HF-MES-manual/en/quality_control/spc.md

SPC Render Condition Configuration

1. Function Overview

SPC (Statistical Process Control) render condition configuration belongs to the quality management module of the MES system. It is used to configure data sources, subgroup sampling parameters, and control limits for SPC reports (both variable and attribute charts). Based on the configured SPC render conditions, the system automatically extracts samples from production process data and generates various SPC control charts to help quality managers monitor process stability in real-time.

Core Functions:

• Data Source Configuration: Select data category (process inspection data, process data, result data) and associate SCADA point binding configuration
• Subgroup Sampling Parameters: Configure total subgroups, samples per subgroup, subgroup interval, data cleaning rules
• Control Limits Configuration: Set specification limits (USL/LSL), control limits calculation method, control chart type
• Data Cleaning Rules: Configure outlier filtering rules (by value or by percentage)

Function Screenshot:

2. Term Explanation

Term	Definition	Description
SPC	Statistical Process Control	A quality management method using statistical techniques to monitor and control process variation
Control Chart	Control Chart	A statistical chart with control limits used to distinguish between normal and abnormal process variations
Subgroup	Subgroup	A group of sample measurements collected under similar conditions, used to calculate within-group statistics
UCL	Upper Control Limit	Upper limit in control chart, calculated from process data statistics
LCL	Lower Control Limit	Lower limit in control chart, calculated from process data statistics
USL	Upper Specification Limit	Maximum allowable value for product quality characteristic, defined by product specification or customer requirements
LSL	Lower Specification Limit	Minimum allowable value for product quality characteristic, defined by product specification or customer requirements
XBar	Mean	Arithmetic mean of all sample measurements within a subgroup, reflecting process central tendency
R (Range)	Range	Difference between maximum and minimum values within a subgroup, reflecting within-group dispersion
S (Standard Deviation)	Standard Deviation	Standard deviation of sample measurements within a subgroup, reflecting within-group dispersion
MR (Moving Range)	Moving Range	Absolute difference between two consecutive individual measurements
CPK	Process Capability Index	Measures actual process capability under controlled conditions, considering mean shift
CP	Process Capability	Measures potential process capability (without considering mean shift)
Process Inspection Data	Process Inspection Data	Inspection data collected during first article and circuit inspections on the production line
Process Data	Process Data	Production process parameters automatically uploaded by equipment
Result Data	Result Data	Inspection result data after process completion
SCADA Point Binding	SCADA Point Binding	Binding relationship between data nodes and SCADA collection points
Data Cleaning	Data Cleaning	Filtering and removing outlier data that does not conform to normal distribution
Sampling Interval	Sampling Interval	Time interval between consecutive subgroups (in hours)

3. SPC Render Condition Configuration Interaction

3.1 Add SPC Render Condition

Operation Steps:

1. Go to [Quality Management] → [SPC Statistical Process Control] → [SPC Render Condition Configuration]
2. Click [Add] button
3. Fill in basic configuration information
4. Click [Save] to complete SPC render condition creation

Basic Configuration Field Description:

Field	Description	Required
Process Unit	Select the production process unit to be monitored	Yes
Process Unit Name	Automatically displayed based on selected process unit	Auto
Item Code	Unique identifier for SPC monitoring item	Yes
Item Name	Name of SPC monitoring item	Yes
Status	Enabled/disabled status of the configuration	Yes
Data Category	Type of data source: Process Inspection Data, Process Data, Result Data	Yes

[Note] The process unit must be configured in the system before creating SPC render conditions.

Function Screenshots:

3.2 Data Source Configuration

Data source configuration defines where the SPC report obtains data from. According to the selected data category, the system provides different configuration options.

Data Category Description:

Data Category	Description	Example
Process Inspection Data	Inspection data collected during first article and circuit inspections	Voltage and dimension values measured by inspectors
Process Data	Real-time production parameters automatically uploaded by equipment	Temperature, pressure, speed collected by equipment
Result Data	Test result data after process completion	OCV test voltage, internal resistance, capacity values

Data Source Configuration Field Description:

Field	Description	Required
Data Category	Select data source type	Yes
SCADA Point Binding	Select bound SCADA data point (only for Process Data category)	Conditional
Data Type Mapping	Map collected data type to SPC analysis data type	Yes

Function Screenshots:

3.3 Subgroup Sampling Parameters Configuration

Subgroup sampling parameters define how the system collects and groups data for SPC analysis.

Field Description:

Field	Description	Required
Total Subgroups	Total number of subgroups to collect in a single SPC analysis	Yes
Samples Per Subgroup	Number of sample measurements in each subgroup	Yes
Subgroup Interval	Time interval between consecutive subgroups (in hours)	Yes
Sampling Method	Sampling method: Continuous sampling	Yes

[Important] The product of total subgroups and subgroup interval determines the total time range for SPC analysis data collection.

Function Screenshot:

3.4 Control Limits Configuration

Control limits configuration defines the specification limits and control limit calculation method for SPC control charts.

Field Description:

Field	Description	Required
USL (Upper Specification Limit)	Upper specification limit defined by product specification	Conditional
LSL (Lower Specification Limit)	Lower specification limit defined by product specification	Conditional
Target Value	Target value for process quality characteristic	No
Control Limit Calculation	Method for calculating control limits: 3σ method, etc.	Yes
Control Chart Type	Type of control chart to generate: XBar-R, XBar-S, I-MR, etc.	Yes

[Note] If USL/LSL are not configured, CPK-related indicators cannot be calculated in CPK analysis.

Function Screenshots:

3.5 Data Cleaning Rules Configuration

Data cleaning rules are used to filter outlier data that may affect SPC analysis results.

Field Description:

Field	Description	Required
Enable Data Cleaning	Whether to enable data cleaning function	Yes
Cleaning Method	By value or by percentage	Yes
Upper Bound	Upper limit for filtering (absolute value or percentage)	Conditional
Lower Bound	Lower limit for filtering (absolute value or percentage)	Conditional

[Important] Data cleaning only affects SPC report calculation results and does not modify original data in the MES system.

Function Screenshot:

4. SPC Render Condition Query

Query Conditions:

Query Condition	Description
Process Unit	Filter by process unit
Item Code	Exact query by item code
Item Name	Fuzzy query by item name
Status	Filter by enabled/disabled status

SPC Render Condition List Field Description:

Field	Description
Process Unit	Production process unit being monitored
Process Unit Name	Name of process unit
Item Code	Unique identifier for SPC monitoring item
Item Name	Name of SPC monitoring item
Data Category	Type of data source
Status	Enabled/disabled status
USL	Upper specification limit
LSL	Lower specification limit
Total Subgroups	Total number of subgroups
Samples Per Subgroup	Number of samples per subgroup
Subgroup Interval	Time interval between subgroups (hours)
Control Chart Type	Type of control chart

Function Screenshot:

5. Operation Notes

1. Data Source Dependence: Before configuring SPC render conditions, ensure that the corresponding data category and SCADA point binding have been configured in the system.
2. USL/LSL Configuration: To calculate CPK indicators in CPK analysis, USL and LSL must be configured.
3. Subgroup Configuration: The product of total subgroups and subgroup interval determines the data collection time range. Please configure according to actual production needs.
4. Data Cleaning: Data cleaning only affects SPC report calculation results and does not modify original data.
5. Status Control: Disabled SPC render conditions will not be available for selection in SPC reports.