Choose the Function Block Elements

Choose the Function Block Elements

To control a device, use these elements:
fbd_elements
Use the following table to help you choose your function block elements:
If you want to supply a value from an input device or tag
Then use an input reference (IREF)
Send a value to an output device or tag
Output reference (OREF)
Perform an operation on an input value or values and produce an output value or values.
Function block
Transfer data between function blocks when they are:
  • Far apart on the same sheet
  • On different sheets within the same routine
Output wire connector (OCON) and an input wire connector (ICON)
Disperse data to several points in the routine
Single output wire connector (OCON) and multiple input wire connectors (ICON)
The function block moves the input references into the block structure. If necessary, the function block converts those input references to REAL values. The function block executes and moves the results into the output references. Again, if necessary, the function block converts those result values from REAL to the data types for the output references.
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