GE 04220FL11232A Gas turbine system relay

GE 04220FL11232A Gas turbine system relay

Communication Interface Redundancy Communication interface redundancy is achieved by using a pair of CI522s, CI630s, CI631s, CI869s or CI820s, connected to a media redundant bus. Communication interface redundancy is available for Advant Controller 400 Series, Advant Controller 160, AC 800M controller, and S800 I/O stations. Two communication interfaces (CIs) can operate as a pair, where one is Primary and the other is Backup in the controller configuration. 

Functions of Primary CI

 In a redundant configuration, the address of the primary CI is the configured station address on the bus. The primary CI: • Sends all output CDPs. • Receives all input CDPs. • Sends the time synchronization message if the station is configured as time synchronization master. • Handles the normal Service Data communication for the station. • Supervises that the backup can send on the bus. This is done at a low frequency using the service data protocol. • Must be configured as bus master if the module is CI522/CI630 or CI631, so that the bus master responsibilities are performed.

In a redundant configuration

 the address of the backup CI on the bus is the configured station address + 80. The backup CI: • Supervises that the primary CI sends its output CDPs properly. • Sends signal to the controller if the primary CI does not send its output CDPs. • Receives all input CDPs. • Responds to Service Data communication with the Primary. • Must be configured as bus master if the module is CI522, CI630 or CI631. If the station number is less than or equal to 47, the backup module performs the bus master responsibilities, otherwise it does not.Communication Interface Redundancy in Advant Controller 400 Series To connect the CI522 redundant communication interfaces to a twisted pair bus, two TC516 modems (or four TC512 modems) are used. See Figure 2. To connect the CI522 redundant communication interfaces to a coaxial cable bus, four TC625 modems are required.

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