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PLC 与工控机的串口通信设计

摘要

随着计算机技术，自动控制技术及网络技术的迅速发展，在工业领域中对控制

系统的要求逐渐增高。在众多的工业控制系统中，分布式控制系统应用最为广泛。

在分布式控制系统中，PLC 作为现场控制设备，被用于数据采集与控制。而 PLC

又由工业控制计算机进行编程从而实现两者的数据交换。PLC 与工控机的结合，提

供了一种可靠、经济和开发周期短的分布式控制系统构建方案。本文主要以 PLC 作

为硬件基础，结合工控机编程软件实现两者间的串口通信。

串口通信的实现是工业控制系统的关键，它作为一种灵活、方便、可靠的数据

传输方式，在工业现场得到了越来越多的应用。本文中使用的是三菱 PLC 与工控机

进行通信。通过了解 PLC 的基本结构、工作原理、功能及特点、内部运作方式和扫

描周期，以及三菱 PLC 的工作模式与网络通信结构，确定 PLC 与工控机的连接通过

标准 RS-232 通信电缆实现。

PLC 与工控机利用标准 RS-232 通信电缆连接后，首先要设置上下位机的通信格

式，具体为数据长度、奇偶校验、停止位、波特率、标题、终结符、控制线、和校

验、协议等内容的设置；继而还要设置通信控制协议格式。最后由工控机软件进行

编程，编程软件由 VC++6.0 实现，在软件平台内采用通信空间 MSComm 空间进行工

控机与 PLC 的通信。将 PLC 与工控机连接后进行了通信验证，可以证明该程序可以

实现 PLC 与工控机的串口通信。

关键词：PLC、工控机、串口通信、VC++6.0

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Abstract

With the rapid development of the computer technology, the automatic

control technology and the network communication, the demand presented by the

industry and mining enterprise to the control system is higher and higher. In the

multitudinous industrial control system, the distributed control system’s application is

most widespread. In the distributed control system, they usually select PLC

as the control device, using in the data acquisition and control. By the industrial control

computer, PLC can be programmed to realize the data exchange. The combination of

PLC and industrial controlling provides a reliable, economic and short development

cycle to build distributed control system. Based on the hardware of the PLC ,the pape

combined with software to realize the serial communication between industrial control

programming.

The implementation of serial communication is the key to the industrial control

system, as a flexible, convenient and reliable way of data transmission, is becoming more

and more popular in the industrial field of application. The paper use a mitsubishi PLC

and industrial computer to realize the communicate. Through understanding the basic

structure, working principle, functions and characteristics, internal operation and scan

cycle of PLC. And the operation mode of the Mitsubishi PLC and network

communication structure, determine the PLC and industrial PC connected via a standard

RS - 232 communication cables.

PLC and industrial PC using a standard RS-232 communication cable connection,

the first to set up the upper and lower position machine communication format, specific

to the data length, baud rate, parity, stop bits, and title, terminator, the line of control, and

calibration, agreement, etc. Set of content; then set the communication control protocol

format. Finally conducted by the industrial computer software programming, the

programming software by VC++ 6.0 to realize, in the software platform USES the

communication space MSComm space carries on the industrial PC and PLC

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