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Terminate the I/O bus at its physical ends:
1.
Set the termination resistor switch of the CIO-01 module on the end of the I/O
bus to ON position.
2.
Set the X485 termination switch (X485 TERM) of the UCU control unit to ON
position to terminate the other end of the I/O bus.
3.
Set the termination resistors of all other CIO-01 modules to OFF position.
Make sure that two devices in the I/O bus have the biasing on:
1.
Set the X485 bias switch (X485 BIAS) of the UCU control unit to ON position.
2.
Make sure that the termination resistor switch in one of the CIO-01 modules is
set to ON position. This automatically starts the biasing.
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, with BCU only)
￭
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.
Note: Control units that have a sticker with the text "No FSO support" are not
compatible with the FSO safety functions module.
SDHC memory card slot
￭
The BCU control unit 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.
MicroSDHC memory card slot
￭
The UCU-22...24 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
microSDHC memory card inserted into the UMU memory unit and can be analyzed by
ABB service personnel.
The control unit 123
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