Rockwell Automation MBB BUS Extender Module - Manual (Page 5)

MBB October 2005 – Issue 4 5
Triguard SC300E MBB Bus Extender Module
Figure 2-1 Local chassis interconnections
Table 2-1. Connector location and type
Connector Location Type
J1 (I/O bus) MBB rear edge (Figure 1-1) 96-pin DIN 41612 type C male
J2 (expansion bus) MBB rear edge (Figure 1-1) 96-pin DIN 41612 type c male
e (expansion bus) Rear of backplane (Figure 2-2) 96-pin DIN 41612 type C female
CONTROLS AND INDICATORS
The MBB has no user controls. The single Health indicator (green LED) on the front panel
illuminates in normal operation.
THEORY OF OPERATION
The main functional areas of the MBB circuit are shown in Figure 2-4. Buffers regulate the two-
way flow of data and control signals through the module, under the overall control of the Control
Logic. The MBB provides identical timing for local chassis I/O operations as the MPP provides
for main chassis I/O operations.
Although the MBB is part of a triplicated system, there is no redundancy in the module itself.
Redundancy derives from the fact that there are three MBBs in each local chassis.