Description recipe

5 Recipes
5.1 Entering the recipe from the operator system
5.2 Basic information for recipe definition
Recipes are entered in a form, which is a sight to single lines of a Excel spreadsheet. The worksheet
line itself defines the parameters needed from the Process Logical Control (PLC) to do the step. Each
step has one line in the worksheet. Each worksheet is one recipe. The worksheet name is the recipe
name.
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Screen for recipe definition
Recipes will be defined in the form shown above. Each register is a step.
It is possible to change values in this form during the recipe is executed. It can take up to 10 seconds
until the new value can be seen on the operator screen. The changes you make at the recipe during
operation are resident and still valid when doing this recipe the next time.
The most important parameter is the condition, where the steps are terminated and the next step is
started. The other input fields allow you to enter the different set-points, ramps, constant values,
on/off-values.
This program can cause an error during evaluation of a macro-program. You should always answer
the Windows-message with “stop program”. In this case the worksheet will appear again and you may
have to start the program again with the button in the recipe-table.
IMPORTANT:
Do not push the „Stop“-Button and the safety question by mistake. Your experiment can be
worthless.
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Important:
To be sure that a recipe value has been taken over into the Excel-worksheet, you have to leave the changed
field button with the “Enter”- button or you have to press the acknowledge button.
To be sure that your recipe has properly taken over all your important changes, just change the Step once
to come back to the original one.
Do not change the name or the place of the data file recipe.xls
5.2.1 Change of Step
The most important parameter is the one where you define how your step is terminated. In this plant
you have the possibilities
"time of step reached"
"temperature of reactor reached"
"pressure of reactor reached" (only possible in overpressure mode)
"dosing mass of liquid feed reached"
"dosing mass of solid feed reached"
"torque of stirrer reactor reached"
"change of step manually"
"purge system w. pressure successful"
"pressure test successful"
5.2.2 Process parameter input
The rest are the process values and set points you can send to the control system during a running
Step. This is more or less self explaining for somebody who knows the plant.
For some set points you have the possibility to enter a value for the Beginning and one for the End of
a Step. A ramp will be calculated between this 2 values. This is only possible for time terminated
steps. If you want a constant value, you have to enter the same value in both fields.
The window structure is dynamic and some values are only visible in a certain constellation. For
example if you are in a step where reaching a certain temperature will terminate the step, nobody
knows exactly when this point is reached. Therefore it does not make a sense to enter a ramp function
for the temperature set point. This is only useful in a time-terminated step. So in this case only one
input field for the temperature set point is given.
IMPORTANT:
If you select or , be sure that your values in the
inertisation sub screen in WinCC are as you want them. They are used and can not be
influenced by the recipe.
DANGER:
If you select be aware of the fact that hydrogen is used to build up
overpressure in any case, except there is Helium connected to the hydrogen input.
5.2.3 Choosing a recipe or create a new one
Recipes can be chosen in the Field right top of the screen left of the button. Please note that
after choosing the recipe you have to press the enter button to show its parameters in the Register.
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To delete recipes you have to go to the Excel worksheet and delete it manually. This is only allowed
for experts.
Important:
Make sure that you have a copy of the file before you delete single tables. Never delete the
table named “data”. It is a necessary table for the start parameters and the file for stored data.
New recipes will always be created on the basis of an existing one. Please press the button top
right of the screen. Choose a recipe as a basis. Enter the name of the new recipe and press .
5.2.4 Step Name and Overview
Under the Tab strip you can enter the name of the Step. The number will be generated automatically
with a proceeding “S” for Step. Short names are recommended to keep the register smaller.
If the register is wider than the screen, small arrows will appear top right which allow you to scroll to
the steps in the invisible area.
With the button you can go
into a screen showing all the
programmed steps.
Selecting and double clicking a step
brings you directly to this step in the
recipe definition screen.
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5.2.5 Paste new steps and delete steps
New steps are generated copying old steps. You just go on the step you want to copy and press the
button. Afterwards you can alter the values.
A selected step will be deleted using the button. It is not possible to undo this operation.
5.2.6 Recipe Start and Stop
Input screen for identification data before the recipe is started
Pressing the button opens another window. Here you have to enter the data to identify your
experiment. It is also used to generate the file name. Therefore it is necessary, that your identification
code is unique. The name of the data file is “Project”_”Experiment No.”_”Experiment Index”.xls. In the
example above it would be P1_A01_21.xls. The data is stored in a folder named “Data” which is a
subfolder of the named as the operator.
The field table length gives you the possibility to define the length of a table of data which you select
by making the cells in line 299 bold which you want to have in there.
Important:
If you press the button during a recipe by mistake and acknowledge the safety Question of
the system with yes, your experiment is stopped.
5.2.7 Data Acquisition
To register the values you have to click the appropriate checkbox “data logging active” top left of the
window.
The button shows another form which will give you the possibilities you need after doing the
experiments. You can generate curves, enter analytical values, show a table of the measured values.
You can also open the files manually. They have a write-protection. The password to change the files
is “example”.
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