By Dietmar Loy, Dietmar Dietrich, Hans-Jörg Schweinzer
Control networks span quite a lot of software parts. those networks are placed into motion within the `Digital Home', business functions, advertisement constructions, transportation structures, gasoline stations, safeguard platforms, and they're present in such a lot situations the place clever sensors and shrewdpermanent actuators are used to interchange details. The authors of this quantity offer an outline of varied keep an eye on community protocols and talk about LonTalk® protocol, Neuron® chip, programming version, community constructions, community administration, interoperability among nodes, software profiles, improvement and upkeep instruments, functionality research, and standardization actions.
Open regulate Networks: LonWorks/EIA 709 Technology should be a major source for complex scholars of keep an eye on structures and embedded platforms, engineers designing allotted networks, platforms designers and designers, and others constructing shrewdpermanent structures and clever transportation systems.
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Additional info for Open Control Networks: LonWorks/EIA 709 Technology
Example text
The result is nondestructive access. The message with the lowest identifIer ('000 ... ') has the highest priority and a guaranteed delay time. Messages with lower priorities can have large delays if the bus traffic is high. This disadvantage can be eliminated if in level 7 of the ISO/OSI structure an algorithm is integrated which is able to assign the nodes new identifIers. _ . - .. --_. _--,------ (b) Figure 1-25: Principle of a CAN bus driver It is very important to point out the aspect of safety in CAN.
The system will be more transparent and more flexible. The total meshed and the heterogeneous net structures still don't have any relevance in the area of FANs. The total meshed net structures are mostly found in safety relevant systems, for example in airplanes like the airbus, or in computer systems for banks or insurance companies. Heterogeneous net structures can be subdivided into line, ring, and other net structures, where the coupling elements have application specific aspects and are of no importance here.
But the token principle guarantees a deterministic behavior of the system, a decisive advantage of PRO FIB US. Two priority levels are defmed, and a master, dealing with a massage of priority one, has the precedence in opposite of a node with a lower priority. A high priority access is activated when the preceding activity of a master is fmished. If a node, for example a master, has to be replaced by another one or has to be added to the system, the system is not to be new initialized; the node is to connect and to start in a running system operation.