VMIPMC-5565 Gas turbine electrical module

　Message transfer on the Advant Fieldbus 100 is used for EventSet, diagnostics, and for loading PC programs to remote Advant Controller 70, 110 or 160 stations. The communication layers in the communication interfaces and the Advant Controller provide a transparent means of communication.The Advant Fieldbus 100 runs at a data rate of 1.5 MBits/second. Some of the information is, however, used for preambles and protocol overhead, so the net data rate will be somewhat less. Bus Load Calculation on 2000 meters The Busload in percent is calculated according the following formula: Busload = AF 100 Station(load) + CI810/CI820(load) + S800 module(load) + DSP(load)

Bandwidth fragmentation

   All load calculations that are shown in the previous chapters concerns calculations of the average busload. There is however one additional factor that must be considered when configuring the Advant Fieldbus 100, that is bandwidth fragmentation. It can not be taken for granted that the bus can use all of the 70% (2000 m) or 50% (8500/15000 m) bandwidth. Bandwidth fragmentation means that the 1 ms time slots can not house a CDP even though the CDP load would below the maximum 70% (2000 m) or 50% (8500/15000 m).Bandwidth fragmentation on a bus configured for 15000m: In Figure 56 two 32 bytes CDPs, CDP1 and CDP2, are configured with cycle time 2 ms each. These cause a bus load of 40,9%. One additional 32 bytes CDP (CDP 3) in Figure 56 with cycle time 1024 ms would cause additional 0.4% busload. This makes the total busload 41.3% which is less than the 50% limit. It is though not possible to add CDP 3 since it is only 10001 - 2*412 = 176 microseconds left in each time slot

Transmission Constraints

   Due to the organization of the scan table (and the entire operating principles of the communication interface firmware) some constraints are imposed on the Advant Fieldbus 100 transmissions. In order to guarantee that message transfer is possible, at least 25% of the time slots on 2000 meter and 50% on 8500 and 15000 meters are reserved for message transfer Bandwidth fragmentation appears on 2000 m, 8500 m and 15000 m bus lengths but is more obvious the longer bus length that is used since the transfer times for each CDP increases with the bus length. Due to bandwidth fragmentation the guaranteed achievable CDP busload is 33.4% for 8500 meter and 29.4% for 15000 meter. One way to try to circumvent the bandwidth fragmentation is to change the sizes of the CDPs and the cycle times.

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