Planning of Control Systems

The relevant control and regulation tasks must be performed also in explosive industrial processes. However, special circumstances and requirements related to the potential occurrence of the explosive medium must be taken into consideration. The system must be designed so that explosion can be avoided in any situation (normal operation or breakdown).

Sensors used for the measurement of physical values (pressure, temperature etc.), control elements (valves, pumps etc.) must be designed in a different way in explosive atmospheres.

Some of the following system elements are available in today’s modern process control and automation systems:

+ PLC
+ HMI
+ SCADA
+ DCS

The above control and regulation components are connected to the technological equipment via so-called field instruments and field detection systems. Connection between the field devices and the controller(s) is often established by some industrial communication network, using a wireless data transfer procedure in many cases.

Today, more than one programmable and configurable system units must operate even in the smallest automation systems. Therefore the relating control technical plan documentation must contain the details of the cooperating programme systems:

+ I/O lists
+ Screenshots of  User Interface
+ Function descreptions
+ Block schemes
+ Description of communication data fields

Today, communication systems and networks are widely used in state-of-the-art controls and regulations, with an increasing share of those using parts based on wireless data transfer procedures. The same holds for the controls and regulating circuits of explosive process parts. However, the principle of a design eliminating the possibility of explosion under all circumstances is valid also for the communication devices in such process parts.

Based on the above, it is clear that the designs of regulating and control systems and communication networks operating in explosive atmospheres significantly differ from the designs of systems operating under normal circumstances. In addition, the special design requirements (may) have significant effects also on system components installed outside the atmosphere.

Based on the above, our planning and expertising activities related to industrial process control systems fully cover the necessary planning phases:

+ Planning of process instrumentation
+ P&ID
+ Planning of equipment
+ Wiring plans
+ Layout and routing plans
+ Planning of communication connections
+ Software system plans
+ HMI planning
+ Box plans
+ Drawing of designer expenditure
+ Telecommunication plans