HEIDENHAIN iTNC 530 Service Manual page 467

Possibilities of The PLC program of the machine manufacturer is in a position to read machine parameters and
the PLC also to overwrite most of them!
During overwriting MPs by the PLC, the values are changed in the run-time memory. The values
of the original MP list do not change!
Another MP file (that of course must exist on the control's hard disk) can be selected by means
of the PLC.
Also so-called MP subfiles (subgroups of the original MP file with partly other values) can be
activated via the PLC. The content of the indicated MP subfile is loaded into the run-time
memory. All MP values not listed in this file remain unchanged.
Remark:
Also the machine operator may change the machine settings. He will mostly increase the
security, e.g., he can reduce the traverse range or the maximum speed, etc.
May 2006
Note
Thus it is possible that the values in the original MP file are not valid in any case.
It is possible that values in the MP list have been changed for testing purposes; with special
machine functions, however, these values are overwritten by the PLC!
If necessary, ask the machine manufacturer in which special operating mode of the machine
which MP files or MP subfiles are active or which parameters are overwritten by the PLC!
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