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AERCO Control System (ACS)
APPENDIX H:
ACS Modbus Address Assignments
11/22/2017
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
Page 129 of 139
OMM-0081_0F
Phone: 800-526-0288
GF-131
TABLE H2: ACS Standard Holding Register Address Mapping
Modbus Data
Address
Decimal (Hex)
Menu Item
Units and Range
Default/
Comments
20 (0x0014)
Aux Relay Open
0 to 99%
Default = 45%
21 (0x0015)
Aux Relay Mode
0 or 1
0 = 100% Fire Rate
1 = 100% Fire Rate and Off
Default = 1
(100% Fire Rate & Off)
22 (0x0016)
Failsafe Mode
0 or 1
0 = Shutdown
1 = Constant Setpt
Default = 0
(Shutdown)
23 (0x0017)
Fault Alarm Relay Mode
0, 1, 2, 3
0 = All Faults,
1 = No Interlock
2 = Interlock 1
3 = Interlock 2
Default = 0
(All Faults)
24 (0x0018)
Fault Alarm Clear Method
0 or 1
0 = Automatic
1 = Manual
Default = 0
(Automatic)
25 (0x0019)
Boiler Operation Mode
0, 1 or 2
0 = Parallel
1 = Sequential
2 = Combination
Default = 1
(Sequential)
26 (0x001A)
Not Applicable
27 (0x001B)
(Reserved)
28 (0x001C)
(Reserved)
29 (0x001D)
(Reserved)
30 (0x001E)
Max Power Input
50 to 100%
Default = 100%
(Fire Rate)
31 (0x001F)
Sys Intlk Config
0 or 1
0 = Always Enabled
1 = Start Enabled
Default = 1
(Start Enabled)
32 (0x0020)
Real Time Clock Minutes
00 to 59
Present Time
33 (0x0021)
Real Time Clock
Hours
00 to 23 Hours
Present Time
34 (0x0022)
Real Time Clock
Day of Week
1 to 7
Present Day
35 (0x0023)
Real Time Clock
Year
00 to 99
Present Year