The TC516 modem has two connections, one for each redundant CI522 and a connection to one twisted pair bus cable. TC516 can be used for two redundant CI522s as well as for one single CI520V1/CI522/CI526V1. If communication interface redundancy is used, set the DB-element for double time-out. See Double CDP Time-out on page 88. Communication Interface Redundancy in Advant Controller 160 For configurations with one Advant Fieldbus 100, the communication interface CI630/CI631 must be placed at position 2 (non redundant interface) or in position 1 and 2 (redundant interface) in the Basic Station. A second and third Advant Fieldbus 100 can be used with AC 160. These can use single or redundant communication interfaces. The communication interfaces can be placed at position 9 and 10, or 11 and 12, and so on.
S800 I/O Field Communication Interface Redundancy
The redundancy in the S800 I/O Stations is achieved with redundant Field Communication Interfaces (FCIs) connected to a media redundant Advant Fieldbus 100. In the S800 I/O station, redundancy is achieved with redundant S800 communication interfaces sharing the same I/O modules. This redundancy follows the same principles as the communication interface redundancy in the Advant Controller 400 Series The communication interface redundancy in AC 800M is achieved by using two CI869 modules that are connected to the same AC 800M controller. One of the CI869 modules is configured as primary, while the other is configured as backup.
Failover time for CI869 and Double DSP timeout
The failover time is the time that the backup CI869 takes to function as primary without error, if the primary CI869 does not work properly. The other stations on the AF 100 bus do not influence the failover of the CI869 modules. The backup CI869 is supervising that the primary CI869 is sending its CDPs with the expected cycle time. If the backup CI869 detects that the Primary CI869 does not send its CDPs as it should, it triggers the AC 800M controller to perform a failover of CI869. The ‘Double DSP timeout’ parameter must be enabled for an AF 100 station that is receiving DSP data from another AF 100 station that uses redundant communication interfaces. For details, refer to the Online Help of Control Builder.
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