Introduction
Links are vertical and horizontal connections between FFBs.
Attention should be paid to the following programming information:
Links can be used for every data type.
The data types of the inputs/outputs to be linked must be the same.
Several links can be connected with one FFB output. However, only one may have an FFB output.
Only inputs and outputs can be linked together. A link between several outputs cannot be made. This means that OR links are not possible using links in FBD. An
OR
function should always be used.An overlap of links with other objects is permitted.
No loop can be configured with links because in this case the execution sequence in the section cannot be clearly determined. Loops must be terminated with actual parameters (see Terminating loops).
To avoid links crossing each other, links can also be represented in the form of connectors.
Selecting links
You have the following options to activate the placement mode:
Use the
menu command.Press the F6 key.
or
Select the
symbol.
The and
cursor symbols indicate which mode is active.
Representation
The link points are identified by a filled-in circle.

Crossed links are indicated by a "broken" link.
