This function is used in Python Scripting.


Sets a variable inside a currently running SFC chart.

Client Permission Restrictions

Permission Type: SFC Management

Client access to this scripting function is blocked to users that do not meet the role/zone requirements for the above permission type. This function is unaffected when run in the Gateway scope.


system.sfc.setVariable(instanceId, [stepId], variableName, variableValue)

  • Parameters

String instanceId - The instance identifier of the chart.

String stepId - The id for a step inside of a chart. If omitted the function will target a chart scoped variable. ][optional]

String variableName - The name of the variable to set.

Object variableValue - The value for the variable to be set to.

  • Returns


  • Scope

Gateway, Vision Client, Perspective Session

Omitting the stepId parameter will cause the function to target a chart scoped variable. If the variable is persistent to the whole chart, or used in multiple different steps, then this parameter should be omitted.

If a stepId parameter is used, then the function will target a step scoped variable. The step associated with the stepId must be the currently active step.

Code Examples
Code Snippet
# The following Action step script passes the chart instance ID and step ID to a client message Handler. The message handler can then wait 
# for user input, and then write back to the step variables. 

# The example assumes there is a chart scoped variable called confirmEndChart, and a step scoped variable called "messageSent". 

# Get the instanceId of the current chart.
chartID = chart.get("instanceId")
# Get the id of the step.
stepID = step.get("id")
# Create a payload to pass to the client.
# Include the instanceId and stepId so the script from the message handler knows which
# chart and step to write to.
payload = {"chartID" : chartID, "stepID" : stepID}
# Send the message.
system.util.sendMessage(project = "SFC", messageHandler = "SFCMessage", payload = payload)

# The following script would be placed on a client message handler. This receives the payload, 
# and sets a variable on either the chart or step depending on user selection

# Read items out of the payload.
id = payload['chartID']
stepId = payload['stepID']
# Ask the user to end the chart.
if system.gui.confirm("Would you like to end the process"):
	#If yes, end the chart. confirmEndChart is chart scoped, so only 3 parameters are passed
	#If no, reset the step.messageSent variable so that the user will be prompted again.
	#messageSent is step scoped, so 4 parameters are passed

system sfc setVariable, sfc.setVariable