Drivebus Connection - ABB Advant Controller 80 User Manual

DriveBus Connection

AC 80 User's Manual
The optical DriveBus link (Channel 0 on the NCB board) can be used
for controlling 12 NAMC-based drives, inverter units or supply units.
The connection of multiple drives requires the use of a branching unit
(NDBU), which enables the construction of a logical bus with physical
star topology. Branching units can be chained together.
Branching
Units
CH1
CH0
Up to 12 Drives
(Up to 8 per
branching unit)
Figure 2-8 DriveBus topology.
DriveBus uses a communication speed of 4 Mbit/s (8 Mbit/s
provisional), with a message cycle time of 50 µs (asynchronous). The
specified transfer capability is 20 messages (10 data set pairs) per
millisecond, the maximum being 32 messages/ms.
The DriveBus link can employ both plastic and HCS fibre optic cables.
The use of HCS cables enables higher speed and longer distances; the
maximum length of the bus is 15 m for plastic cable, 200 m for HCS
cable. The communication speed and light intensity are set with
jumpers on the NDBU board.
Chapter 2 – AC 80 Hardware and Connections
AC 80
DRIVEBUS
MSTR
CH0
NDBU
CH2 CH3
CH0
CH0
Drive
Drive
Drive
MSTR
NDBU
CH1 CH2
CH0
CH0
• • •
Drive
Drive
• • •
CH3
CH0
Drive • • •
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