The DeltaV system uses parameters in function blocks, modules, I/O configuration and diagnostic functions. Parameters provide the user with variables that individually are given constant values for specific applications and can denote the application. This allows the user to configure the logic in a block or module, read or write to a specific I/O channel or card type, or diagnose a system problem.
When using the value of a parameter from a function block in your control strategy, the function block must execute before attempting to read the value of that parameter.