41
BE 57-660 Eclipse Model 700 Guided Wave Radar Transmitter
In essence, this approach ensures that the right diagnostic
information is available to the right person-at the right
time. In addition, it allows diagnostics to be applied, as
most appropriate, for a particular plant application (such as
process control engineering or asset management mainte-
nance). Customer specific mapping of diagnostics to these
categories allows for flexible configuration depending on the
user's requirements.
From an external Model 700 transmitter perspective, diag-
nostic information includes measurement of process condi-
tions, in addition to detection of internal device or system
anomalies.
As mentioned above, the indicators can be assignable (via
the DTM or host system) by the user to any (or none) of
the NAMUR recommended Status Signal categories:
Failure, Function Check, Out of Specification, and
Maintenance Required.
Diagnostic indicators can be mapped to multiple categories,
an example is shown in the diagram at left.
In this example, “Calibration Required” is mapped to both
the Out of Specification and Maintenance Required status
signals, and the diagnostic indicator named “High
Temperature” is mapped to none of the signals.
Indicators that are mapped to the Failure category will nor-
mally result in a current loop alarm output. The alarm state
for HART transmitters is configurable as high (22 mA),
Low (3.6 mA), or Hold (last value).
Users will not have the ability to unassign certain indicators
from the Failure signal category as the Model 700 user
interfaces will prohibit or reject such re-assignment entries).
This is to ensure that current loop alarms are asserted in situ-
ations where the device is not able to provide measurements
due to critical failures. (For example, if the alarm selection
has not been set to Hold, or a fixed current mode is in
effect.)
A default mapping of all diagnostic indicators will be applied
initially, and can be re-applied through use of a reset function.
Failure
Analog Output Error
Echo Lost
High
Temperature
Dry
Probe
Calibration
Required
Function
Check
Out of
Specification
Maintenance
Required
NE-107
Status Signals
Diagnostic Indicators
