Memory Map Primary Data Tables; Crest Boiler Memory Map; Modbus - Crest Audio 1.5 Instructions Manual

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Memory Map
Primary Data Tables
Table
Discrete Inputs
Coils
Input Registers
Holding Registers

Crest Boiler Memory Map

Address
00001 Boiler Enable
00005 Tank Thermostat
10001 Manual Reset High Limit
10002 Flow Switch
10003 Gas Pressure Switch
10004 Louver Proving Switch
10005 Blower Proving Switch 1
10006 Blocked Drain Switch
10008 Flame 1
10009 Enable
10010 Tank Thermostat
10011 Blocked Flue
10013 Blower Proving Switch 2
10021 Flue Damper Proving Switch
10023 Flame 2
10033 Run-time Contacts
10034 Alarm Contacts
10035 SH Pump
10036 HWG Pump
10037 Louver Relay
10038 Gas Valve 1
10039 System Pump
10044 Vent Damper Relay
10046 Gas Valve 2
10049 Blower #1 Power
10050 Blower #2 Power
10051 Spark Igniter
Data Type
Single Bit
Single Bit
16-Bit Word
16 Bit Word
Coils
Description
Discrete Inputs
Read Only
Read / Write
Read Only
Read / Write
Default Unit
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
0 1=ON / 0=OFF
ModBus Instructions
Read / Write
Min. Max. Resolution
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
0 1 1
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