Falcon Lead Lag Appendix E
E-68
MODBUS REGISTERS
Bolded registers are typical boiler/burner status monitoring points.
Highlighted registers are allowed Modbus read/write points.
Hex Decimal Parameter R/W Format Description
CONTROLLER STATUS
0002 0002 Digital I/O R U16 Bit map:
15=Safety relay
14=Time of Day
13=STAT (Demand)
12=High Fire Switch (HFS)
11=Low Fire Switch (LFS)
10=Load Control Input(LCI)
9=Pre-ignition interlock (PII)
8=Interlock (ILK)
7=Alarm
6=Main valve (ignored on DBI burner)
5=Pilot valve (Main fuel valve on DBI burner)
4=Ignition
3=Blower motor
2=Pump C
1=Pump B
0=Pump A
0003 0003 Annunciation I/O R U16 Only applicable when Annunciation is enabled Bit map: 15-14=Reserved
(always 0) 13=STAT2 12-8=Reserved (always 0)
7=Annunciator 8 - Propane (LP) gas (dual fuel burner)
6=Annunciator 7 - Natural Gas (dual fuel burner)
5=Annunciator 6 - Low Gas Pressure
4=Annunciator 5 - High Gas Pressure
3=Annunciator 4 - High Air Pressure
2=Annunciator 3 - Auxiliary Low Water
1=Annunciator 2 - Low Water
0=Annunciator 1 - Interrupted Air Switch
TREND STATUS
0006 0006 Demand source R U16 Current demand source: 0=Unknown, 1=No source demand, 2=CH,
3=DHW, 4=Lead Lag slave, 5=Lead Lag master, 6=CH frost protection,
7=DHW frost protection, 8=No demand due to burner switch (register
199) turned off, 9=DHW storage, 10=Mix
0007 0007 Outlet Limit channel R U16 -40°-130° (0.1°C precision)
0008 0008 Firing rate R U16 Actual firing rate (% or RPM).
0009 0009 Fan speed R U16 RPM
000A 0010 Flame signal R U16 0.01V or 0.01?A precision (0.00-50.00V)
000B 0011 Inlet channel R U16 -40°-130° (0.1°C precision)
000C 0012 DHW Limit channel R U16 -40°-130° (0.1°C precision)
000D 0013 Outdoor channel R U16 -40°-130° (0.1°C precision)
000E 0014 Stack Limit channel R U16 -40°-130° (0.1°C precision)
000F 0015 Header channel R U16 -40°-130° (0.1°C precision)
0010 0016 Active CH setpoint R U16 -40°-130° (0.1°C precision) Setpoint determined by CH setpoint source
(register 65).
0011 0017 Active DHW setpoint R U16 -40°-130° (0.1°C precision) Setpoint determined by DHW setpoint source
(register 81).
0013 0019 Register Access Status R U16 Register data write access status:
0=No register writes allowed,
1=Installer register writes allowed,
2=OEM register writes allowed.
3=All register writes allowed.
0015 0021 Analog remote input R U16 0=No signal, 4-20 mA (0.1 mA precision)
BURNER CONTROL STATUS
0020 0032 Burner control status R U16 0=Disabled, 1=Locked out, 2-3=Reserved, 4=Anti-short cycle,
5=Unconfigured safety data, 6-33=Reserved, 34=Standby Hold,
35=Standby Delay, 36-47=Reserved, 48=Normal Standby, 49=Prepar-
ing, 50=Firing, 51=Postpurge, 52-65535=Reserved
0=Disabled
1=Locked out
4=Anti-short cycle
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