Applying Visual Basic for Human Machine Interface Applications
Short summary:
Interfaces, database connectivity, and easy extensibility, Visual Basic. how off-the-shelf technologies based on specifications such as COM, ActiveX and OPC can be used with applications developed in Visual Basic...
Long summary:
This paper will explore the technical issues that must be addressed in providing information delivery from plant floor devices to the enterprise in human machine interface applications utilizing Visual Basic technologies. Issues to be addressed will include PLC and control system connectivity, database connectivity, recipe download, logging, trending, and alarming. The paper will explore how off-the-shelf technologies based on specifications such as COM, ActiveX and OPC can be used with applications developed in Visual Basic to address these issues and provide flexible, cost-effective information delivery systems. The audience for this paper is the control systems engineer with little or no experience with Visual Basic but who is familiar with PLCs, is comfortable using a PC running the Windows operating system, and may have created HMI applications in the past using other tools. INTRODUCTION The primary goal of a human-machine interface (HMI) is to assist the operator in running a machine and managing a process. A good HMI will increase the productivity of the operator and machine, increase uptime, and assist in providing consistent product quality. The required functionality of an HMI will vary based upon the type and complexity of product produced, the type of machinery used, the skills of the operator, and the degree of automation of the machinery. The types of functionality typically included are: Functionality Purpose Graphic Displays To provide information about machine operation and status to the operator in a format that allows for easy interpretation and determination of need for action User Input To facilitate inputs from the operator to adjust machine operation, perform machine setups, and respond to events Data Logging & Storage To provide for the storage of historical machine operating data for part traceability and analysis of ways to improve quality, productivity, and uptime. Also used to store and retrieve machine setup data where ©Copyright 1999, Instrument Society of America, All Rights Reserved Worldwide. The Software Toolbox is a registered trademark of SoftwareToolbox, Inc. needed. Trending To provide a means for visual analysis of data on current or past machine operation Alarming To provide notification to the operator of abnorma ...
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