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SINUMERIK 840D sl / 828D
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1.18 Write file (WRITE)

Further, using the WRITE command, it is also possible to write data from an NC program to an
external device/external file (also see "Process DataShare - output to an external device/file
(EXTOPEN, WRITE, EXTCLOSE) (Page 605)"). 

16.9 Process DataShare - output to an external device/file (EXTOPEN,
WRITE, EXTCLOSE)
Function
With the "Process DataShare" function, it is possible to write data from a part program to an
external device / an external file; for instance, to log production data or to control additional
equipment at a control system.