A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
PLC内部固化了系统程序，只需要用与之对应的编程语言就可以，简单易学。 3、PLC是以单片机为主组成的通用控制器，所以价格比单片机贵。 仪表，家电等功能固定，量大的产品适合用单片机，而那些功能差别大的 工业控制 适合用PLC。
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、影视 ...
PLC并不难学。 PLC编程语言符合IEC 61131标准。其中比较主流的语言是模块化的编程语言，也即IEC 61131 3语言。由于所有的PLC生产厂家都必须遵循IEC 61131标准，因此深入学习某一款PLC后，其它的PLC大体上是类似的。 学校PLC课本上讲解时一般都用T形图。这是很落后的一种编程方式。走上工作岗位后，务必 ...
（2）程序简单易学，系统的设计调试周期短 PLC是面向用户的设备，PLC的生产厂家充分考虑到现场技术人员的技能和习惯，可采用梯形图或面向工业控制的简单指令形式。 梯形图与继电器原理图很相似，直观、易懂、易掌握，不需要学习专门的计算机知识和语言。
PLC学习的门槛并不高，当然这个针对的是两年之后进行一般自动化设备的调试工作而言。 从传统的汽车制造、化工、冶金，到新兴的锂电池、光伏、机器人、物流仓储、自动化设备等，几乎所有涉及自动控制的工厂都需要PLC工程师。想学PLC建议找一份做自动化设备的公司从接线开始，熟悉基本的 ...
对于PLC的名字，其实做工业控制或者流程控制的朋友们肯定不陌生。而且PLC的控制功能，其实正是PLC的主要特点，即替代现场操作工人，充当“机器大脑”完成工业控制环境下复杂的业务协调和管控。加上了系统二字，其实理解起来应该是： 以PLC控制器为核心和控制单元，实现一整套、一系列完整 ...
哪个好学? 相信绝大部分初学者，最关心的问题，单片机和PLC哪个好学？ 单片机是微型计算机系统，属于微控制器的其中一种，PLC的全称是可编程逻辑控制器，从名字上来看这二者肯定相通之处，但是又有本质区别。 对于单片机好学还是PLC好学的问题，总的来看，PLC因为入门简单，所以更适合新手 ...
在博图（TIA Portal）仿真中，HMI按钮按下后报错“变量无法写入PLC”但编译无报错，通常是通信配置、变量映射或仿真设置的问题。以下是分步排查方法和解决方案： 一、核心原因分析 编译无报错仅说明程序语法正确，但“写入失败”属于运行时逻辑或配置错误，核心可能： • HMI与PLC的通信连接未 ...
我们用这台PLC作为通信管理机，同时又用作逻辑控制，结果这台PLC因为内存分配的原因，发生系统重启，造成地铁站失电近2分钟，站内一片漆黑，好在没出事。 事后，我们查了PLC的深层核心参数，发现这款PLC是生产厂家的升级产品，又是一个不可靠的产品。
可编程逻辑控制器（PLC）是基于计算机的固态设备，用于控制工业设备和工艺。而PLC是整个SCADA和DCS系统中使用的控制系统组件，它通常是较小的控制系统配置中的主要组件，用于提供监管控制汽车装配线和发电厂吹灰器控制等离散工艺，PLC广泛应用于几乎所有的工业过程。PLC具有用户可编程存储器 ...
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