BENTLY 330103-00-03-05-02-05 Monitor cable

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.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 Exchange of a single CI522 on page 196 and Exchange of a redundant CI522 on page 196.

Removing a CI522 

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.

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. CI522 Status Information The status information of the own communication interface, CI522, is available with the DB element Advant Fieldbus 100. The status of the CI522 is given by the DIAG_I terminal in the Advant Fieldbus 100 bus DB element. T

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