DD276551A1 - DISTRIBUTED CONTROL SYSTEM WITH MODULAR FUNCTIONAL BLOCKS - Google Patents

Abstract

The invention relates to a distributed control system with modular function blocks, which interact as a plurality of computer modules and peripheral modules in a data processing system (DVS) with each other by means of communication elements. The invention has for its object to provide a simple distributed control system whose components are hardware-independent, modular assignable and interconnectable. According to the invention, the object is achieved in that the function blocks of a distributed control system are independent of one another, each having an initialization element and an interface element for the own computer component and for each other computer component of another basic system, which is to use the services of the function block, a nucleus and communication element in that the function blocks use the services of the real-time operating system kernel pertaining to the respective computer component and the nucleus elements of all the function blocks in the distributed system function as interpreters of messages of a transmission mechanism uniform in the system and are connected directly to the transmission mechanism. Fig. 2

Description

For this 1 page drawings

Field of application of the invention

The invention relates to oin distributed control system with modular function blocks, which interact as a variety of computer modules and peripheral modules in a Datinverarbaitungssystem (DVS) with each other by means of communication elements.

The invention is applicable in all fields of technology in which for process control, automation, rationalization u. a. Aim several Rochner in the vicinity are communicating with each other.

Characteristic of the known state of the art

Known distributed pruning systoms are widely used in the art. At Fleischmann. A concept for the representation and realization of distributed process automation systems ", Erlangen 1983, such systems are extensively analyzed, whereby solutions are described on the basis of several coupled computers, in which function blocks are distributed to the individual computers, which are an interface element for the Computer component in which the function module is located and each have an interface element (envelope element) for each other computer component in the distributed control system For the communication of the computer components with each other, the preparation of the message in the format of the transmission mechanism is required Using the services of the function module as an interpreter with the own computer component The effort for this solution is very substantial, since especially with a considerable number of modules, as with technical n control processes is very often the case, for each process control module, such a representative process and an Inerfaceelement (wrapping element) is required.

DE-OS 3112 693 describes a decentralized modular design system for a dnton processing system, in which independent, equal peripheral modules with a common asynchronous, bidirectional bus system are operated on a main memory. The operating system is divided among the individual computer modules and peripheral modules such that each computer can process independent user programs and programs by interpreting at least one program language.

Such solutions are associated with a considerable effort, since they do not allow local Vorteil. Likewise, koine different transmission media can be combined.

Ziol of the invention The aim of the invention is to be able to use microelectronic control systems variably and to expand them if necessary. Explanation of the essence of the invention The invention has for its object to provide a simple distributed control system whose components,

independent of hardware, modular assignable and interconnectable.

According to the invention, the object is achieved in that the functional components of a distributed control system

are independent of each other, each an initialization element and an interface element for its own computer component and (for any other computer component of another basic system that is to use the services of the function block, a

Have Nucleus- and Komunikationselement that the Funkiionsbausteine the services of the respective computer component

and the nucleus elements of all function blocks in the distributed system

Interpreter of messages of a system uniform transmission mechanism and work directly on the Transmission mechanism are connected. Then! it becomes possible to break down the entire distributed control system into

1. the respective basic systems with the computer component, the monitor module, the power-on diagnostic module and a real-time operating system,

2. The Tuningalsystem, which is generated for a certain degree of control in relation to the number of computer components used and the required main control functions, with the independent modular function blocks, each realize a main control function in the control system and

3. the user system, which is adapted to the special requirements of user technology and includes technology-specific modules.

Basic system and functional system can be made uniform throughout machine groups, while the Application system is developed for each specific application technology-specific. The elements essential to the invention are realized within the functional system. The described Funkiionsbauslcine can in the realization, for. B. Parameter Modules, On / Off Modules, Power and Coupling Modules, Be process control modules, Zoitsteuotmodule or controller modules. The intorfacoelement for the own computer component and the interface element for the other computer components

has the same structure and converts the messages into the syntax of the overall system

Transfer mechapism for direct transfer to the nucleus moment of the function block or for direct transfer

to the transmission mechanism, which in turn sends the message directly to the nucleus element of the

Transfer function module of the other computer component. C er advantage of the invention consists in the fact that the function blocks arbitrarily on the computer component of

different base systems can be divided, added or disarmed by them and that so that the controller with little effort εη the various tasks can be adjusted. The control systems can also be upgraded and retrofitted without having to modify the basic and functional systems. The function modules can be moved to other computer components.

The often complex user system is independent of the expansion stage and the number of computer components in the Control system, as the interface elements for the function blocks of their own and other computer components

are the same.

The user system for each individual computer component is thus simultaneously assigned to all function modules ** of the distributed system Control system connected. Compared to the state of the art thus complex proxy processes for Connection of the function blocks to the transmission mechanism of the control system saved. performance example The invention will be explained in more detail with reference to an exemplary embodiment.

A vacuum system has »in a standard control system with distributed computers, which has several basic systems with a large number of function blocks as a functional system. The user system is based on the respective technology, eg. As evaporation or plasma-assisted coating designed.

Fig. 1: shows the structure of the standard Stftuerungssystems in a simplified form. Fig. 2: shows the structure of the standard control system with user-specific extensions. The Siandard control system of FIG. 1 has three basic systems, an operating computer 1, a control computer 2 and a An output computer 3. Each of these systems has a base Echtzeitbetriebssystemxern ¹ O, a monitor 11 and a Start-up diagnostics 12. The Dos functional system consists of nine function blocks in the standard control system, which are based on the basic systems as follows

are divided. The operating computer 1, the function blocks 20-Bedionbaustein, 21 -Biidbaustein, 22-

Error processing module and 23 - History module assigned. Control unit 2 includes the radio modules 24-process control block, 25-parameterization block, 2β-time control block

and 27 - controller block assigned.

Dom input-output computer 3 is assigned only to the process input / output module 28. Each of these Funktionsbaustoino 20 to 28 has uniformly according to the invention an initialization element 30 and a Intcrfaceelemont 31 for the own computer component an interface element 32 for the other computer comonents and a Nucleus and communication torque 33 on. Also associated with each function block 20-28 is a corrector

in the system uniform transmission mechanism 34. The physical coupling de.- basic systems 1 to 3 takes place in this case over oils computer coupling modules for a bus-oriented coupling. Although this standard control system is fundamentally functional, it is practically unusable because any user function blocks are still missing.

FIG. 2 is the standard control system of FIG. 1 with a greatly simplified user system. It was a Meßgeräterechner 4 with only one measuring module 40 and a gas control computer 5 with the function blocks 41,42 and 43 for three different gases additionally arranged as basic systems and the operating computer 1 and the control computer 2 technologypezitische software modules 50 affiliated. The software modules 50 can realize the images for the image module 21 in the operating computer 1 and realize the technological process at the control computer 2. Below, the system will be described in function.

With the operating computer 1 and the control computer 2 is ever the equivalent process can be started. Since «Start ι is a request to the Prozeßbauitein 24, which sits on the Batistystem control computer 2. The user syatom with the software component 50 calls the interface element 31 of the process control module 24 as follows

- create process (process number).

Data interface element 31 converts the request into a message according to the syntax of transmission mechanism 34 and hand over! directly to the nucleus and communication element 33 of the same process block 24, which triggers the corresponding activities.

In the other case, the software module 50, which is arranged on the operating computer 1, also calls the interface element 31 of the process module 24 installed in the operating computer 2

- create proc (prczessnummor) on.

This similarly converts the request into the syntax of the transfer mechanism 34 and passes the message to it. By means of an addressing mechanism installed in the transmission mechanism 34, this message enters the correct function module (20-28 and 40-43), where it is transferred directly to the nucleus and co-communication element 33 of the process module 24 for execution.

It can be seen from this representation that the call of the process module 25 is identical in both cases and thus independent of the arrangement of the function block, in this case process block 25.

By the direct connection of the function blocks to the transmission mechanism, the otherwise usual Stollvertreterprozeß on the control computer 2. The transmission mechanism 34 takes physically different transmission media through corresponding Koppolmodule (layer 1 to ISO reference model) to complete, whereby common Rechnerbussyeteme 35 or serial transmission systems 36 can be coupled , The distribution of the Stouorungssystems can thus be done in contrast to known solutions with different transmission systems 35 without changing the building blocks of the basic and functional systems.

Claims (2)

1. Distributed control system with modular function blocks, characterized in that the modular function blocks are independent of each other, jeunlisiisiörungselementfür the own computer component, an interface element for the own computer component and for any other computer component in the distributed system that wants to use the services of the function block, a Nucleus and a communication element, that the function blocks use the services of belonging to the respective computer component real-time operating system kernel and the nucleus elements of all function blocks in the distributed system as an interpreter of messages of a uniform system in the transmission mechanism and are connected directly to the transmission mechanisms. 2. Distributed control system with modular function blocks according to claim 1, characterized in that the interface elements for the own computer component and the interface elements for the other computer component have the same structures that the connection of a function block to other functional components of their own computer component is realized by interface elements that the Convert requests into the syntax of the messages of the system mechanism which is uniform in the system and transfer them directly to the nucleus element of the function block and that the connection of the function block to other function blocks of other computer components, by the interface elements in the same way in the Convert syntax of the transmission mechanism and pass it directly to the transmission mechanism, which passes these requirements directly to the nucleus element on the computer component.