AERCO BMS II BOILER - Manual (Page 98)

APPENDIX H
H-6
APPENDIX H
(cont.)
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H-2. BMS II Controller Standard Holding Register Assignments
The Holding Register address assignments for the BMS II are listed in Table H-2 which follows. Unless
otherwise specified, all Holding Register Menu items are Read/Write (R/W).
Table H-2. BMS II Standard Holding Register Address Mapping
Modbus Data
Address (Hex) Menu Item Units and Range Default/Comments
0x0000
thru
0x0003
(Reserved)
0x0004 Net Header Set
Temp 40 to 220°F
Valid when Hdr Set
Mode=Remote Setpt
and Remote Signal =
Network
0x0005 System Start Temp 32 to 120°F Default = 70°F
0x0006 System Start Option 0 or 1
0 = Temp Only,
1 = Temp and Load Default = 0
0x0007 Manual Hdr Set
Temp/Internal Setpt 40 to 220°F Default = 160°F
0x0008 Bldg Ref Temp 40 to 220°F Default = 70°F
0x0009 Not Applicable
0x000A Not Applicable
0x000B Reset Ratio 0.3 to 3.0
(0.1 increments), Default = 1.2
(Value x 10)
0x000C Max Header Temp 40 to 220°F Default = 200°F
0x000D Min Header Temp 40 to 220°F Default = 40°F
0x000E Start Percent 25 to 100% Default = 20%
0x000F Stop Percent 10 to 45% Default = 16%
0x0010 Integral Gain 0.00 to 9.99 Rep/Min
(in 0.01 increments Default = 0.15 Rep/Min
(Value x 100)
0x0011 Header Set Mode 0, 1, or 2
0 = Constant Setpt
1 = In/Outdoor Reset
2 = Remote Setpt Default = 0
(Constant Setpt))