maxPAC Hardware Reference Guide
Metso Automation MAX Controls Inc. • 277596 •
11-4
Local Model IOP I/O Bus
Up to 60 BEMs and/or I/O Modules
D
P
U
B
E
I
/
O
B
E
B
E
I
/
O
Remote I/O Bus – Area 3
Up to 60 I/O Modules
Remote I/O Bus – Area 2
Up to 60 I/O Modules
Remote I/O Bus – Area 1
Up to 60 I/O Modules
Redundant Optical Links
Figure 10-2. The DPU Supports up to 60 Modules per Location, the locally, remotely, or both.
In addition to the configuration described in Figure 10-1, BEMs may be non-
redundant, and configured with redundant or non-redundant DPUs. All
options are possible. See " Redundant Configuration Approaches."
DPU Compatibility
The Extender is compatible with 4A, 4B and 4E DPUs, but is not compatible
with the earlier DPU3, DPU4 or controller file models. To use a bus
Extender with DPU 4A and 4B, firmware EPLD may need to be updated.
Contact Metso Automation MAX Controls Customer Care for assistance.
I/O Bus Loading
BEMs may also be used to expand the number of I/O modules that may be
configured locally. The local BEM represents the same bus loading as one
I/O module, regardless of the number of I/O modules attached to the remote
I/O bus. Without the use of BEMs, a single DPU supports up to 60 modules.
When BEMs are used, a DPU could support up to 60 modules per location
(locally, remotely, or both), and up to 255 addresses total for the DPU.
Important: Remember other factors continue to limit the number of
modules you may configure, such as I/O mix, DPU loading, application
requirements, etc. Such sizing factors need to be considered when planning
I/O configurations. See also "BEM Configuration Considerations."
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