Programming Notes - HEIDENHAIN iTNC 530 User Manual

Programming notes

You can mix Q parameters and fixed numerical values within a
program.
Q parameters can be assigned numerical values between 999 999 999
and +999 999 999, meaning that up to nine digits plus the algebraic
sign are permitted. You can set the decimal point at any position.
Internally, the TNC can calculate up to a range of 57 bits before and
7 bits after the decimal point (32-bit data width corresponds to a
decimal value of 4 294 967 296).
You can assign a maximum of 254 characters to QS parameters.
Some Q and QS parameters are always assigned the
same data by the TNC. For example, Q108 is always
assigned the current tool radius (see "Preassigned Q
Parameters", page 308).
If you are using the parameters Q60 to Q99 in encoded
OEM cycles, use MP7251 to define whether the
parameters are only to be used locally in the OEM cycles
(.CYC file), or can be used globally for all programs.
With MP7300 you specify whether the TNC should reset
Q parameters at the end of the program, or if the values
should be saved. Make sure that this setting does not
have any effect on your Q parameter programs!
276 Programming: Q-Parameters