HEIDENHAIN ITNC 530 - 6-2010 DIN-ISO PROGRAMMING User Manual page 412

Overlap between M128 and M114
M128 is a new development of function M114.
M114 calculates necessary compensation movements in the
geometry, before the respective NC block is executed. The TNC then
processes the compensating movement such that it is performed by
the end of the respective NC block.
M128 calculates all compensating movements in real time. The TNC
performs necessary compensating movements immediately as soon
as they become necessary after movement in a rotary axis.
M114 and M128 may not be active at the same time, since
overlaps of the two functions would occur, which could
lead to damage of the workpiece. The TNC outputs a
corresponding error message.
412 Programming: Multiple Axis Machining