CTI 2500-C100, Инструкция по установке и эксплуатации

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CTI 2500 Installation and Operation Guide V2.8 40
assumes the standby role, responding to status requests from the 2500 Series controller, but
not accessing the base I/O.
When a dual RBC configuration is detected, the 2500 Series controller continuously monitors
the status of the status of both RBCs. If a problem is detected with the standby RBC, the 2500
Series controller will disable it. Should the controller detect a problem with the active RBC while
the standby RBC is operational, it will direct the standby RBC to assume the role of active RBC
and disable the previously active RBC.
The standby RBC, if operational, also monitors the condition of the active RBC. If the standby
RBC detects a problem with the active RBC it will automatically assume the role of the active
RBC and will disable the previously active RBC. RBC status is reported in STW168.
An RBC that has been disabled can be re-enabled by temporarily changing the address switch
to a different address then changing it back to the original address. Alternately, the RBC can be
re-enabled by cycling power to the base.
Using your programming software, you can manually direct the RBCs to swap roles (if the
standby RBC is operational). This capability is especially useful when executing diagnostic
routines on an RBC, since diagnostic routines are always run on the standby RBC in dual RBC
configurations.
RS-485 cabling to the dual remote base controllers must comply with the cabling and topology
standards described in section 4.2.3. See
Other Topology Considerations within this section for
typical dual RBC connections.
NOTE:
You can use either a CTI 2500-RIO-A (firmware version 7.03 or higher) or a Siemens 505-6851-B remote
base controllers in a dual RBC configuration; however, you cannot intermix CTI and Siemens RBCs in
the same base.