Bus Extender Unit Module IOP371
Metso Automation MAX Controls Inc. • 277596 •
11-3
using redundant Distributed Processing Units (DPUs), an I/O cabinet
installed locally in a control room contains I/O modules, a DPU pair, and a
BEM pair. This is connected via I/O optical cables to a ruggedized remote
cabinet containing I/O modules, and a second BEM pair. The optical link is
established between the local and remote Extender modules as shown in
figure 10-1.
Local I/O Bus
D
P
U
B
E
I
/
O
B
E
B
E
I
/
O
Remote I/O Bus
Optical Links
D
P
U
“Y“ Cable
I
/
O
I
/
O
Optical Links
B
E
I
/
O
I
/
O
Figure 10-1. Optical Link between Local and Remote Extender Modules
Multiple BEMs can be connected to the I/O bus to allow multiple remote
locations for I/O. When multiple BEM modules are connected to different
parts of the system, all BEMs connected to a DPU must share the same I/O
bus as the DPU, as shown in figure 10-2. See also, "Redundant
Configuration Approaches."
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