CHAPTER 9: ABOUT THE D400 APPLICATIONS
D400 SUBSTATION GATEWAY INSTRUCTION MANUAL GE INFORMATION 115
Server application
This type of application typically allows the D400 to communicate with a master station or
host computer over a communications channel. The server application reads input point
values from the real-time database and sends control requests to it. Known previously
within GE embedded devices as a Data Presentation Application (DPA).
Automation application
This type of application manipulates data within the real-time database. The automation
application has the ability to examine the status and values of input points in the real-time
database and accept control requests from server applications or other automation
applications. The automation application is able to process this data and then update the
values of the input points owned by the automation application or output points belonging
to another application. Known previously within GE embedded devices as a Data
Translation Application (DTA).
System point database
Information collected by the D400 is stored in a central database on the D400 called the
System Point Database. The database is a SQL Server database and includes all types of
system information, including communication statistics, present values, peak values and
event records. The real-time database is dynamically updated for all the D400 system
inputs/outputs as substation events take place and information is exchanged between
applications.
Figure 2 illustrates a simplified relationship between the three application types and the
system point database within the D400.
Figure 55: Data applications within the D400
Device(s)
Server
Application
(DPA)
Client
Application
(DCA)
System Point
Database
Automation
Application
(DTA)
Master
Station
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