Does anyone know where I can find the DB's in the PLC logic that stores the tool data for tools currently loaded in the spindle?  Everything I read from tool management manual says DB72 but I see no data change from DB72 as tool is loaded or unloaded.  I believe that data field $TC_TPC2 is a OEM user data that is not being used. 

https://support.industry.siemens.com/cs/ae/en/view/40922628

Thanks

840D SL with PCU50 with operate V04,5 sp01HF03

NCU 720.3

In general, NC data is not directly visible to the PLC.  You must use NC-VAR select with FB2 to read specific data.  DB72 only contains data relevant to a tool change, like tool status, pocket locations and oversize info.

If you need this data at a tool change event, and you have an M6 subroutine, you can use another method, like Dual Port memory or H codes to transfer specific values to the PLC.

HTH,

SteveA