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INTRODUCTION
I-E96-613A
E - 1
APPENDIX E - REDUNDANT CONFIGURATIONS
INTRODUCTION
This section provides information on various ways to terminate
redundant INIPR01 INFI-NET to Plant Loop Remote Interfaces.
Redundant interfaces provide an additional level of operational
security against module or communication system component
failure.
REDUNDANT CONFIGURATIONS
Redundant INIPT02 INFI-NET to Plant Loop Transfer Modules
(IPT) must share a common Controlway or Module Bus. The
IPT modules use Controlway for redundancy communication
and for transfer of the executive block (function code 203) con-
figuration between the primary and secondary IPT module.
An I/O expander bus connection must exist between each IPT
module and its associated INNIS01 Network Interface Slave
(NIS) Module. Do not connect the I/O expander bus between
the primary and secondary IPT module. Keep each I/O
expander bus as short as possible.
Switch Settings for Redundancy
To enable redundancy, dipswitch SW4 pole seven must be set
to one on both IPT modules. IPT executive block specifications
and the serial port configuration determine what conditions
will lead to a failover from primary IPT module to secondary IPT
module. If the primary IPT module stops executing for any rea-
son, the backup IPT module will attempt to come on-line.
The IPT module supports external equipment switching on fail-
over. This feature requires redundant digital I/O modules and
associated termination device. IPT executive block specifica-
tions determine the state of digital output number three. In
redundant configurations, the primary IPT module (using digi-
tal output three) enables the primary transceiver while the pri-
mary IPT module is on-line. Insure the executive block of the
secondary IPT module is identically configured so it will enable
the secondary transceiver if a failover occurs.
Redundant Hardware Configuration Example
Figure
shows a block diagram of a configuration using
redundant transceivers. The connections shown allow the pri-
mary IPT module to connect the antenna to the primary trans-
ceiver. If failover occurs, the secondary IPT module connects