122 GE INFORMATION D400 SUBSTATION GATEWAY INSTRUCTION MANUAL
CHAPTER 10: INTRODUCING THE D400 CONFIGURATION
D400 system redundancy
The D400 redundancy solution uses two D400s connected through serial and/or network
links - one in active mode and one in standby mode. If the active unit fails, the standby unit
becomes active and takes over system operation.
Three redundancy modes are available:
• Warm Standby redundancy.
Two D400 units are connected using a RS-232 switch panel and a single dedicated
serial link. Data synchronization is minimal, restricted to field Accumulator points,
local command quality, and configurations. See the D400 online help Data
Synchronization book > Warm Standby topic.
• Hot Standby redundancy.
Two D400 units are connected using network and optional primary and backup serial
links. In Hot standby redundancy, two D400 units are kept in constant synchronization
with respect to their real time databases. Connection to an RS-232 switch panel is
optional.
• No redundancy (Default)
D400 system (Warm and Hot Standby) redundancy is configured and enabled through
several software applications that run on each redundant D400 unit. Hardware
configuration` is required; refer to the D400 online help D400 Redundancy Manager
book.
D400 system utilities
Configuration information related to the D400 system is changed using utility programs
that are installed on the D400 platform. You can access these system utilities directly at the
D400#>> command prompt through the local maintenance port or remotely through the
Utilities Power bar button in the D400 HMI.
The D400 system utilities are typically used during the initial setup of the D400 and for
changing the basic configuration of the system, including the network connections,
system date and time, and administrator passwords.
For more information on using the D400 System Utilities, see the Miscellaneous Utilities
book in the D400 online Help.
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