HEIDENHAIN TNC 320 (340 55x-04) ISO programming - Manual (Page 198)

198 Programming: Q Parameters
8.1 Pr
inciple and Ov
erview
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 246).