HEIDENHAIN TNC 620 User Manual page 10

Fundamentals
Optional parameters
Optional parameters
The comprehensive cycle package is continuously further
developed by HEIDENHAIN. Every new software version thus
may also introduce new Q parameters for cycles. These new Q
parameters are optional parameters, some of which have not been
available in previous software versions. Within a cycle, they are
always provided at the end of the cycle definition. You will find an
overview of the optional Q parameters that have been added with
this software version in the "New and changed cycle functions of
software 81760x-02" section. You can choose whether to define
optional Q parameters or delete them with the NO ENT key. You
can also adopt the default value. If you have accidentally deleted an
optional Q parameter or if you would like to extend cycles in your
existing programs after a software update, you can include optional
Q parameters in cycles when needed. The following steps describe
how this is done:
To insert optional Q parameters in existing programs:
Call the cycle definition
Press the right arrow key until the new Q parameters are
displayed
Apply the default value or enter a value
To transfer the new Q parameter, exit the menu by pressing
the right arrow key once again or by pressing END
If you do not wish to apply the new Q parameter, press the
NO ENT key
Compatibility
The majority of part programs created on older HEIDENHAIN
contouring controls (TNC 150 B and higher) can be executed with
this new software version of the TNC 620. Even if new, optional
parameters ("Optional parameters") have been added to existing
cycles, you can normally continue running your programs as usual.
This is achieved by using the stored default value. The other way
round, if a program created with a new software version is to be
run on an older control, you can delete the respective optional
Q parameters from the cycle definition with the NO ENT key.
In this way you can ensure that the program will be downward
compatible. If NC blocks contain invalid elements, the TNC will
mark them as ERROR blocks when the file is opened.
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HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015