Reference Manual
748384-C
September 2003
1-32 Introduction
Rosemount Analytical Inc. A Division of Emerson Process Management
NGA2000 Reference
1-17 ANALYZER STATUS
There are several kinds of status information
reported by the analyzers. These include its
alarm status, its operational status and its sam-
pling status, its calibration activity and the valid-
ity of its output reading .
These are all reported over the network in the
form of variables, and they are shown in various
places in the menu structure.
a.
Health (Alarm Status)
The analyzer continuously monitors the
state of a whole series of internal parame-
ters. It also monitors its operational pa-
rameters such as pressures and flows. The
operational parameters may be assigned
upper and lower limits, while the internal pa-
rameters have such limits fixed by the pro-
gramming.
If a limit is exceeded, an alarm flag is set,
and the alarm status variable is set to a
level corresponding to the severity of the
parameter. Most parameters cause a
WARNING state to be set, but the internal
parameters may cause a FAILURE state to
be set. If any of the parameters is outside
its Emits, this state will be set.
If you have allowed it to (by enabling alarm
reporting in the technical setup section), a
message will be displayed on the screen as
well.
Otherwise you can show the alarm state by
selecting "Health" to be reported in the aux-
iliary line selection under
Expert controls
and setup
You can set an I/O module to report this by
setting up its alarm parameters to report the
analyzer alarm state in the
Auxiliary module
setup
under
Expert controls and setup
Network variables: GENERALSTATE
b.
Analyzer Operational Status
The analyzer may be in normal mode, in
standby (meaning that it has not warmed up
yet, or otherwise cannot take readings), or
is in calibration. This state may also be re-
ported in the auxiliary lines, and by the I/O
module.
Network variables: OPSTATUS
c.
Analyzer Sampling Status
An I/O module that controls the sample
flow, such as an Autocal module or a sam-
ple stream selection module can tell the
analyzer that it is not looking at the sample.
This can also be reported like the other vari-
ables.
Network variables: PROCESS
d.
Analyzer Calibration Activity
The analyzer reports when it is in the proc-
ess of performing a zero or span. This is
shown on the zero and span screens to tell
you what it is currently doing. This informa-
tion is also reported to an Autocal module
as feedback so that the latter can tell when
to go onto the next step.
Network variables: CALSTAT
e.
Analyzer Calibration Status
The analyzer reports the status of its last
calibration, together with its time and other
data. This may be found on the "Results"
menu under
Expert controls
, under
Expert
controls and setup
Network variables: CAL_ERR_MSG,
CAL_RAWSIG, CAL_VALIDITY, CAL-
DATE_Z, CALDATE_S
