Image Processing Reference
In-Depth Information
Application
design
Resource
management
Configuration
management
EDD
management
HMI and
maintenance
TCP/IP
Generic interface
Fieldbus
MIBs
Database
repository
Manager
System
configuration
Client interface
Application
information
TCP/IP
Fieldbus serve r
APIs SNMP HTTP
OLE
Server logic
(agent)
Fieldbus interface
MIB
images
Application root
Network root
MIB
Network
Group
Field device
Application
instance
Segment
Node
MIB
Virtual device
Field device
Mappings
MIB
Communication
objects
Field device
FIGURE .
NOAH system architecture.
The NOAH system architecture shown in Figure . is a two-level manager/agent relation like
the one suggested in Ref. [], but more flexible. It consists of gateways (called fieldbus servers) that
connect different fieldbus systems to a more general IP-based network and exchange data with a
superordinate management application controlling the data base repository. External engineering
or maintenance tools in turn access the data base repository manager to interact with the entire
system.hecoreofthedatamodelinNOAHreliesonamanagementinformationbase(MIB),a
term borrowed from the ISO network management model which reminds of the primary intention
of the NOAH project to tackle the management of fieldbus installations [].
The MIB follows a clearly structure-oriented approach with the hierarchy levels: network—
representing the individual fieldbus installations; segment—for further distinction inside larger
installations; node—the individual devices; virtual device—distinct functions inside the device; com-
munication objects—actual fieldbus objects. All objects have dedicated attributes specifying details.
For a management application, usually more interested in functionality than structure, an alternative
view on the MIB can be defined. Like in OPC, the application view comprises grouping and appli-
cation instance objects; the two views are connected by appropriate mappings between application
instances and virtual device objects.
 
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