maxPAC Hardware Reference Guide
Metso Automation MAX Controls Inc. • 277596 •
11-8
1. Remote I/O only (redundant, common or mixed).
2. Remote I/O and local redundant I/O.
3. Remote I/O and local common I/O.
4. Remote I/O and mixed local I/O consisting of common and redundant
configurations.
Configuring Remote I/O only
In a redundant configuration using only remote I/O (configuration scheme
No. 1), the local DPUs and associated BEMs are placed in one rack. The
IOP381 4-wide rack is used for this application. The DPU4E chassis are
mounted at either end of the rack. The BEMs are installed next to each DPU
using the IOP015 Chassis. Resistor R1 located in the center of the backplane
must be removed to isolate the “active” DPU control line.
Configuring Local Common I/O
In a redundant DPU configuration using local common I/O (configuration
scheme No. 3), the I/O bus “active” control signal from each DPU must be
connected to its associated BEM only. A special cable (Part No. 047374)
must be used to connect the local I/O bus between the racks housing each
DPU. When this cable is used, jumpers in the following module types must
be set up for common I/O as follows:
§ Analog Output – W4 installed
§ Thermocouple – W2 installed
§ RTD – W2 installed
Configuring Mixed Common and Redundant I/O
Configurations with mixed redundant and common I/O can be used at either
the local or remote end. The I/O bus from each DPU at the local end or each
BEM at the remote end is connected separately to the redundant modules. A
mixed backup adapter, (Part No. 080441) is used to combine the redundant
I/O buses into a common I/O bus. See Figure 10-4.
At the remote location, the I/O bus connections to the BEMs end must be
isolated only for redundant I/O applications. For common I/O applications
the two remote BEM modules, connected to primary and secondary DPUs,
are connected to the same Parallel I/O backplane or daisy chained Parallel
I/O backplanes.
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