Emerson Process Management 3422 Benutzerhandbuch
230
GC data validity
Section 6: Meter operation
Reference, Installation, and Operations Manual
June 2013
3-9000-743 Rev S
6.5.5
GC data validity
The GC-read gas property data validity is indicated by the
AreGasPropertiesInvalidGC data
is true. These
conditions are indicated by the Daniel MeterLink
Monitor
page
Field I/O
indicator.
6.5.6
GC alarm handling
The following data points are included in the meter’s alarm log (
Are-
GasPropertiesInvalidGC, IsGCAlarmPresent, IsGCCommErr, GCCommStatus, and
IsGCDataErr.
19
GC response message (RTU protocol) incomplete.
20
GC gas property data spans more than one update.
Table 6-17 GC-read gas property invalid conditions
Indication
Data Point
Data Point
Condition
IsGCAlarmPresent
Invalid or expired GC feature key (
).
Option Board Port C is not available (Option Board probably disconnected).
Option Board Port C improperly configured (such as if configured without using the Daniel
MeterLink Field Setup Wizard).
MeterLink Field Setup Wizard).
Unrecognized gas component ID.
Specified gas stream (
GCStreamNumber
) not found within the specified period (
GCDe-
siredStreamTimeout
).
GC reported alarm (GC Alarm1 bits 14 and/or 15 set, GC Alarm2 bits 0, 1, 2, and/or 3 set).
IsGCWarningPresent
Not presently used - reserved for future use.
IsGCCommErr
Refer to communication error conditions listed in
.
IsGCDataErr
The total unnormalized gas composition mole percentage is not within [85%, 115%].
An individual gas composition mole percentage is not within [0%, 100%].
The specific gravity is not within [0.2, 0.8].
The heating value is greater than 50 kJ/dm
3
.
Table 6-16 GC Communication status list
GCComm status value
Error description