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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.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

28 news items

Machine Design

Machine Design
Mon, 01 Jun 2015 12:57:23 -0700

are switches while ( ) is the action command. Another programming language is function block diagram (FBD). It describes functions between input and output variables. The function, represented by blocks, connects input and output variables. FBD is ...

Assembly Magazine

Assembly Magazine
Thu, 04 Jun 2015 11:11:15 -0700

The system configuration tool uses a function block diagram format that consists of pre-engineered and pretested safety function blocks, as well as a set of Boolean functions. As the function block configuration is created, a corresponding logic ladder ...

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 ...
 
PACE Today
Thu, 29 May 2014 22:26:15 -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 ...

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 ...
 
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 ...
 
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.

Engineer Live

Engineer Live
Fri, 04 Mar 2011 01:42:54 -0800

As might be expected today, the Connected Components Workbench follows established IEC-61131 standards, supporting ladder diagram, function block diagram and structured text programming. It also enables machine builders to configure other devices in ...
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