BENTLY 1900/55 1900/55-0Z-01-01-01 Monitor framework

For information about replacing the CI520 communication interface with another CI520 communication interface, see Exchange of a CI520 on page 195. When the sending DSPs have been deleted, perform the following steps in removing the CI520 module: • Reset the IMPL terminal on the CI520 data base element. • Remove the modem cable from the CI520 module. • Remove the CI520 module. The remaining communication interfaces automatically continue to share the bus master responsibilities between them and ignore the removed station.When the CI522 is started and configured, it must be set operational 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.

CI520 Status Information 

The status information of the own communication interface, CI520, is available with the DB element Advant Fieldbus 100. The status of the CI520 is given by the DIAG_I terminal in the Advant Fieldbus 100 DB element. The following status information is given on the DIAG_I terminal: OK CI520 is operating. IE Missing or faulty CI520. PE Process error, for example cable break. ME CI520 internal error, replace CI520. SE System error, for example several stations are time master. DC Diagnostics has changed. PSV The CI520 is passive. DPL The CI520 only has default parameters. I9 - I15 Not yet defined.

If another communication interface 

becomes bus master before the CI522, the CI522 detects the presence of a bus master on the Advant Fieldbus 100 and gets synchronized. If a CI522 is commanded operational on a bus where other communication interfaces already share 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.

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