LMES Inbound Processing Logic Detailed Explanation

1. Overview

Inbound Processing (Inbound) is the operation performed when a product arrives at a workstation and is ready for processing. It validates the product's eligibility for the current station and prepares the execution environment.

2. Logical Flow

2.1 Trigger Method

• Scan Trigger: Worker scans the product barcode.
• RFID Trigger: RFID reader detects the product tag.
• PLC Trigger: Equipment sensor detects product arrival.

2.2 Processing Steps

1. Identification: Parse the input code to identify the product (Product ID) or Tray (Tray ID).
2. Route Validation:
   • Check if the product has completed the previous process.
   • Check if the product is skipped or routed to this station correctly.
   • Verify if the current station matches the next required process in the route.
3. Status Check: Ensure product is not "Scrapped" or "Hold".
4. Resource Check:
   • Check if required materials/tools are loaded and valid on the station.
   • Check if the machine is in "Ready" state.
5. Action:
   • Pass: Update status to "Processing", record Inbound time (StartTime).
   • Fail: Alert user with specific error message (e.g., "Wrong Route", "Material Depleted").

3. Key Considerations

• Re-entrant Inbound: If a product is scanned again at the same station while "Processing", the system should typically ignore or prompt "Already Inbound", rather than erroring out or resetting.
• Bypass Logic: Support special bypass logic for rework or fast-track products.

4. Code Snippet

public async Task ProcessInboundAsync(InboundInput input)
{
    var product = await _productManager.GetByIdAsync(input.Barcode);
    
    // Validate Route
    var nextStation = await _routeService.GetNextStationAsync(product.Id);
    if (nextStation.Id != input.CurrentStationId)
    {
        throw new BusinessException("Product is at wrong station. Expected: " + nextStation.Name);
    }

    // Update Status
    product.Status = ProductStatus.Processing;
    product.CurrentStationId = input.CurrentStationId;
    product.StartTime = DateTime.Now;
    
    await _repository.UpdateAsync(product);
}