Chart#

Chart.Show

Overview#

A Chart is an object that represents a Statistical Process Control (SPC) Chart.

A Chart has a Chart Type, and is associated with a numeric Parameter.

A Chart can also have an associated set of Rules to check for violations and, in the case a violation is found, a Protocol Instance can also be opened automatically by the system. The system comes pre-configured with a set of SPC Rules, which can be extended by the user.

To promote the re-usability of a single chart across different contexts (for instance across different Resources), each Chart is associated with a context information. The Chart Context Information defines the Chart keys (that uniquely identify a Chart) as well as the mandatory context, which needs to be collected when posting data to the Chart. Each unique combination of Chart keys makes up the Logical Chart within a Chart.

A Data Point consists of a sample of data (which may contain many readings) and it is always associated with a Chart and a Logical Chart within a Chart.

To allow the integration between Data Collection and SPC, two context resolution tables exist in the system:

• StepChartContext - maintained at the Step level.
• ResourceChartContext - maintained at the Resource level.

Tying Everything Together#

graph LR
    A1[Parameter] --- Main[Chart]
    A2[Maintenance Activity] --- Main
    Main === L1[Logical Chart]
    L1 === L6[Data Point]
    L6 === L7[Data Point Context]
    L6 === L8[Data Point Reading]
    L8 === L9[Data Point Violation]
    Main === L2[Chart Rule]
    L2 === L4["Rule (SPC)"]
    L2 === L5["Rule (SPC Action)"]
    L2 --- A3[Protocol]
    Main ==== L3[Chart Context Information]
    C1[Resource Chart Context] -.- Main
    C2[Step Chart Context] -.- Main

classDef mermaid_title color:#000, fill:#fafafa, stroke:#fafafa, stroke-width:0x, font-size:100%, font-weight:200;
classDef mermaid_start color:#000, fill:#fafafa, stroke:#fafafa, color:#fafafa, stroke-width:0x, font-size:100%, visibility: hidden;
classDef mermaid_businessdata color:#000, fill:#65CDE8, stroke:#65CDE8, stroke-width:0px, font-size:100%;
classDef mermaid_nonbusinessdata color:#000, fill:#B7DEE8, stroke:#B7DEE8, stroke-width:0px, font-size:100%;
classDef mermaid_entity color:#000, fill:#FB9F53, stroke:#FB9F53, stroke-width:0px, font-size:100%;
classDef mermaid_entitylinked color:#000, fill:#FCD5B5, stroke:#FCD5B5, stroke-width:0px, font-size:100%;
classDef mermaid_context color:#000, fill:#B9CDE5, stroke:#B9CDE5, stroke-width:0px, font-size:100%;
classDef mermaid_optional color:#000, fill:#B7DEE8, stroke:#65CDE8, stroke-width:1px, font-size:100%, stroke-dasharray: 5 5;
class Main mermaid_entity
class A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,A11,A12 mermaid_businessdata
class L1,L2,L3,L4,L5,L6,L7,L8,L9 mermaid_entitylinked
class C1,C2,C3,C4,C5,C6 mermaid_context
class N1,N2,N3,N4,N5,N6 mermaid_nonbusinessdata

click Main "../../business-data/chart"
click A1 "../../business-data/parameter"
click A2 "../../business-data/maintenance-plan"
click A3 "../../business-data/protocol"
click A4 "../../business-data/flow"
click C1 "../../administration/tables/smart-tables/resourcechartcontext"
click C2 "../../administration/tables/smart-tables/stepchartcontext"

Data Points#

All posts to a Chart consist of a Data Point. A Data Point represents a sample unit and may consist of several reading. A Data Point can be:

• Active - by default, whenever a data point is posted.
• Excluded - if the data point has been marked as excluded.
• Edited - if it has been edited after being posted.
• Removed - if the data point has been marked as removed. A removed data point still remains in the database.

The SPC rules are only run when the data point is first posted. If the data point is edited or deleted afterwards, the SPC rules are not run again. The following table lists the different behavior of the Chart depending on the data point Status:

Table: Data Point Status

Sequence Of Steps#

The necessary steps for correctly using a Chart are the following:

1. Create the Chart.