Modbus/Bacnet Memory Map - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual

7.F

Modbus/BACnet Memory Map

Modbus
Address R/W
0 Read Inlet sensor
1 Read Outlet sensor
3 Read DHW sensor
4 Read System Inlet Sensor
5 Read System Outlet Sensor
6 Read Outdoor Sensor
7 Read Flue Sensor
12 Read Flame Signal 1
14 Read 0-10VDC (4-20mA) Input for BMS
18 Read Safety Chain Status
19 Read Non-safety Chain Status
20 Read Demand source
21 Read Digital Output Status
22 Read Gas and Pilot Valve Status
23 Read 0-10VDC (4-20mA) Output for Pump Speed
27 Read Modulating Fan 1 - Speed
33 Read Modulating Burner1 Firing rate
35 Read Lockout Code
Map Descriptor Name
BACnet BACnet
Data Object
Type ID Read/Write
AI 0 Read
AI 1 Read
AI 3 Read
AI 4 Read
AI 5 Read
AI 6 Read
AI 7 Read
AI 12 Read
AI 14 Read
AI 18 Read
AI 19 Read
AI 20 Read
AI 21 Read
AI 22 Read
AI 23 Read
AI 27 Read
AI 33 Read
AI 35 Read
Notes
bit0 = Flow Switch
bit1 = LWCO
bit2 = MRHL
bit3 = SV2 Valve Interlock
bit4 = High Gas Pressure
bit5 = Low Gas Pressure
bit6 = ARHL
bit7 = Condensate Level
bit0 = Field Input 1
bit1 = Field Input 2
0=None
1=Anti-Short Cycle
2=Service
3=DHW
4=Cascade
5=External
6=CH1
7=CH2
10=Anti-Frost
11=Warm Weather Shutdown
bit0 = Run Contact
bit1 = Alarm Contact
bit2 = DHW Pump
bit3 = System Pump
bit5 = Aux Dry Contact 1
bit6 = Aux Dry Contact 2
bit7 = Boiler Pump
bit8 = Aux Powered Contact
bit 0 = N/A
bit 1 = Burner 1 Gas valve 1
mV
RPM
%
LOW FLOW ERROR = 0
LOW WATER CUT OFF ERROR = 1
MANUAL RESET HIGH LIMIT ERROR = 2
BLOCKED FLUE ERROR = 3
HIGH GAS PRESSURE ERROR = 4
LOW GAS PRESSURE ERROR = 5
AUTO RESET HIGH LIMIT ERROR = 6
SPARE SAFETY CHAIN ERROR = 7
OUTLET PROBE ERROR = 8
OUTLET PROBE DRIFT ERROR = 9
OUTLET PROBE HIGH LIMIT ERROR = 10
FLUE PROBE ERROR = 11
FLUE PROBE DRIFT ERROR = 13
FLUE PROBE HIGH LIMIT ERROR = 14
INLET PROBE ERROR = 15
DELTA T ERROR = 16
GENERIC LOCKOUT = 17
BURNER1 MAX TRIALS ERROR = 22
BURNER1 MAX FLAME LOST ERROR = 24
BURNER1 FAN SPEED ERROR = 28
NO LOCKOUT = 255
24VDC ERROR = 30
24VAC ERROR = 31
DHW PROBE ERROR = 32
SYSTEM SUPPLY PROBE ERROR = 33
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