Modbus Map For Legacy Flare.iq Gen 1 Installations - Panametrics flare.IQ Generation 2 Operation And Maintenance Manual

APPENDIX A:

Modbus map for legacy flare.IQ Gen 1 installations

flare.IQ Gen 2 is designed to be backward compatible
with Gen 1 installations for flare control applications
(digital meter verification feature is not available in
Gen 1). For those customers that wish to continue to use
their existing DCS configuration for flare control, the
Gen 2 system supports the Modbus map of unsigned
integers shown in table 11 (analog inputs) and
Table 11: Modbus address list for flare.IQ Gen 1 legacy customers (analog inputs for flare control)
Register
Register tag name
address
AR 10
CO2 11
CO 12
H2 13
N2 14
O2 15
H2O 16
MW_INPUT 20
NHVVG_INPUT 21
QFUEL_TC 30
QFLARE_TC 40
TFLARE_TC 41
PFLARE_TC 42
CFLARE_TC 43
QSTEAM_TC 50
TSTEAM_TC 51
PSTEAM_TC 52
QAIR_TC 60
TAIR_TC 61
Number of
Description
registers
1 Argon concentration, fraction (0.0 to 1.0)
1 Carbon dioxide concentration, fraction (0.0 to 1.0)
1 Carbon monoxide concentration, fraction (0.0 to 1.0)
1 Hydrogen concentration, fraction (0.0 to 1.0)
1 Nitrogen concentration, fraction (0.0 to 1.0)
1 Oxygen concentration, fraction (0.0 to 1.0)
1 Water vapor concentration, fraction (0.0 to 1.0)
1 Molecular weight from GC/MS, g/mol
1 Net heating value of vent (flare) gas, BTU/SCF
1 Fuel gas flow rate, SCFH
1 Flare flow rate, SCFH
1 Flare temperature, degrees Fahrenheit
1 Flare pressure, PSIa
1 Flare sound speed, ft/s
1 Steam flow rate, PPH
1 Steam temperature, degrees Fahrenheit (future use)
1 Steam pressure, PSIg (future use)
1 Air flow rate, CFM
1 Assist air temperature, degrees Fahrenheit
table 12 (analog outputs). Since all analog values sent
and received must be integers, these values have to be
scaled appropriately as described in section A.1 to maintain
the desired range and accuracy. The "scaling" column
in the table below shows the scaling factor to multiple
or divide a value by before sending or after receiving
(/ = divide, * = multiply) on DCS master.
Scaling
factor
*10
*10
*10
*10
*10
*10
*10
*100
*10
/10
/100
*10
*100
*10
/10
*10
*100
/10
*10
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