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UNS4881b,V4 3BHE009949R0004 Excitation control module

When the communication interface is to be permanently removed, all sending DSPs must be deleted or redefined. All stations on the bus must be updated by deleting the corresponding receiving DSPs as these will not be updated. A receiving DSP, configured on the CI522 module to be removed, does not have to be removed from any other station if there is other receiving DSPs with the same identity. If no other station has a receiving DSP, the sending DSP should be deleted from its station as the DSP will be obsolete. The consequence of not removing the DSPs in question is that the other communication interfaces will keep the CDPs in the scan tables and by this occupying bus bandwidth for no use. As a sending CDP must be deleted from the station by which it is configured, the CDP signal address can not be used by any other station unless the whole bus is restarted. Another drawback of not removing receiving DSPs in other stations is that they will not be updated when the sending DSP or its communication interface has been removed. Replacing the communication interface with another CI522 communication interface, see Section 4.6.8, Exchange of a single CI522 and Section 4.6.9, Exchange of a redundant CI522. When the sending DSPs have been deleted, perform the following steps in removing the CI522 module: • Reset the IMPL terminal on the CI522 data base element. • Remove the modem cable from the CI522 module. • Remove the CI522 module. The remaining communication interfaces will automatically continue to share the bus master responsibilities between them and ignore the removed station.

Setting the CI522 Operational

 When the CI522 is started and configured, it must be set operational in order to enable communication on the Advant Fieldbus 100, and to participate in the sharing of the bus master responsibilities. This is done automatically by the Advant Controller 400 Series. If the CI522 is the first communication interface to become operational, it immediately assumes the bus master responsibilities. If another communication interface becomes bus master before the CI522, the CI522 will detect the presence of a bus master on the Advant Fieldbus 100 and work to get synchronized. If a CI522 is commanded operational on a bus where other communication interfaces already shares the bus master responsibilities, the CI522 sends a message to the current master to notify its presence. The current bus master then sends the scan table and the current bus length to the CI522 while carrying out the bus master responsibilities. The CI522 adds its own CDPs to the scan table and then asks to become the current bus master. After receiving the bus mastership the new updated scan table is distributed to all other bus administrators. If a CI522 gets its configuration changed on-line due to changes in the database. The CI522 updates its own scan table and then asks to become bus master. When it has become bus master the scan table is distributed to all other bus administrators. If there is another station (that is bus administrator) on the bus that is configured with a different logical length the CI522 will become operational for a short moment and then leave the operational state. This happen since the bus length currently configured for the bus is distributed to the CI522 by the busmaster and compared with the CI522’s own configuration parameters, if they are equal the CI522 remains operational, but if they deviate the CI522 leaves the operational state and turns off all diodes on the front of the board