Since all supervising and control of the processes originates from a central control room, the functions for start up, supervising and regulation will often be more and more complex.
The structure and planning of control systems
require a broad technique knowledge.
It is therefore important to start to establish
a working team with knowledge of process-, electro-, automation-, regulation-,
instrument- and computer skills.
Since all supervising and control of the processes originates from
a central control room, the functions for start up, supervising and regulation
will often be more and more complex.
The functions will be composed of different techniques according to the diagram.
Process knowledge is fundamental for building up functions for the control system.
The security functions for person, process, machinery, and environment are of critical importance.
Because the start-up functions which influence rotating machines and other objects of different sizes separately or in a group, security questions must be concidered.
The security of electrical systems is protected by laws and regulations which cannot be ignored when the functions are complex and include electro technique and different types of electronics as well as computer hardware and software systems.
Structure
Process knowledge is the basis for structuring, planning and projecting.
Depending on the process, the control system will be structured to meet accuracy and availability requirements as well as person- and machinery security in the supervision and control of the product.
The control system will be structured and include the following:
ProjectionAutomatic group start-up by an operator. Automatic functions for regulating with supervision. Analysis and adjustment by an operator. Graphical process diagrams with supervision and controlled object in it. On-screen report functions. Printer and alarm supervision.
It is important to start with preparatory projections work.
These projections should be executed so that a simulation of the entire
system can be carried out before the implementation of the actual system.
Making projections enables effect economies and ensures an effective
installation.
As a tool in projection the following course of events have to be done:
1. Process-and function descriptions as describes the controlled process with process flow.
2. Control system descriptions 1 as from process technical view describes what shall be controlled and supervised and in princip how. Make clear necessarily demands of accuracy and security risks.
3. Control system description 2 as from specialist view describes measure-, control-, regulating-, and supervised functions. Lists in / out path. Make clear maschine functions and possible communication with other systems. Dimensioning the system.
4. Structure the system. Inquiry on specifikations will be required.
5. Purchasing with demand specifications and the parallel laying out constructions for electrical-, instrument-, mechanikcal-, and process adaptation.
6. Control systems description 2 works up in detail during consideration of security demand and parallel herewith the adjustment of functions in detector, adjustible equipment, interfase, accuracy and tolerance demand.
7. The specialists give the functions technical solutions during considerations of security demand and parallel herewith functions diagram, engine- and equipment lists, instrument lists and also remaining drawings.
8. Programming during consideration of security demand and parallel herewith compilation of document and distribution.
9. Program simulation and test in parallel here with the field montage.
10. Installation of the system and test of I / O- signals.
11. Function tests in the system.
12. Start up.
13. Document completion.