FuelsManager Defense
26 Administrator Manual
the server is established so that all changes to the system shared resources are
updated on the local computer. If the local computer is the master system server,
additional functions are used to transmit changes to all Client computers.
Maintaining local disk images of shared resources ensures that a viable image of
all shared resources is available even if the designated server is temporarily
unavailable. Any changes to shared resources are automatically updated to local
storage when the server is available.
DataManager
The FMDataManager service maintains real-time process data and provides
highly efficient, event-driven communications with other FuelsManager programs
for data acquisition.
DataManager functions
• Provides security functions to limit user interaction with the database based
on Windows 2000/XP and FuelsManager Configuration Accounts
• Provides the means to create and modify the system database
• Updates data values upon requests from the FMCommManager or the user
interface programs
• Performs functions to detect and report alarms and events related to changes
in the database
• Performs database calculations based on changes to the database.
• Performs Server functions to provide process data upon request from the
user interface programs and FMCommManager. Real-time data can be
provided to other FuelsManager or third party programs using industry
standard protocols
Database storage
Process data is stored in a real-time data array. Each real-time data value entry
includes the current value, time stamp, and status. Each process data item is
associated with a point and each point within the database is assigned a unique
name of up to four fields.
Database time
For data received from an FMCommManager, the time stamp is established when
data is received from the field device. For values calculated in the database, the
database time stamp is based on the latest calculation. The format is expressed in
seconds and milliseconds and is stored in Greenwich Mean Time. This time is
available for assignments in graphics and reports and is also viewed in the
Operate program. All displays and reports correct to local time.
CommManager
This program controls communications with all field instrumentation and provides
updated process data to the FMDataManager. The CommManager acquires data
from remote devices and communicates this data to FMDataManager. The
CommManager also loads, initializes, and supervises individual device interface
modules.
CommManager Functions
• Allocates hardware ports to devices based on system configuration
• Loads and manages interfaces based on configured field devices
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