Block diagram

Block diagram

Block diagram is a diagram of a system, in which the principal parts or functions are represented by blocks connected by lines, that show the relationships of the blocks. [http://pascal.computer.org/sev_display/index.action SEVOCAB: Software and Systems Engineering Vocabulary] . Term: "block diagram". retrieved 31 July 2008.] They are heavily used in the engineering world in hardware design, software design, and process flow diagrams.

The block diagram is typically used for a higher level, less detailed description aimed more at understanding the overall concepts and less at understanding the details of implementation. Contrast this with the schematic diagram and layout diagram used in the electrical engineering world, where the schematic diagram shows the details of each electrical component and the layout diagram shows the details of physical construction.

Usage examples

As an example, a block diagram of a radio is not expected to show each and every wire and dial and switch, but the schematic diagram is. The schematic diagram of a radio does not show the width of each wire in the printed circuit board, but the layout diagram does.

To make an analogy to the map making world, a block diagram is similar to a highway map of an entire nation. The major cities (functions) are listed but the minor county roads and city streets are not. When troubleshooting, this high level map is useful in narrowing down and isolating where a problem or fault is. [Citation | author=American Radio Relay League (ARRL) | title =ARRL Handbook for Radio Communications | edition =Eighty-Third | publisher =Amateur Radio Relay League |isbn=0872599485]

Block diagrams rely on the principle of the black box where the contents are hidden from view either to avoid being distracted by the details or because the details are not known. We know what goes in, we know what goes out, but we can't see how the box does its work. [Citation | last =Nilsson | first =James W. | publication-date =October 1986 | date =1986 | title =Electric Circuits
edition =Second | publisher =Addison Wesley Publishing Company |isbn =0201126958
] Citation | last =Hayes | first =John P. |date=1988 | title =Computer Architecture and Organization | edition =Second | publisher =McGraw Hill Publishing Company |pages=89-92 | isbn =0070273669]

In electrical engineering, a design will often begin as a very high level block diagram, becoming more and more detailed block diagrams as the design progresses, finally ending in block diagrams detailed enough that each individual block can be easily implemented (at which point the block diagram is also a schematic diagram). This is known as top down design. Geometric shapes are often used in the diagram to aid interpretation and clarify meaning of the process or model. The geometric shapes are connected by lines to indicate association and direction/order of traversal. Each engineering discipline has their own meaning for each shape.

See also

* Black box
* Bond graph
* Functional flow block diagram
* Schematic diagram

References

External links

* [http://web2.concordia.ca/Quality/tools/3blockdiagram.pdf Concordia Block Diagram]


Wikimedia Foundation. 2010.

Нужен реферат?

Look at other dictionaries:

  • block diagram — ➔ diagram * * * block diagram UK US noun [C] GRAPHS & CHARTS ► a drawing that shows the relationship between different parts of a machine or system using rectangular or square shapes connected by straight lines: »The product concept is… …   Financial and business terms

  • block diagram — ☆ block diagram n. 1. Geol. a three dimensional perspective representation of geologic or topographic features showing a surface area and usually two vertical cross sections 2. a kind of flowchart using geometric figures and connecting lines, as… …   English World dictionary

  • block diagram — noun a diagram showing the interconnections between the components of system (especially an electronic system) (Freq. 1) • Hypernyms: ↑diagram * * * ˈblock diagram 7 [block diagram] noun a diagram that uses shapes, lines and arrows to show how… …   Useful english dictionary

  • block diagram — struktūrinė schema statusas T sritis automatika atitikmenys: angl. block diagram; block scheme; flow diagram; flowchart; structure diagram vok. Blockschaltbild, n; Blockschema, n; Strukturschema, n rus. структурная схема, f pranc. ordinogramme,… …   Automatikos terminų žodynas

  • block diagram — sandaros schema statusas T sritis fizika atitikmenys: angl. block diagram; block scheme; structural diagram vok. Schema Diagramm, n; Strukturschema, n rus. структурная схема, f pranc. diagramme structural, m; schéma bloc diagramme, m; schéma… …   Fizikos terminų žodynas

  • block diagram — funkcinė schema statusas T sritis Standartizacija ir metrologija apibrėžtis Grafinis valdymo sistemų ir vyksmų vaizdavimo būdas, naudojamas tų sistemų ir vyksmų bei jų atskirų elementų paskirčiai apibūdinti ir paaiškinti. atitikmenys: angl. block …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • block diagram — funkcinė schema statusas T sritis Standartizacija ir metrologija apibrėžtis Schema, aiškinanti atskirose funkcinėse matuoklio grandinėse arba matuoklyje vykstančius vyksmus ir naudojama nagrinėjant jo veikimo principą, taip pat jį derinant,… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • block diagram — funkcinė schema statusas T sritis Standartizacija ir metrologija apibrėžtis Schema, aiškinanti tam tikrus vyksmus, vykstančius atskirose funkcinėse grandinėse arba gaminyje; naudojama gaminio veikimo principams nagrinėti, taip pat jį derinant,… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • block diagram — funkcinė schema statusas T sritis Standartizacija ir metrologija apibrėžtis Schema, aiškinanti tam tikrus vyksmus, vykstančius grandinėje arba atskirose jos dalyse. atitikmenys: angl. block diagram; functional diagram vok. Funktionsübersicht, f;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • block diagram — sandaros schema statusas T sritis Standartizacija ir metrologija apibrėžtis Schema, nustatanti pagrindines funkcines gaminio dalis, jų paskirtį ir sąsajas. atitikmenys: angl. block diagram; block scheme vok. Übersichtsschaltplan, m;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”