VMIVME-7750-746000 Gas turbine electrical module

　The rest of the time slots may be used freely for CDP communication. The practical maximum bus load value depends on the configuration. This is dependent on the combination of very fast CDPs (for example 1-2 ms) with very slow ones (that is 2048 and 4096 ms). As soon as one CDP with cycle time 2048 ms is used the time slot table is made wider but lower, see Figure 33. For 4096 ms the width is even more increased and height decreased. The following rules must be observed when configuring the Advant Fieldbus 100: • The bus load (calculated as in Section , Configuration of Advant Fieldbus 100) caused by CDPs having a cycle time of 1 ms must be less than or equal to 50% in total. • The maximum bus load on 2000m bus length (calculated as in Section , Configuration of Advant Fieldbus 100) is 70%. For 8500m and 15000m the maximum bus load is 50% (calculated according to Section , Configuration of Advant Fieldbus 100 and Section , Configuration of Advant Fieldbus 100.

Message Transfer Rates 

  As message transfer is event driven (and thus non-deterministic), it is difficult to specify transfer rates. It is, however, possible to specify the maximum throughput in a system where all the band-width available for process data has been used. In such a system, no more than about 100 kbits per second can be employed for message transfer. Note that this transfer rate includes protocol information in the packets and acknowledgments which carry no message data. The net user data transfer rate will thus be somewhat less. Time tagged events by means of EventSet are sent as Message Transfer. Unless any other Message Transfer messages are performed Advant Fieldbus 100 can handle ten events per second.

Station Supervision

  Station Supervision in the Advant Controller 400 Master In the Advant Controller 400 Series it is possible to supervise stations on the bus. For this purpose three station data base elements can be used, the AF 100 Station (in DB elements denominated AF100S), the Advant Controller 110 (in DB elements denominated AC110) and the Advant Controller 70 (in DB elements denominated AC70). The three different data base elements are described below The AF100S DB element is used for supervision of other stations connected to the bus. It is a general DB element for AF 100 Stations The Advant Controller 110 Station DB element is a special case of the AF 100 Station which is used when the station is an Advant Controller 110.

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