21 – 338 HEIDENHAIN Service Manual iTNC 530 HSCI
21.1.4 Reading out power module data
When the control is started up, the CC 61xx controller unit fetches the data (ID number, serial number,
etc.) of the HEIDENHAIN power modules (UM xxx D) via the PWM ribbon cables.
The sequence for reading out is defined by the HSCI addresses of the controller basic boards
(MP108/MP109) and the connectors (X51, X52 and following) on the CC 61xx. This means that the
data of the power module connected to X51 of the first controller basic board is read out first, etc.
While the data is being transferred, the corresponding SH 2 LED blinks rapidly.
If, however, PWM cables that lead to two different power modules were swapped for error
localization, the control generates the message Hardware/firmware change detected during start-up.
Figure: Control display, if PWM cables were swapped
8 Accept the change to continue error localization.