BCU-02 3AUA0000110429  BCU-02/12/22 control units

The control unit requires an external 24 V DC power source. It has three option slots for
I/O extensions, encoders and fieldbus adapters, and a removable memory unit. For
example, if you need to replace the control unit, you can keep the parameter settings by
moving the memory unit from the defective control unit to the new one.
The drive-to-drive link (XD2D) is a daisy-chained RS-485 transmission line that allows
basic master/follower communication with one master and multiple followers. The control
unit also has one option slot for connecting a RDCO DDCS communication option board.
For more information, see the RDCO-0x DDCS communication option modules user’s
manual (3AFE64492209 [English]).

BCU-02 3AUA0000110429

The BCU-02 control unit has two fiber optic connections V1 and V2 for connecting to
converter modules. The BCU-12 control unit has one BPEB-05 board, and the BCU-22
control unit has two BPEB-05 boards. Each BPEB-05 board adds five fiber optic
connections. Thus, the BCU-12 has seven connections (V1…V7), and the BCU-22 has
twelve connections (V1…V12).
The maximum lengths of the cables are:
• 1 mm plastic optical fiber cables, 35 m (115 ft)
• 200 μm hard-clad silica fiber cables, 100 m (328 ft).
Fiber optic pairs connected to one control unit must have the same length. With long
distances, cables of different length cause different delays, which can have an unwanted
effect on the operation.

The figures show the layout of the BCU-22 control unit. For the default I/O connection
diagrams and more information on the connections, see the applicable converter hardware
manual.