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Simple function block diagram

The Function Block Diagram (FBD) is a graphical language for programmable logic controller design,[1] that can describe the function between input variables and output variables. A function is described as a set of elementary blocks. Input and output variables are connected to blocks by connection lines.

Inputs and outputs of the blocks are wired together with connection lines, or links. Single lines may be used to connect two logical points of the diagram:

  • An input variable and an input of a block
  • An output of a block and an input of another block
  • An output of a block and an output variable

The connection is oriented, meaning that the line carries associated data from the left end to the right end. The left and right ends of the connection line must be of the same type.

Multiple right connection, also called divergence can be used to broadcast information from its left end to each of its right ends. All ends of the connection must be of the same type.

Function Block Diagram is one of five languages for logic or control configuration[2] supported by standard IEC 61131-3 for a control system such as a Programmable Logic Controller (PLC) or a Distributed Control System (DCS). The other supported languages are ladder logic, sequential function chart, structured text, and instruction list.

See also[edit]

References[edit]

  1. ^ R. W Lewis (2001) Modelling Distributed Control Systems Using IEC 61499. p. 9
  2. ^ W. Bolton (2011) Programmable Logic Controllers. p. 14

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Function_block_diagram — Please support Wikipedia.
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31 news items

 
PACE Today
Thu, 29 May 2014 22:36:44 -0700

Users can now select three of the five programming languages from the International Standard IEC61131-3; Function block diagram, Instruction List and Ladder Diagram, providing a higher level of usability and flexibility. Unique to the Pilz model, all ...

Ferret

Ferret
Mon, 03 Nov 2014 16:40:17 -0800

"The Connected Components Workbench Software is one of the reasons we decided to use the Micro800 series of PLCs; it's powerful, and code can be written in ladder, function block diagram or structured text," said Crabb. "The Micro 820s are great for ...

Assembly Magazine

Assembly Magazine
Wed, 01 May 2013 11:44:29 -0700

It includes the textual programming languages structured text and instruction list; the graphical programming languages ladder diagram and function block diagram; and the structuring tool sequential function chart. The goal of PLCopen is to enable ...

Automation World

Automation World
Wed, 23 Oct 2013 13:03:45 -0700

This IEC61131-3 control software includes five programming languages including: Ladder Diagram (LD), Function Block Diagram (FBD), Sequential Function Chart (SFC), Structured Text (ST), and Instruction List (IL). To further aid engineers, the ADAM-5560 ...
 
Business Wire (press release)
Wed, 06 Nov 2013 18:37:30 -0800

SAN JOSE, Calif.--(BUSINESS WIRE)--Epson Electronics America, Inc. (“EEA”) today began shipping samples of its new XV4001 series of high-precision digital-output gyroscopic sensors. These sensors are available with either an SPI or I2C digital interface.
 
Business Wire (press release)
Mon, 17 Jun 2013 03:52:30 -0700

The automation software Sysmac Studio supporting IEC 61131-3 programming language (function block diagram), as recommended by PLCopen, can be used all over the world. This usage drastically reduces the time required for designers to master design ...

Vision Systems Design

Vision Systems Design
Fri, 06 Sep 2013 12:18:45 -0700

This allows functions such as PatMax to be added as a graphical function block diagram in a sequence of functions that capture process, display and control machine vision processes (see "Vision framework supports multiple software packages," Vision ...

Automation World

Automation World
Tue, 11 Jun 2013 08:25:17 -0700

TIA Portal includes five IEC programming languages: ladder logic, function block diagram, statement list, a graphic programming editor for sequential steps, and SCL (structured control language). “The new SCL editor makes it very fast to write software ...
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