Emerson Daniel 3410 Series Operation Manual page 73

Operations manual
DAN-20057316
Table 5-13: Supported Components IDs
Component IDs
C6PLUS_COMP_ID_2 (109)
Note
Components read from the register 3001-3016 had 100 subtracted from them by the GC.
The Daniel Gas Ultrasonic Meter must add 100 to each ID read from the GC before looking
it up in this table.
Gas property data
The gas property data read from the GC includes gas composition, heating value, and
specific gravity (relative density).
The gas composition includes the 21 standard components plus C6+ and Neopentane (see
Table 5-9
information on how the GC-read gas properties are mapped to the 'in-use' gas property
data points.
The GC-read heating value and specific gravity are stored in the HeatingValueGC and
SpecificGravityGC data points, respectively.
Data polling
The meter periodically polls the GC looking for data updates. If the meter is
communicating normally with the GC, then it polls the GC every one minute looking for an
update (i.e., a change in the GC analysis time). Otherwise, the meter polls the GC every 15
seconds.
When the meter determines that a GC update is available for the specified stream number,
it then reads the GC data using multiple reads one second apart until all the data is read.
The GC analysis time is read again at the end of the data collection to determine if another
update occurred during the data collection (i.e., the data is not all from the same update).
If so, the meter discards the gas property data just read and begins looking immediately
for the next update.
If the meter cannot successfully communicate with the GC after four consecutive polls (15
seconds apart), then the meter indicates the communication alarm via the IsGCComErr
data point with the GCCommStatus data point indicating an error code (listed in
5-14
Table 5-14: GC Communications status list
GCComm status value
0
1
2
3
4
Model 3418 GUSM
for a list of data point names). Refer to
below).
(continued)
In-Use gas property data
Error description
No error.
Desired stream not found.
GC controller is busy (error defined by Modbus protocol).
GC detected an illegal Modbus function code from the meter.
GC detected an illegal Modbus data address from the meter.
Configurations
January 2019
for further
Table
73