Layout And Connections - ABB ACS880-207 Hardware Manual

132 The control unit

Layout and connections

The layout and connections of the BCU-x2 are shown below.
Description
I/O I/O terminals (see following diagram)
SLOT 1 I/O extension, fieldbus adapter module
connection. (This is the sole location for
an FDPI-02 diagnostics and panel
interface.)
SLOT 2 I/O extension, fieldbus adapter module
connection
SLOT 3 I/O extension, fieldbus adapter module
connection. FSO is not in use in supply
units.
SLOT 4 RDCO-0x DDCS communication option
module connection
X205 Memory unit connection
BATTERY Holder for real-time clock battery
(CR 2032)
AI1 Mode selector for analog input AI1
(I = current, U = voltage)
AI2 Mode selector for analog input AI2
(I = current, U = voltage)
D2D TERM Termination switch for drive-to-drive link
(D2D)
DICOM = Ground selection. Determines whether
DIOGND DICOM is separated from DIOGND (ie.
the common reference for the digital
inputs floats).
7-segment display
Multicharacter indications are displayed as repeated
sequences of characters
("U" is indicated briefly before "o".)
Control program startup in progress
(Flashing) Firmware cannot be started.
Memory unit missing or corrupted
Firmware download from PC to control
unit in progress
At power-up, the display may show short
indications of eg. "1", "2", "b" or "U".
These are normal indications immediately
after power-up. If the display ends up
showing any other value than those
described, it indicates a hardware failure.