Practical Automation Specification

Abstract

This chapter specifies equipment-based control system structures for complex and integrated systems and describes the approach to and implementation of an equipment-based control strategy. Based on a view of subsystems in a production, process or a single machine the control system has to abstract the subunits in an object-oriented manner to obtain their methods and properties. The base subunits will run as separate state machines (either on centralized or decentralized control devices) representing themselves to the next control hierarchy level only by said methods and properties. These base subunits form functional subsystems in the same way.

Advantages of such a modular specification are: easy replacement of different base units with the same functionality to the next hierarchy level, high efficiency in construction kit engineering of systems, easy integration of systems to vertical integration attempts – especially in the field of networking and data concentration. The challenge is the implementation on standard industrial programmable logic controller (PLC) systems with a standard industrial-like programming language (e.g., EN 61131). An example demonstrates the implementation in a modern test stand for heat meters for the German Physikalisch-Technische Bundesanstalt (PTB) institute, a system with about 1000 physical input/output (I/O) and measurement points.

Abbreviations

μC

micro controller

DA

data acquisition

ERP

enterprise resource planning

GBIP

general purpose interface bus

I/O

input/output

IEC

International Electrotechnical Commission

IO

inputoutput

IT

information technology

MES

manufacturing execution system

ODBC

object database connectivity

OLE

object linking and embedding

OO

object-oriented

OOP

object-oriented programming

OPC

online process control

PC

personal computer

PCI

Peripheral Component Interconnect

PLC

programmable logic controller

PTB

German Physikalisch-Technische Bundesanstalt

PXI

PCI extensions for instrumentation

SCADA

supervisory control and data acquisition

SQL

structured query language

UML

universal modeling language

XML

extensible mark-up language

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Process Design and Automation, ForschungszentrumProfactor Research and Solutions GmbHSeibersdorfAustria

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