Siemens SINUMERIK 840C Installation Manual page 122

12.93 5 PLC Interface
5.1.2 Data blocks (DB)
DB 150 to DB 182 can be required for the tool management.
The number of data blocks actually required depends on the "width" of
the magazine table.
Data blocks DX 0 ... 105 are reserved for SIEMENS applications.
Data blocks DX 106 ... 225 can be used by the user.
5–5
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SINUMERIK 840C (IA)