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Often, you will have to use the same piece of code in your PLC program multiple times. There are many standard function blocks provided in FBD.But you can also make your own function blocks. Here’s how a simple function block could look like:Ĭombining function blocks to make a basic function block diagram
The function of the block is the relation between the state of its inputs and outputs. They all have one or more inputs and outputs. In FBD all functions are put into function blocks. You still, most of the times, have to connect those functions. Because, even though you might write your functions in structured text. Most PLC programs are written with some amount of FBD. Thereby we can easily connect them, to make a bigger PLC program.Īs with ladder logic and structured text, function block diagrams or FBD is described in the standard IEC 61131-3 by PLCOpen. What FBD offers is a way to put functions written with many lines of code into boxes. PLC function block diagram is not that different from it. Make your own Function Blocks What is Function Block Diagram?įrom systems engineering you might already know something also called function block diagrams.In this tutorial I will introduce you to some of the basic principles of FBD programming and the function blocks. FBD is very useful when batch control concepts from ISA-88 are applied. And that is exactly what the concept of function block diagrams is. Most engineers love FBD because it is graphically a very common way to describe a system. It is a great way to implement everything from logic to timers, PID controllers, and even a SCADA system in your solution, etc. Function Block Diagram is easy to learn and provides a lot of possibilities.Īs one of the official PLC programming languages described in IEC 61131-3, FBD is fundamental for all PLC programmers. It is a simple and graphical way to program any functions together in a PLC program. One of the official and widely used PLC programming languages is the Function Block Diagram (FBD).