Installation guide

Extending the Island Bus
66
890USE17100 September 2003
Preferred
Modules
Preferred modules must also be equipped with input and output IEEE 1394-style
connectors to receive and extend the island bus signals to other extensions. It is
possible, for instance, to extend the island bus from a primary segment to a
preferred device, and then from that preferred device to an extension segment of
Advantys STB I/O.
CANopen
Extension
Module
If you want to put standard CANopen devices on an island bus, you need to make
the extension from a segment of STB I/O modules. The last module in the segment
needs to be an STB XBE 2100 extension module. The CANopen extension module
has a five-pin connector on it that can be used with any standard CANopen cable.
You must supply this cable. A CANopen extension module passes island bus
communications only. It does not pass power or addressing. For more intsallation
information see Standard CANopen Devices, p. 22.
Length of the
Island Bus
The total length of an island bus cannot exceed 15 m (49.2 ft). This is the maximum
length of the island bus, from the NIM in slot 1 to the 120 Ω terminator at the end of
the last device on the island. It includes the sum of the lengths of all the extension
cables as well as the lengths of the hardware modules themselves.
Note: The use of CANopen devices on systems using 800 kBd reduces the
maximum length to 6.5 m (21.3 ft).