OEM made a retrofiti with S7-1500 CPU & HMI KTP700, but in this TIAPORTAL wincc Project I cant add new tag, it show me an error with the next message "The number of used tags 802 exceeds system limit of 800", So this tell me that the KTP700 has a limit of tags or tiaportal is the problem?

Hello friend,  you can create an array in a non-optimized db in your plc and link it to an array in your ihm tag table. For example: an array with 5 elements of type real. You will have 5 real variables, however, for the IHM it will only be one tag, as it understands an array with just one tag.

Note: do not forget to declare in the ihm table that the addresses are absolute.