Rockwell Automation MRB01XS Remote Bus Extender Slave Module - Manual (Page 6)

6 MRB01XS October 2005 – Issue 4
Triguard SC300E
EXPANSION BUS
Expansion bus architecture
The main and any local extension chassis are interconnected by ribbon cables running
between expansion bus connectors ‘e’ on their respective chassis backplanes as shown in
Figure 2-2 . The expansion bus may be further extended to up to four remote chassis per
master module (up to an overall maximum of 15 chassis per SC300E system) by means of
fibre-optic cables terminated at master and slave remote bus extender modules.
The maximum number of remote chassis per SC300E system is eleven—given by the
combination: 1 x main + 3 x local + 11 x remote = 15 chassis total.
Figure 2-2 Bus extension to remote chassis
NOTE
The Remote Bus Extender Slave Modules will only support the chassis in which they are fitted.
Additional chassis CANNOT be added to a Remote Extension Chassis.
THEORY OF OPERATION
Figure 2-2 shows the general architecture of the system and identifies the position of the
MRB01XS. The overall function of the system is to interface the I/O modules of the remote
chassis with the processors in the main chassis. At a local level, the MRB01XS terminates
one end of the fibre optic data link, operating as a slave to the associated master module at
the other end of the link.