BECKHOFF KL6904 - Manual (Page 32)

Operation
30 KL6904
4.2.8 Append a function block
The KL6904 TwinSAFE logic terminal features the following blocks: Emergency Stop, Machine
Monitoring, AND, OR, Decoupler, Operation Mode, etc.
A function block is added by right-clicking on the associated TwinSAFE function block list in the tree
structure and selecting Append Function Block in the dialog box with the left mouse button (see diagram).
The required function block can then be selected from the following window.