HEIDENHAIN TNC 320 (340 55x-04) Cycle programming - Manual (Page 6)

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Feature content level (upgrade functions)
Along with software options, significant further improvements of the
TNC software are managed via the Feature Content Level (FCL)
upgrade functions. Functions subject to the FCL are not available
simply by updating the software on your TNC.
Upgrade functions are identified in the manual with FCL n, where n
indicates the sequential number of the feature content level.
You can purchase a code number in order to permanently enable the
FCL functions. For more information, contact your machine tool
builder or HEIDENHAIN.
Intended place of operation
The TNC complies with the limits for a Class A device in accordance
with the specifications in EN 55022, and is intended for use primarily
in industrially-zoned areas.
Legal information
This product uses open source software. Further information is
available on the control under
U Programming and Editing operating mode
U MOD function
U LICENSE INFO soft key
All upgrade functions are available to you without
surcharge when you receive a new machine.