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software users. These privileges include being able to instantiate applications and
make changes to the functionality of the NGC.
A second level of user access includes application editing and downloading files to
a device. User access by default is restricted from modifying and downloading the
application table or from downloading files to the device’s TFData and TFCold
drives but has all other user-type privileges.
These default privileges can be edited by the administrator and consist of a user
name (up to 25 alphanumeric digits) and a password (up to 25 alphanumeric
digits). These are separate privileges that may be given individually or totally. See
the help files in the host software package for more information.
The NGC does not send an error message when the user
tries to write an operation but does not have the proper
hardware security code; it simply does not accept value
changes.
4.8 Alarm Definitions
The user has the ability to define the threshold for the NGC alarm parameters.
The NGC provides 124 standard alarms. Of these, a number of alarms are
defaulted to enabled (see
). Many of these are considered system
alarms, and the user is cautioned not to make changes to the logic. A multitude of
additional alarms are available and user-configurable.
The user may define alarms, beyond defaults, for each
process stream.
Table 4–3 Defaulted Alarm Definitions
Alarm Descriptions
Logic Type
Threshold
Default
Severity
Pressure Regulator 1
GT
0
Fault
Pressure Regulator 2
GT
0
Fault
Sample Pressure
GT
0
Fault
Oven Temperature Error
GT
0
System Fault
No Stream Valve Selected
GT
0
System Fault
Digital-Analog Bd Comm Error
GT
0
System Fault
Calculation Error
GT
0
Fault
Calibration Un-Normalized Total
GT
0
Fault
Stream Sequence Error
GT
0
Fault
Calibration CV Percent Error
GT
0
Fault
RF Pct Error
GT
0
Fault
Analog Bd Ambient Temp
GT
0
Warning
Analog Power Supply
GT
0
Warning
Out of Carrier Gas (DI1)
LT
1
System Fault
Out of Cal Gas (DI2)
LT
1
System Fault
GCM Chrom Process
GT
0
System Fault
Bad Bead
GT
0
Fault
Sample Flow Detect
GT
0
Fault
Cpu Loading
GT
85
Warning