HONEYWELL 90088-A-9001 Output module

Message Transfer Message transfer is a point-to-point communication and is sent on request from one station to another station on the AF 100 bus. Message transfer is used for the transfer of identification data, configuration data, and events between stations on the bus.As long as the communication interfaces that are attached to the Advant Fieldbus 100 are operational, the bus master function ensures that the process data flows on the bus and that the message transfer is possible. To ensure a high data availability on the bus, the bus administrators should have as low station address as possible. Each bus administrator supervises that it obtains the master frames on the bus every millisecond. If it does not obtain the master frames for (8 + 2 * own station address) milliseconds, the bus administrator becomes the bus master.

Bus Master Function

Both process data and message transfer requires an active bus master. The bus master function controls all the transmission on the Advant Fieldbus 100, while reception of data is controlled locally on the individual communication interface. In an Advant Fieldbus 100 network with one or more communication interfaces, one of these functions as bus master while the other communication interfaces are active with supervising that the bus master operates correctly. The bus master responsibility is passed over to the next communication interface on the bus approximately every second (for more information, see Synchronization on page 85). All the attached communication interfaces with bus administration function share the bus master responsibilities.

Network Configuration 

When a new Advant Controller and/or AF 100 Station is connected to the Advant Fieldbus 100, it is automatically recognized and the new element participates in the communication as it is configured. In the Advant Controller 400 Series, the supervision of desired remote stations must be configured. The starting, stopping, and restarting of stations can also be done without disturbing the traffic on the Advant Fieldbus 100, if some precautions are taken (see Chapter 4, Installation and Start-up). However, the communication interfaces of Bus Administrator must know the configuration of all sending CDPs in the network in order to perform the bus master function. Therefore, the information must be distributed to all AF 100 nodes with bus master capabilities when there is any change in the configuration of sending CDPs.

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