3. Overview of the OMRON FB Library
3. Overview of the OMRON FB Library
The OMRON FB Library is a collection of predefined Function Block files provided by Omron. These files are
intended to be used as an aid to simplify programs, containing standard functionality for programming PLCs
and Omron FA component functions.
3-1. Benefits of the OMRON FB Library
The OMRON FB Library is a collection of function block examples that aim to improve the connectivity of the
units for PLCs and FA components made by Omron. Here is a list of the benefits to be gained from using the
OMRON FB Library:
(1)No need to create ladder diagrams using basic functions of the PLC units and FA components
More time can be spent on bespoke programs for the external devices, rather than creating basic
ladder diagrams, as these are already available.
(2)Easy to use
A functioning program is achieved by loading the function block file to perform the target functionality,
then by inputting an instance (function block call instruction: invocation) to the ladder diagram
program and setting addresses (parameters) for the inputs and outputs.
(3)Testing of program operation is unnecessary
Omron has tested the Function Block library. Debugging the programs for operating the unit and FA
components for the PLCs is unnecessary for the user.
(4)Easy to understand
The function block has a clearly displayed name for its body and instances. A fixed name can be
applied to the process.
The instance (function block call instruction: invocation) has input and output parameters. As the
temporary relay and processing data is not displayed, the values of the inputs and outputs are more
visible. Furthermore, as the modification of the parameters is localised, fine control during debugging
etc. is easier.
Finally, as the internal processing of the function block is not displayed when the instance is used in
the ladder diagram, the ladder diagram program looks simpler to the end user.
(5)Extendibility in the future
Omron will not change the interface between the ladder diagram and the function blocks. Units will
operate by replacing the function block to the corresponding FB for the new unit in the event of PLC
and the FA component upgrades, for higher performance or enhancements, in the future.
OMRON FB Library
It is not necessary to create the
basic communications program.
A fixed name can be named to the processes.
INPUT/OUTPUT data is clear.
Parameters are easy to understand and edit.
