1208 HEIDENHAIN Technical Manual iTNC 530 HSCI
Datum
management via
preset tables
Presets are managed with the TNC:\PRESET.PR preset table.
With MP7294, disable the "datum setting" function in the preset table for
specific axes.
Each traverse range uses its own preset table. The preset table of the current
traverse range can be viewed in the Manual operating mode. FN17: SYSWRITE
and FN18: SYSREAD refer to the active preset table.
FN17: SYSWRITE ID503 is used for entering a value directly (i.e. without
conversion) into the preset table. This way a defined state can be set as a
default value in the preset table.
FN17: SYSWRITE ID502 and FN18: SYSREAD ID502 are used for entering a value
with conversion into the active coordinate system or preset table, or for
reading it.
The PR.LINESLOCKED = entry in OEM.SYS is used to write-protect lines in the
preset table, such as for the machine datum. Separate each line number with
a comma, and connect line ranges with a dash: PR.LINESLOCKED = 1,4-8,22.
Write-protection can only be assigned to the first 255 lines. Write-protected
lines are shown in a different color. The active line and line 0 are always write-
protected. The manually set datum, which was set by the user with the axis
keys, is automatically written into line 0 of the preset table.
When the control is started up, new cycle data is generated (with or without
support from the preset table).
It is also possible to take the presence or absence of the preset table into
account in OEM cycles. See page 1704.
MP7268.x is used to hide the columns of the preset table, or to sort them as
desired. MP7268.x is used to define the sequence of the columns. If
MP7268.x = 0, the respective column is not displayed and is not saved during
external data backup.
The values in preset tables are shown in inches if the control was set to
inches. When the files are output, the data will be saved without unit, i.e.
converted files must always be interpreted in mm format.
The currently effective datum, but not the corresponding value in the preset
table, is overwritten with FN25: PRESET.
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