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The control unit 77
Safe torque off (XSTO, XSTO OUT)
Note: The XSTO input only acts as a true Safe torque off input on the inverter control
unit. De-energizing the STO input terminals of other units (supply, DC/DC converter,
or brake unit) will stop the unit but not constitute a SIL/PL classified safety function.
FSO safety functions module connection (X12)
Refer to the applicable FSO module user's manual. Note that the FSO safety functions
module is not used in supply, DC/DC converter or brake units.
SDHC memory card slot
The BCU-x2 has an on-board data logger that collects real-time data from the power
modules to help fault tracing and analysis. The data is stored onto the SDHC memory
card inserted into the SD CARD slot and can be analyzed by ABB service personnel.
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