HEIDENHAIN TNC 410 M Technical Manual page 48

1 New Version: Update Information No. 9
1.1 Important Note
April 2011
When the control system boots up, the electronic ID labels of the connected
devices are read out and compared to the hardware configuration last
identified. The problem described below can occur in control systems with a
larger number of power modules.
Description of the problem:
If you are using a UV(R) 1xxD power supply unit, propagation times and
capacitive influences can, in rare cases, cause a misinterpretation of the
dynamic signals while the electronic ID labels of the power supply units and
the power modules are being read out. This can lead to errors during the
reading process, or to the overwriting of the electronic ID labels of the
connected power supply units and power modules. The fault described is only
relevant under the following conditions:
iTNC 530 control with HSCI, or NCK-based controls as of the software
versions listed below, and
a UV(R) 1xxD power supply unit, and
a larger number of power modules at the unit bus X79 of a UV(R) 1xxD
power supply unit.
The fault can sometimes also occur in standard machines with a small
number of power supply modules. However, the fault probability increases
with the number of power modules used.
After the problem described above has occurred, the error dialog "Hardware/
firmware change detected" appears when the control boots up. This might be
due to the problem described above, unless it happens during commissioning
of the control, or after a HEIDENHAIN device has been replaced and/or
connected or disconnected.
You can continue working with the control without restrictions if you close the
error dialog by pressing "Accept." However, the recurrence of the error dialog
is to be expected. If the fault occurs, HEIDENHAIN recommends that you
contact the responsible HEIDENHAIN service agency so that the fault is fixed
permanently.
Affected software versions:
iTNC 530 HSCI: SW 606 42x-01
TNC 620: as of SW 340 56x-01
MANUALplus 620: as of SW 548 328-01
CNCPILOT 620: as of SW 688 945-01
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