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Report on designing and simulating a control system

Objective: To present a consultant report for designing and simulating a control system.

Define a practical engineering plant which would feature similar dynamical behaviour to the theoretical dynamics given in the plant description below.

A distributed control system is intended to be used for a large processing facility that involves as many as fifty to one hundred loops. Examples include a refinery, a brewery, a power plant, and the like.

One version of the communication linkages that is usually present in a distributed control system. Each manufacturer of distributed control systems has a different way of organizing them. A distributed control system is intended to be used for a large processing facility that involves as many as fifty to one hundred loops. Examples include a refinery, a brewery, a power plant, and the like. The modules of control equipment that communicate with each other are as follows.

Control processor (CP)
Applications processor (AP)
Workstation (WS)
Field bus module (FBM)

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The first three of these modules communicate with each other through a node bus or “data highway,” as it has been called. The field bus modules serve as devices that interface with transducers and valves in the process. The control processor contains the blocks described earlier (analog input, analog output, control, linearization, etc.) that are connected together by softwiring to provide the control algorithm required for each loop. Communication between the control processor and the process (a distance away) in the field takes place in the field bus module. l%vo types of field bus modules are available. One type provides a set of analog inputs and a set of analog outputs that send to and receive from the field continuous signals (4-20 ma). The other type of module sends to and receives from the field digital signals that often take the form of switch-contact closures~ The application processor is a microprocessor (or computer) in which the programs (or software) are stored for performing the many tasks described earlier and for managing the communication among modules. The workstation module is connected to a keyboard, a mouse, a monitor, and a printer for use by process operators to interact with the system. At the workstation, the process operator can call up on the screen various displays, change set points and controller parameters, switch from automatic to manual, acknowledge alarms, and perform other tasks needed to operate a control system consisting of many loops. A control system can also be configured as an offline task at the workstation. After configuration, the configured control system is downloaded to the control processor. If necessary, more than one workstation can be attached to the node bus in order to provide communication at several locations in a plant. If more than one workstation is used, only one of them should have the authority at a given time to be in charge of the control system.

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