| Variable|| OpcUaVariable|| In || The variable to read or write as produced by a [[CreateOPCUAScope (Activity)|Scope activity]].
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| Value|| object|| In InOut || The value to write to the variable. If null, the variable will be read.
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| Connection|| OpcUaServerConnection|| In || If the activity is not embedded with an [[CreateOPCUAScope (Activity)|Scope activity]], a valid connection has to be specified.