Siemens pa module p03-01 manual The Purpose of Curves, Industry Sector, IA&DT

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Industry Sector, IA&DT

The Purpose of Curves

Curves are displayed to show courses. By selecting different time horizons, different tasks can be implemented. Three variants exist in reference to the time the operator has the curve displayed.

1.The curve shows the past without the present. Such a curve is called history and is used for analysis. This can refer to a fault analysis but also to an analysis to optimize process control.

2.The curve shows the present with the recent past. This type is called pre-history. It can be used to display a trend. It is the most frequently used type of display regarding process control. From the course, the operator is able to read off qualitative values such as rising, falling, or steady and quantitative values such as the process value at a certain time, or the difference regarding a setpoint.

3.The curve shows the most recent past, the present and the future, and is called prediction display (refer to Figure 2). It is used to predict a process value and allows the user to intervene before the event occurs. To represent the future, the possible value course has to be calculated in advance.

Figure 2: Prediction display according to [2]

In general, the following values can be determined quite well through curves:

–Points in time where striking changes occurred in the course

–Process values at the points in time indicated before

–Gradients at certain points in time

–Dependencies between process values at simultaneous displays

–Extreme values (when and how large)

–Fluctuation ranges

–Deviations from the setpoint

–Frequencies

This variety of characteristics that can be read off shows the importance of curve displays. While the current process values and extreme values that occurred can be represented otherwise -for example, with analog or digital displays- the display of the other characteristics in such a compressed and immediately understandable form is difficult to conceive [3].

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Contents for Integrated Automation Solutions Totally Integrated Automation TIA Industry Sector, IA&DTSCE Training Curriculum PA Module P03-01Continued education Matching SCE Trainer Packages for these curriculumsAdditional information relating to SCE Note on UsageADVANCED LAYOUT OF UIS TRAINING OBJECTIVETHEORY IN BRIEF THEORY HIERARCHY OF FLOW DIAGRAMSMulti purpose plant CURVESThe Purpose of Curves Designing Curve Displays Acquisition and Storage of Curve ValuesUpdates PrehistoryCommissioning Primary TaskProcess Control or AnalysisWorking area ACTIVEX CONTROLSUSER DEFINED OBJECTS LITERATURETASK STEP BY STEP INSTRUCTIONSTRAINING OBJECTIVE PROGRAMMING2. Then, adapt the settings of the plant hierarchy to the expansion. → Tools → Plant Hierarchy → Settings 4. Then, the block icons have to be generated in the new picture Page 13 of 7. Now, once more activate in the ‘Plant View’ Compile and Download Objects. → SCEPCS7Prj → PLC → Compile and Download Objects 9. Now, in the ‘Component view’, start WinCC by highlighting and opening ‘OS1’. → OS1 → Open Object 11. Now, in the Object Properties, first change the geometry corresponding to your resolution for example, 1024x616 at 1024X768 and the background colors to ‘white’. For the color setting to be accepted, the static in the global color scheme has to be switched to ‘No‘. → Object Properties → Colors → Background color → white → Effects → Global Color scheme → No 12. Next, from the project library, drag in the face plate for reactor R001. → View → Library → Project Library → ReactorV10 Page 18 of value 1000 → Minimum value 0→ 17. Now, the display is positioned exactly over the reactor and some levels are moved to the back Arrange → Within the level → One to back for the stirrer, the heater and the labeling to be visible again then open the Properties for additional adaptations. → Properties 19. Then, select ‘Axis‘. Here, set the attribute ‘Scale‘ to ‘No‘ 21. In the object palette, under the tab ‘Control‘ select the WinCC AlarmControl. Then draw a rectangle with the mouse. → Object palette → Controls → WinCC AlarmControl selection by adding message blocks with the buttons message blocks → Online configuration → Online configuration Do not retain → OK 27. Next, select from the object palette, under the tab ‘Control‘, the WinCC OnlineTrendControl. Then, draw a rectangle with the mouse to position the window for the curve view. → Object palette→ Controls → WinCC OnlineTrendControl Page 26 of Page 27 of Page 28 of Page 29 of Page 30 of 1000 ml. → Value axes → Object name Value axis Temperature → Label C → value Value axis Manipulated variable → Level Value axis Level → OK ‘ReactorR001’ 38. Then, highlight all objects and right click on the selection. Now, select ‘Create customized object‘. → Customized object → Create → StaticText2 Text → OK 44. Next, change the name of the user defined object in the library to click on‘’ for ‘Dynamic’ and then select the tag. → → Tag A1multipurposeplant/ T2reaction/reactorR001/ A1T2L001/ A1T2L001/ MonitorA1T2L001/PV#Value → OK 49. Finally, we should position the faceplates picture blocks correctly, label and save them → → Project Library → customObjectreactorV10 53. In the properties you can now access, under ‘UserDefined’, the selected properties of the customObject. Thus, you created an object with a specific selection of properties that can be used again and again quickly and effectively. → Properties → Object Properties → UserDefined TASKS EXERCISES