Parameter Transfer

Introduction

Parameter Transfer Activity is used to monitor trigger signal variables. When the trigger signal changes, it transfers the value of the source variable to the target variable. This node adopts a subscription mode and continuously monitors variable change events.

Configuration Items

Property Name	Display Name	Type	Required	Default Value	Description
Node Name	Node Name	String	Yes	Parameter Transfer	The name of the node in the flow
TransferSuccessWriteValue	Transfer Success Write Value	int	No	1	Value written when transfer succeeds
TransferFailWriteValue	Transfer Fail Write Value	int	No	2	Value written when transfer fails
IsRestVerificationResult	Reset Verification Result	bool	No	true	Whether to reset the transfer result when the trigger signal resets
TransferRestWriteValue	Reset Result Write Value	int	No	0	Value written when resetting
ReadRetryCount	Read Retry Count	int	No	10	Retry count for reading variables
ReadRetryDelay	Read Retry Delay	int	No	500	Delay for read retry (ms)
WriteRetryCount	Write Retry Count	int	No	10	Retry count for writing variables
WriteRetryDelay	Write Retry Delay	int	No	500	Delay for write retry (ms)
StringTypesResetValue	String Type Reset Value	string	No	string.Empty	Reset value for string type variables
DecimalTypesResetValue	Decimal Type Reset Value	string	No	0	Reset value for numeric type variables
OtherTypesResetValue	Other Type Reset Value	string	No	null	Reset value for other type variables

Business Logic

Execution Flow

Enter Node
  │
  ▼
Check if station and function are enabled
  │
  ├─► Not Enabled → Log and return
  │
  ▼
Get parameter transfer configuration list
  │
  ▼
Create variable monitoring channel
  │
  ▼
Subscribe to variable change events
  │
  ▼
Wait for variable change
  │
  ├─► Trigger Signal = 1 → Execute Transfer
  │     │
  │     ├─► Read source variable
  │     ├─► Write target variable
  │     └─► Write transfer result
  │
  └─► Trigger Signal = 0 → Execute Reset
        │
        ├─► Reset transfer result
        └─► Reset target variable (optional)

Parameter Transfer Configuration

Each parameter transfer group contains the following configuration:

Configuration Item	Description
Name	Parameter Name
TransferSignal	Trigger Signal Variable
SourceVariable	Source Variable (Read)
TargetVariable	Target Variable (Write)
TransferResult	Transfer Result Variable

Flow Data Items

Output Data Items

Data Item	Type	Description
{ParameterName}_TransferVariable_Value	string	Transferred variable value
{ParameterName}_TransferResult_Value	bool	Transfer result
{ParameterName}_ParameterTransfer_Counter	int	Transfer counter
{ParameterName}_ParameterTransfer_Result	DataItemCollection	Transfer result collection

Usage Example

Basic Configuration

<ParameterTransferActivity Name="Parameter Transfer">
  <TransferSuccessWriteValue>1</TransferSuccessWriteValue>
  <TransferFailWriteValue>2</TransferFailWriteValue>
  <IsRestVerificationResult>true</IsRestVerificationResult>
  <TransferRestWriteValue>0</TransferRestWriteValue>
</ParameterTransferActivity>

Process Model Configuration

Parameter transfer configurations are defined in ParameterTransfers of the process model:

{
  "ParameterTransfers": [
    {
      "Name": "Product Code Transfer",
      "TransferSignal": "Transfer_Trigger_1",
      "SourceVariable": "PLC_SerialNumber",
      "TargetVariable": "MES_SerialNumber",
      "TransferResult": "Transfer_Result_1"
    }
  ]
}