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SMV 3000 Transmitter User’s Manual 1/99156
A.3 Data Exchange Functions, Continued
About Database
Broadcast
Table A-2 lists the maximum database size and transmission time for the
SMV 3000. The actual time may be less, if less options are configured.
See Section 3 in the PM/APM Smartline Transmitter Integration Manual
for other DE protocol data. Remember that transmitters only broadcast
bytes of their database in the DE 6-byte format. Note that the absolute
maximum time for any Smartline transmitter to broadcast its database is
94 seconds.
Table A-2 Typical SMV 3000 Database Size and Broadcast Time
Transmitter Type Database (Bytes) Time (Seconds)
SMV 3000
202 74
About BAD Database
Protection
It is possible to get an undetected database mismatch for PV4 algorithm
configuration parameters that are not mapped to the IOP. This means the
potential exists for the control loop to use a bad database that will not be
flagged by a bad PV signal.
The PV4 algorithm parameters must be configured through the SCT 3000
and are not mapped to the IOP. Thus, it would be possible to replace a
transmitter that is operating with the ideal gas volume flow equation with
one configured for the ideal gas mass flow equation without causing a bad
PV indication but resulting in different PV4 data. See subsection A.5 for
additional information about configuring the SMV and TDC.
The calculation of PV4 is also based on equation compensation, units,
pressure, temperature, and scaling factor entries that must be configured
through the SCT 3000 and are not mapped to the IOP. The scaling factor
value could be changed without causing a bad PV indication but resulting
in a different PV4 rate of flow calculation.
Note that full database protection is provided for the other SMV 3000
transmitter PVs, since their configuration parameters are mapped to the
IOP.