HEIDENHAIN iTNC 530 (34049x-08) - Manual (Page 648)

648 MOD functions
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17.2 Software numbers
Application
The following software numbers are displayed on the TNC screen
after the MOD functions have been selected:
 NC: Number of the NC software (managed by HEIDENHAIN)
 PLC: Number and name of the PLC software (managed by your
machine tool builder)
 Feature Content Level (FCL): Development level of the software
installed on the control (see "Feature content level (upgrade
functions)" on page 9). The TNC displays --- on the programming
station, since there is no Feature Content Level there.
 DSP1 to DSP3: Number of the speed controller software
(managed by HEIDENHAIN)
 ICTL1 and ICTL3: Number of the current controller software
(managed by HEIDENHAIN)