How to read in function block diagram Internal PID Function Block parameters
Is it possible to read with a software instruction in a function block diagram, an internal paramater of a PID Function Block (Ex : Internal Setpoint .Wi extension) and what is the syntax of the variable because if the name of the PID Function is FIC200, FIC200.Wi is not recognized.
Thanks for your help
As far as I know, Function block parameters are for setting/configuring block and few of them for read/write from faceplate or from graphic(via OPC).
Can not see/use parameters with software instructions in CBF/Freelance engineering.
dot(.) extension works for function block input/output pin as a variable, in ST language while dealing with function blocks. So while dealing with function block in ST language if you want to set function block parameter just double click on functionblock TAG name and parameter window will appear.
And some parameters can be read or written via faceplate...e.g. internal/external setpoint but can not be programmed or used as variable in logic.
But could be possible to use in some external programming editor as software instruction, when brought there via OPC may be...
Why do you need the internal parameters of a Function Block?
Most of them should not be changed from logic - for example the internal setpoint is used in operator station and as such You should not change it in logic. Other parameters are for visualization and shouldn't be changed from the visualisation.
Maybe there is a solution for what You need, but to help You we would need to know what it exactly is.