Site has installed and "Tuned" a few PIDs and Float (FLT) modules in the controller but is not able to tune the last module added. What may be wrong? (History – Tuning)
Due to the memory required for the tuning function, there is a limit of four modules that can be contained in the history record of each controller.
If an additional module is needed, an old one must be deleted first.
For more information refer to the System Operator Guide or TCON 083.