Rockwell Automation MRB01XS Remote Bus Extender Slave Module - Manual (Page 7)

MRB01XS October 2005 – Issue 4 7
Triguard SC300E MRB01XS Remote Bus Extender Slave Module
Remote chassis address selection is controlled from the associated remote bus extender
master module MRB04XM. Refer to the Remote Bus Extender Master Module User Manual
(Ref 008-5117) for details. There are no address setting links or switches on the MRB01XS
itself. The chassis address setting links ‘UNIT ID 0 to 3’ at the rear of the remote chassis
backplane are not used. Links fitted in these positions will have no effect.
The primary function of the MRB01XS is to respond to remote chassis I/O module read/write
requests received via the fibre optic data link.
The presence of the fibre optic data link precludes the use of a serial communications module
in a remote chassis. All other types of I/O module are supported.
The module provides identical timing for remote chassis I/O operations as the MPP provides for
main chassis I/O operations.
Although the MRB01XS is part of a triplicated system, the module itself is simplex in
operation. Redundancy derives from the fact that there are three such modules in each remote
chassis.
The MRB01XS supports both single and dual slot hot repair.
Figure 2-4 shows the main functional areas of the MRB01XS circuit. Buffers regulate the two-
way flow of data and control signals through the module, under the overall control of the control
logic.
Power supplies
A pair of auctioneering diodes combines the two 5.4Vdc power supplies from the chassis-
mounted PSUs into a single 5Vdc (nominal) supply for the module. Capacitive decoupling and
overcurrent protection is provided.