FAQ about SIMATIC BATCH

Transcription

1 FAQ about SIMATIC BATCH How do I Configure Scaled Parameters? FAQ

2 Table of Contents Table of Contents General Information Task/motivation Definitions Configuring Scaled Parameters in practical Operation Practical example Practical example Interpretation of the Messages Interpretation of the messages when releasing the recipe High limit violated message Maximum quantity too large message Behavior when creating and releasing a batch History This entry is from the Internet offer of Siemens AG, Automation and Drives, Service & Support. The link below takes you directly to the download page of this document. Question How do I configure scaled recipe parameters? Answer The information, instructions and notes listed in this document provide a detailed answer to this question. V1.0 10/10/07 2/15

3 1 General Information 1.1 Task/motivation The SIMATIC BATCH scaling functionality allows the user to formulate unit-independent recipes for a standard quantity thus completely independent of the quantities actually to be produced. It is only when a batch is released that the setpoints are adjusted accordingly and only those units are offered in which the production can be realized with the adjusted selections. This document uses two examples to describe how the system provides optimum support in creating recipes and in using scaled recipe parameters. 1.2 Definitions Reference quantity Reference quantity for quantity scaling characterizes the reference quantity to which all values to be scaled refer. Reference quantity is frequently used synonymously with standard quantity. This can be handled accordingly on a plant-specific basis. However, these things are completely independent of the system and a standard quantity is not defined for SIMATIC BATCH. limits The reference quantity is completely independent of the recipe limits Minimum quantity of a batch or Maximum quantity of a batch. These are the limits that have to be defined for a recipe in the Product tab. Quantity The quantity is neither checked for the recipe limits when creating nor when releasing a batch. To the operator it serves as an orientation or is considered when using the Create batches automatically option. Consequently, batches whose quantity is outside the recipe limit can be created, released and started. Scaled setpoints When using scaled setpoints, a check whether the scaled setpoints are within the limits defined by the object (RPH, ROP) is performed when a batch is released. Candidates that are no longer permissible are removed from the candidate list. It may also occur that a valid candidate for the batch no longer exists. The system supports the planner already in the work in the Editor and shows possible conflicts for the specified quantities. V1.0 10/10/07 3/15

4 2 Configuring Scaled Parameters in practical Operation The following sections use the example of two practical examples to show the configuration of scaled recipe parameters. 2.1 Practical example 1 Table 2-1 The selections of this example are listed in the following table: Designation Reference quantity Reference quantity for quantity scaling REF 120kg Minimum quantity Minimum quantity of a batch 80kg Maximum quantity Maximum quantity of a batch HL 150kg Value Figure 1 parameters The setpoint of the phase considered here has the following unit-specific setpoint limits: V1.0 10/10/07 4/15

5 Table 2-2 Unit Setpoint low limit Setpoint high limit HL Unit_A Unit_B Lowest / highest value If several candidates (units) are possible for the Unit Procedure (RUP) (for example, for Operator selection, Process parameters or The longest out of use ), the lowest low limit (0, 30 > 0) or the highest high limit (100, 70 > 100) of all candidates is indicated for the setpoint to be scaled. To illustrate this, the setpoints are shown in green. (See also Figure 2-2). scal sf When modifying the batch quantity between minimum and maximum quantity, the following scaled setpoints ( scal_xx ) would ensue for the phase ( setpoint in the master recipe). Quantity minimum quantity sf scal_ scal_ Quantity maximum quantity sf scal_hl scal_hl sf scal_xx being the scaling factor for quantity minimum quantity or maximum quantity. For linear scaling Quantity minimum quantity sf REF 80kg 120kg scal_ Quantity maximum quantity sf HL REF 150kg 120kg scal_hl V1.0 10/10/07 5/15

6 For quadratic scaling Quantity minimum quantity 2 80kg 2 sfscal_ REF 120kg Quantity maximum quantity 2 HL 150kg 2 sfscal_hl REF 120kg 2 The scaled values are checked when releasing the recipes or batch and messages are generated or candidates are removed. 2 Calculated setpoint limits as tooltip text To facilitate recipe design for the recipe writer, the limits within which the sepoint may be without violating the setpoint limits for quantities between minimum and maximum quantity are displayed as tooltip text. They are calculated from the conversion of the above-listed formula as follows: _Tooltip sf scal_ HL HL _Tooltip sf scal_hl Figure 2-2, Display of the setpoint limits for several candidates, here Unit_A or Unit_B (in green and associated tooltip text) 0 0 HL HL _Tooltip sf 0, 666 sf 1, 25 _Tooltip skal_ scal_ skal_hl scal_hl V1.0 10/10/07 6/15

7 Figure 2-3, Display of the setpoint limits for one candidate, here Unit_A (in black and associated tooltip text) HL HL _Tooltip sf 0, 666 sf 1, 25 _Tooltip skal_ scal_ skal_hl scal_hl Figure 2-4 The ratios are again to be shown in a chart. Unit_A and Unit_B have the real setpoint limits. Unit_B Unit_A If the quantity was at the permissible high limit HL, the allowed setpoint range Unit_x_scal_HL would ensue for the corresponding unit or, analogously, Unit_x_scal_ for the low limit. This is combined in the Unit_x_range bar. When selecting setpoints from the green section, each quantity between and HL can be selected, whereas the selection of setpoints in the yellow section is limited. V1.0 10/10/07 7/15

8 Figure 2-5 Unit_B_range Unit_B_scal_H Unit_B_scal_L Unit_A_range Unit_A_scal_H Unit_A_scal_L If the setpoint is outside the limits calculated in the tooltip text, this causes a warning when releasing the recipe (see also chapter 3.1 Interpretation of the messages when releasing the recipe), although it is within the setpoint limits, e.g. HL _Tooltip ( 56) < ( 60) < HL ( 70) 2.2 Practical example 2 Table 2-3 The same parameters as in the first example are used. Merely the reference quantity has been reduced from 120kg to 1kg. Designation Reference quantity Reference quantity for quantity scaling REF 1kg Minimum quantity Minimum quantity of a batch 80kg Maximum quantity Maximum quantity of a batch HL 150kg Value In this example, the reference quantity is even outside the recipe limits and thus certainly not identical to a standard quantity. This enables the user to standardize recipes to, for instance, 1kg of final product, the real production volumes deviating considerably from this value. sf 80kg HL 150kg 80 sfscal_hl 150 REF 1kg REF 1kg scal_ The tooltip text then displays the following recommended setpoint limits for several candidates (e.g., operator selection) or one candidate: V1.0 10/10/07 8/15

9 Figure 6 Display of the setpoint limits for several candidates, here Unit_A or Unit_B, in green and tooltip text HL HL _Tooltip 0, 666 sf 80 sf 150 _Tooltip skal_ scal_ skal_hl scal_hl Figure 7 Display of the setpoint limits for one candidate, here only Unit_A, in black and tooltip text 30 0, 375 HL 70 HL_Tooltip 0, 466 sf 80 sf 150 _Tooltip skal_ scal_ skal_hl scal_hl V1.0 10/10/07 9/15

10 3 Interpretation of the Messages 3.1 Interpretation of the messages when releasing the recipe If the Editor detects possible conflicts, it displays corresponding warnings. In our example, two different warnings are generated that examine different views: The same recipe as before is used; setpoint 60; several candidates (Unit_A, Unit_B) Figure 8 Setpoint parameters for which the messages shown below are generated. V1.0 10/10/07 10/15

11 3.1.1 High limit violated message Figure 9 Details on the High limit violated message HL HL REF skal_hl scal_hl The setpoint for the indicated unit (here Unit_A) HL 70 triggers the warning. For a recipe limit HL 150 and reference quantity REF 120kg the scaled setpoint would result from the unscaled setpoint 60; HL REF 150kg kg scal_hl sfscal_hl 75 this scaled setpoint exceeeds the upper setpoint limit. The recipe is still released! V1.0 10/10/07 11/15

12 3.1.2 Maximum quantity too large message Figure 10 Details on the Maximum quantity too large message In this case, the upper recipe limit HL 150 triggers the warning. If the setpoints (and their limits or HL ) are assumed as given or valid, the upper recipe limit HL must not exceed the value HL 70kg HL_max REF 120* kg to ensure that there are no restrictions when releasing the batch. V1.0 10/10/07 12/15

13 3.2 Behavior when creating and releasing a batch In the master recipe, several units (here Unit_A, Unit_B) are to be possible as, for instance, for the Operator selection strategy. A batch with a quantity of 145 is to be created. Figure 11 Details of the created batch V1.0 10/10/07 13/15

14 When releasing the batch, the following message is displayed: Figure 12 Dialog box to inform you that candidates have been deactivated Select Display Results to obtain more details: Figure 13 Details on the deactivation of candidates Unit_A cannot be used since the upper setpoint limit HL is violated by the scaled setpoint Quantity 145kg 60 REF 120kg scal 72.5 V1.0 10/10/07 14/15

15 4 History Table 4-1 History Version Date Modification V1.0 10/10/07 First edition V1.0 10/10/07 15/15