INTRODUCTION
I-E96-607A
E - 1
APPENDIX E - INIIR01 REDUNDANT CONFIGURATIONS
INTRODUCTION
This section provides information on various ways to terminate
a redundant INIIR01 INFI-NET to INFI-NET Remote Interface.
Redundant interfaces provide an additional level of operational
security against module or communication system component
failure.
REDUNDANT CONFIGURATIONS
Redundant INIIT02 INFI-NET to INFI-NET Transfer Modules
must share a common Controlway or module bus. The transfer
modules use Controlway for redundancy communication and
for transfer of the executive block (function code 202) configu-
ration between the primary and secondary INIIT02 module.
An I/O expander bus connection must exist between each
INIIT02 module and its associated network interface slave (NIS)
module. Do not connect the I/O expander bus between the pri-
mary and secondary INIIT02 module. Keep each I/O expander
bus as short as possible.
Switch Settings for Redundancy
To enable redundancy, dipswitch SW3 pole seven must be set
to one on both INIIT02 modules. Executive block specification
S17 and the serial port configuration determine what condi-
tions will lead to a failover from primary to secondary INIIT02
module. If the primary module stops executing for any reason,
the backup INIIT02 module will attempt to come on-line.
The INIIT02 module supports external equipment switching on
failover. This feature requires redundant digital I/O modules
and associated termination unit or module. The setting of
dipswitch SW4 pole three on the INIIT02 module (and specifi-
cation S17 of function code 202) determines the initial or final
state of digital I/O module output number three. In redundant
applications, dipswitch SW4 pole three on the primary INIIT02
module enables the primary transceiver while the primary
INIIT02 module is on-line. Setting the same switch to the oppo-
site position on the secondary INIIT02 module enables the sec-
ondary 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 INIIT02 module to connect the antenna to the primary
