Lenze Controller-based Automation - Manual (Page 60)

8 Glossary
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Lenze · Controller-based Automation - Visualisation · System Manual · DMS 1.5 EN · 04/2014 · TD17
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O
Object-oriented programming
(OOP)
Object-oriented programming (OOP) is a procedure for structuring computer
programs where data belonging together and the corresponding program
logic are combined to objects (separate units).
Conceptually, a program then no longer (as with procedural programming)
sequentially processes individual functional areas of an algorithm which
changes a certain number of data, but the program logic is developed in the
communication and the internal status changes of the objects of which the
program is composed.
Advantages of object-oriented programming:
- Modularisation of codes
- Easier maintainability and reusability of individual modules
Higher flexibility of the entire program, in particular, in the field of user
guidance because programs of this kind are less obliged to force certain
operating sequences upon the user.
OLE Abbreviation for "Object Linking and Embedding": Insertion of functional
objects into other applications, e.g. a Microsoft® Excel table into a Microsoft®
Word document.
OPC Abbreviation for "OLE for Process Control": Defines an interface based on the
Microsoft® Windows® technologies OLE, COM and DCOM which enables data
exchange between different automation devices and PC programs without
driver and interface problems.
The OPC server provides the data and the OPC client receives the data.
OPC tunnel OPC server and OPC client can be on different PCs networked via Ethernet.
Communication between the PCs requires a special DCOM configuration. For
OPC communication from several computers, Lenze uses an OPC tunnel that
does not require any configuration.
P
PLC Designer Lenze Engineering tool for programming the PLC according to IEC 61131.
Power tag In the »VisiWinNET®« visualisation, a "Power tag" describes the variables
available.
A "Power tag" can represent different variable types. It is possible to combine
up to 32 bit variables in a long word in the PLC and to transfer them as one
variable.
Within »VisiWinNET®«, the user can then use the long word for BIT operations
such as in a checkbox or for activation of alarm messages.
With 2000 power tags, thus theoretically a maximum of 64kBit variables are
available to the user.
The number of power tags limits the number of internal »VisiWinNET®«
variables in the same way as the variables communicated via the bus (external
variables).
PLC Abbreviation for "Programmable Logic Controller".
Property Parameter of a control/control element, e.g. colour or size