F3

N.C. contact

For normally closed contacts, the status of the left link is copied to the right link, if the status of the relevant Boolean actual parameter is 0. Otherwise, the status of the right link is 0.

Objects > Normally closed contact

or

Edit > New > Normally closed contact

or

Contacts > Normally closed contact in the shortcut menu

Shift+F3

Positive transition contact

With contacts for detection of positive transitions, the right link for a program cycle is 1 if a transfer of the relevant actual parameter goes from 0 to 1 and the status of the left link is 1 at the same time. Otherwise, the status of the right link is 0.

Also see the Edge recognition in the user guide.

Objects > Positive transition-sensing contact

or

Edit > New > Positive transition-sensing contact

or

Contacts > Positive transition-sensing contact in the shortcut menu

Ctrl+F3

Negative transition contact

With contacts for detection of negative transitions, the right link for a program cycle is 1 if a transfer of the relevant actual parameter goes from 1 to 0 and the status of the left link is 1 at the same time. Otherwise, the status of the right link is 0.

Also see the Edge recognition in the user guide.

Objects > Negative transition-sensing contact

or

Edit > New > Negative transition-sensing contact

or

Contacts > Negative transition-sensing contact in the shortcut menu

Ctrl + Shift + F3