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.

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Honeywell SMV 3000 user manual About Database Broadcast