共查询到20条相似文献,搜索用时 93 毫秒
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郑可荣 《制冷空调与电力机械》1997,(2)
简单介绍了在电力部机机所设计的起重机上采用华光公司PLC的性能和规格.并分析在起重机上应用PLC的优越性。PLC是属于工业级PC机,能够满足起重机使用环境和工况的要求。具有高性能的的PLC作为控制核心,可以从多方面提高起重机的可靠性,从而使起重机整机性能提高。文中还简单介绍了PLC的发展潜力。 相似文献
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刘娜 《中国新技术新产品》2012,(16):171
本文论述了锚链编环机PLC控制系统的设计与应用。主要介绍了锚链编环机的生产工艺,控制方式及PLC型号及功能模块的确定,PLC控制回路的设计以及PLC梯形图程序的设计。 相似文献
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该文针对目前精冲机的电气控制系统操作复杂、系统抗干扰能力差、电气控制系统和液压系统难以协调工作的现状,给出以PLC为核心控制器件的控制方案,详细阐述控制系统的设计过程,PLC、触摸屏的硬件选择及应用注意事项。实际应用表明:利用PLC实现对精冲机的控制,保证了精冲机各种动作协调、可靠地运行,从而提高精冲机的整体性能。 相似文献
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文章介绍了西门子PLC与流量传感器在中国铝业中州分公司氧化铝厂拉链机润滑系统精确计量控制上的应用,介绍了智能集中润滑系统通过精确计量来达到准确控制拉链机集中润滑的原理、设备性能和特点。 相似文献
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本文阐述了基于2级网络结构的PLC控制设备维护系统的应用实例。该系统通过PLC集成与上位机组建的工业以太网实现硬件系统间的通讯功能,做到实时的设备维修管理。 相似文献
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自20世纪80年代中期以来,伴随着自动控制、计算机、网络、通信等技术的发展,可编程控制器(PLC)己发展成为一种可提供逻辑控制功能、过程控制功能、运动控制功能、数据处理功能、联网通信功能的多功能控制器。但由于其自身的局限性,在数据计算处理和人机交互性等方面已不能满足用户更高的控制要求。因此可以将PLC和上位计算机结合,以计算机的强大优势完成对PLC系统的监控。本文简单的对PLC与上位机各种通信方式优越性进行了分析。 相似文献
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Petri nets have been extensively applied for specification, design, verification, performance evaluation, and simulation of discrete event control systems (DECS). The usual way to verify the dynamic behaviour of DECS design is to employ a process-based model, which proves to be impractical in application because the process-based model does not usually fully correspond to the control programming behaviour. This paper proposes a sensor-based stage Petri net (SBSPN) to represent a programmable logic controller (PLC) stage logic diagram (LD) for discrete-event control design. The new technique is able to simplify the modelling process of the complex PLC program without considering the interlocking problem within the ladder diagram. An illustrated example is used to explore the new methodology. The proposed method contains the power and flexibility of the Petri net analysis prior to the PLC implementation. It is believed that this technique is significant for industry practice. 相似文献
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ZHUShao-ying XUYu HEZheng-wen 《国际设备工程与管理》2003,8(3):149-153
The principle and working process of Vacuum Resin Shot Dosing Equipment (VRSDE) are analyzed and the characteristics of IP1612-220PLC ( Programmable Logical Controller) are intro-duced briefly at first. Then the authors discuss the flow of program, the assignment of PLC I/O poru,the wiring diagram, and the ladder logic program of the PEG control system of VRSDE in detail.Some application issues of the system are accounted for in addition. Finally, according to the information acquired from users, the authors draw the conclusion: this system owns a high reliability and availability and greatly improves the automatic degree of VRDE. 相似文献
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PN PLC: A methodology for designing,simulating and coding PLC based control systems using Petri nets
Flexible manufacturing cells (FMCs) are well established as a means of improving manufacturing efficiency in many batch production industries. They consist of an integrated group of computer numerically controlled (CNC) machine tools, programmable logic controller (PLC) based work/tool handling equipment and a control system to synchronize their operation. The safe and reliable operation of FMCs is clearly essential for their efficient use. However, FMCs are complex systems with elements that operate concurrently and interact at irregular times, depending upon the components to be produced. This inherent complexity demands intricate and sophisticated control systems which require development methodologies that are both comprehensive and rigorous. In this paper the authors introduce a methodology (PN PLC) which uses Petri nets for producing correct programmable logic controller (PLC) programs directly from the specifications. The methodology is specifically contrasted with the benefits, and problems, encountered in using tools such as 'ladder diagrams' (LDs) and 'sequential function charts' (SFCs) for designing logical control systems. PN PLC has advantages over ladder logic in clarity, which allows the program to be checked, maintained and updated reliably. Furthermore, the Petri net graph is a one-to-one equivalent of a ladder logic diagram, and thus either representation may be algorithmically translated to the other without loss of information. Finally, the rules for creating Petri net graphs, and subsequently translating them, are both simple and robust in use. 相似文献
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介绍一种基于S7200的PLC和变频器及TD200组成的恒压供热系统,应用了模糊控制技术.较好的克服了传统PID控制中稳定性差、参数调整困难的问题。它包括加热控制和恒压供水两大子系统。详细分析了系统设计方案,阐述了系统组成和工作原理,给出了详细的流程图,并给出了在PLC上实现模糊控制的方法及相应的参数设置及调整。结果表明取得了较好的效益,提高了供水质量,有一定的节能效果。 相似文献
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为实现高精度SJJF型数显手动分度头的数控化改造应用,满足某航空发动机整机性能测试中车台用角位移传感器自动校准检测的实用性需求,解决手工角度分度耗时费力的难题,提出了角度量自动分度控制系统设计方案,运用逻辑可编程器件(Programmable Logic Controller,PLC)配合专用梯形图编程指令,实现角度光栅信号自动数字化采集、角度值换算、比例微分积分闭环控制(Proportion Integration Differentiation Controller,PID)定位及光栅对零,能够有效满足车台用角位移传感器线性度、灵敏度等校准精度要求,且节约了70%的时间,提高角度分度效率的同时也降低了劳动强度。 相似文献