IEC61131-3标准与PLC编程语言简介

需积分: 10 180 浏览量更新于2024-09-09 收藏 63KB PDF 举报

"介绍PLC及其标准化编程资源IEC61131-3" PLC（可编程逻辑控制器）是工业自动化领域中广泛使用的设备，用于控制各种机械设备和生产过程。PLCopen是一个专注于提高自动化效率的组织，它推动了IEC61131-3标准的制定，这是第一个旨在标准化工业自动化编程语言的国际努力。这个标准不受任何单一公司的约束，得到了全球范围内的支持。 IEC61131-3标准由多个部分组成，包括： 1. 第一部分：总体概述，提供对整个标准的概括性理解。 2. 第二部分：硬件，定义了PLC硬件的要求和接口。 3. 第三部分：编程语言，规定了几种统一的编程语言，允许跨平台的互操作性。 4. 第四部分：用户指南，为用户提供使用标准的指导。 5. 第五部分：通信，定义了PLC之间的通信协议和接口。 6. 第七部分：模糊逻辑，涉及在PLC中应用模糊逻辑的方法。 7. 第八部分：应用指南，提供了实际应用中的具体指导。第三部分是标准的核心，它详细阐述了约200页的内容，包含60多张表格，如功能表，定义了一套统一的编程语言的语法和语义，以及整体的软件模型和结构化语言。这些语言包括梯形图（Ladder Diagram）、指令表（Instruction List）、功能块图（Function Block Diagram）、连续函数图表（Continuous Function Chart）和结构文本（Structured Text）等。此外，该标准可以被划分为两个主要部分： 1. 共同元素：这部分涵盖了所有编程语言共有的基础，如数据类型、变量和程序结构。 2. 编程语言：具体定义了每种语言的特性，使得开发者可以根据项目需求选择最合适的编程语言。通过IEC61131-3标准，PLC的编程变得更加标准化和模块化，这降低了开发成本，提高了代码的可读性和可维护性。同时，它促进了不同厂商设备间的互操作性，使得系统集成更为简便。对于工程师来说，理解和掌握IEC61131-3标准是提升PLC开发能力的关键步骤。

PLCopen

for efficiency in automation

IEC 61131-3: a standard programming resource

IEC 61131-3 is the first real endeavor to standardize

programming languages for industrial automation. With its

worldwide support, it is independent of any single

company.

IEC 61131-3 is the third part of the IEC 61131 family.

This consists of:

• Part 1: General Overview

• Part 2 Hardware

• Part 3 Programming Languages

• Part 4 User Guidelines

• Part 5 Communication

• Part 7 Fuzzy Logic

• Part 8 Application Guidelines

There are many ways to look at part 3 of this standard. Just

to name a few:

• the result of the Task Force 3, Programming

Languages, within IEC TC65 SC65B

• the result of hard work by 7 international companies

adding tens of years of experience in the field of

industrial automation

• approx. 200 pages of text, with 60-something tables,

including features tables

• the specification of the syntax and semantics of a

unified suite of programming languages, including the

overall software model and a structuring language.

Another elegant view is by splitting the standard in two

parts (see figure 1):

1. Common Elements

2. Programming Languages

Let’s look more in detail to these parts:

Common Elements

Data Typing

Within the common elements, the data types are defined.

Data typing prevents errors in an early stage. It is used to

define the type of any parameter used. This avoids for

instance dividing a Date by an Integer.

Common datatypes are Boolean, Integer, Real and Byte

and Word, but also Date, Time_of_Day and String. Based

on these, one can define own personal data types, known

as derived data types. In this way one can define an analog

input channel as data type, and re-use this over an over

again.

Variables

Variables are only assigned to explicit hardware addresses

(e.g. input and outputs) in configurations, resources or

programs. In this way a high level of hardware

independency is created, supporting the reusability of the

software.

The scopes of the variables are normally limited to the

organization unit in which they are declared, e.g. local.

This means that their names can be reused in other parts

without any conflict, eliminating another source of errors,

e.g. the scratchpad. If the variables should have global

scope, they have to be declared as such (VAR_GLOBAL).

Parameters can be assigned an initial value at start up and

cold restart, in order to have the right setting.

Configuration, Resources and Tasks

To understand these better, let us look at the software

model, as defined in the standard (see below).

Access path

Execution

control path

Task

Program Program

FB FB

Task

Program

Task

Program

FB FB

Task

Resource Resource

Configuration

Function

Block

The IEC 61131-3 Standard

Common Elements

Programming Languages

At the highest level, the entire software required to solve a

particular control problem can be formulated as a

Configuration. A configuration is specific to a particular

type of control system, including the arrangement of the

hardware, i.c. processing resources, memory addresses for

I/O channels and system capabilities.

Within a configuration one can define one or more

Resources. One can look at a resource as a processing

facility that is able to execute IEC programs.

Within a resource, one or more Tasks can be defined.

Tasks control the execution of a set of programs and/or

function blocks. These can either be executed periodically

or upon the occurrence of a specified trigger, such as the

change of a variable.

Programs are built from a number of different software

elements written in any of the IEC defined languages.

Typically, a program consists of a network of Functions

and Function Blocks, which are able to exchange data.

Function and Function Blocks are the basic building

blocks, containing a datastructure and an algorithm.

Let’s compare this to a conventional PLC: this contains

one resource, running one task, controlling one program,

running in a closed loop. IEC 61131-3 adds much to this,

下载后可阅读完整内容，剩余3页未读，立即下载

李瑞特

粉丝: 0
资源: 2

IEC61131-3标准与PLC编程语言简介

PLC-BackupToolV6.0.rar_PLC BACKUP TOOLV6_PLC Backup_PLC BackupTo

PLC心跳 在线离线显示_判定labview与PLC的连接是否断开_plc心跳超时_心跳信号plc_plc心跳信号_plchea

OpenPLC_v3-master_PLC_openplc_OpenPLC_v3runtime_源码.zip

java与plc通信.rar_java与plc通信_java plc_java plc 通信_java与plc_plc与java

plc io模拟plc

private Plc? plc;

国产plc兼容三菱plc编程

欧姆龙plc与plc通讯

触摸屏上连接了PLC A和PLC B，想将PLC A的某个位信号传送给PLC B的某个位地址

三菱fxplc 串口助手和plc 通信

最新资源

PLC心跳在线离线显示_判定labview与PLC的连接是否断开_plc心跳超时_心跳信号plc_plc心跳信号_plchea