1、英文原文Development of a monitoring and control platform for PLC-based applicationsAbstractThis paper discusses the design and implementation of a platform to remotely monitor and control PLC-based processes over TCP/IP or by using the GSM network. The platform is built using industry-standard off-the-s
2、helf PLCS. Integrated with each PLC are communication processors that can be used for connectivity to the network and to a GSM modem. The communication processor module (Ethernet module) used in this work, provides an industrial compatible protocol over TCP/IP that achieves the same functionality as
3、 Profinet but at a much higher bandwidth (10/100 Mbps).Additionally, a mobile-based communication protocol that facilitates remote monitoring and control of PLCs using SMS messages has also been developed. The intent here is to provide system users with a back-up communication mechanism in case of a
4、 network failure. 2007 Elsevier B.V. All rights reserved.Keywords: PLC; TCP/IP; GSM; Remote monitoring1. IntroductionThe recent growth of networks technology and specially the wide spread of the Internet have promoted the development of distributed measurement systems for a variety of industrial app
5、lications. These distributed measurement systems can be usedin the monitoring and control of various instruments in the network 1,2.A Programmable Logic Controller (PLC) is microprocessorbasedcontrol system that can be programmed to sense, activateand control industrial equipment and therefore incor
6、porates anumber of input/output terminals for interfacing to an industrialprocess. A control program stored in the PLC memory determinesthe relationship between the inputs and outputs of the PLC. PLCs are intelligent automation stations that possesshighly useful and desirable features such as 3: Rob
7、ustness. High degree of scalability: modern PLC families have a widespectrum of CPU types that allows easy scalability in functionalityand performance. Extensibility: the modular design of PLCs enables the extension with a wide range of digital and analog I/O modules. Also, various integrated techno
8、logy modules are available for various application areas. Sophisticated communication capabilities: modern PLC shave communication ports that provide for centralized or distributed connectivity. Powerful development environment: modern PLC families come with a cross development environment that supp
9、ort different languages for programmability, allows semigraphicalhardware configuration and offer strong debuggingmechanisms.Remote access to control and monitor various devices in an industrial setting is of value to engineers and automation facilities.Current implementations of remote PLC monitor
10、and control usededicated PCs or web servers connected to the PLC. Fig. 1illustrates a common architecture used in industry. As shown, PLCS are connected to the network through a computer. The PLCSystem is usually interfaced to this computer using the serial Portor Profibus. These types of systems ar
11、e disadvantaged by the dedicated use of a PC to access the PLC system. The architecturealso does not make use of the advents and strides made in areassuch as telecommunications and web technology.Available online at Computer Standards & Interfaces 30 (2008) 157166 Corresponding author. E-mail addres
12、s: asagahyroonaus.edu (A. Sagahyroon).0920-5489/$ - see front matter 2007 Elsevier B.V. All rights reserved.doi:10.1016/j.csi.2007.08.008In recent years and due to the ever increasing capabilities of PC computing and the influx of network protocols and standards, there has been a surge in the design
13、 and implementation of distributed measurement and control systems for industrial applications. Typically, these systems are based on the client server architecture while securing communication using the TCP/IP protocol 46. Modern PLCs come with embedded web servers that provide open access to usefu
14、l real time information and diagnostics that can be viewed via any standard web browser.This remote accessibility provides several advantages over more traditional solutions. For example, a problem can easily be diagnosed and perhaps fixed remotely; also engineers can have remote access to the PLC C
15、PU configuration tools and hence allowing for remote upload/download and configurability via the intranet or internet. In this paper we will discuss the design and implementation of a networked platform for remote monitoring and control of PLCs.The platformis built around the Siemens S7 series of PL
16、Cs. These PLCs have an integrated communication processor that can be used to provide accessibility to the internet. The monitoring and control can be accomplished in a wired or wireless environment, via an intranet or internet hence providing for a complete solution for the remote monitoring and control of industrial processes. We will also discuss the utilization of the GSM network and
