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Configuration bits – Lochinvar SYNC Modbus Communication 1.0- 1.3- 1.5 User Manual

Page 8

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8

Modbus Instructions

Input Registers

Address

Description

Default

Unit

Min.

Max.

Resolution

30001

Discrete Inputs 1 - 16

0

NA

0

65535

1

30002

Discrete Inputs 17 - 32

0

NA

0

65535

1

30003

Discrete Inputs 33 - 48

0

NA

0

65535

1

30004

System / Cascade Setpoint

0

Degrees Celsius

0

130

0,5

30006

Cascade Total Power

0

%

100

800

1

30007

Cascade Current Power

0

%

0

800

1

30008

Outlet Setpoint 1

0

Degrees Celsius

0

130

0,5

30009

Outlet Temperature 1

0

Degrees Celsius

0

130

0,1

30010

Inlet Temperature 1

0

Degrees Celsius

-20

130

0,1

30011

Flue Temperature 1

0

Degrees Celsius

-20

130

0,1

30012

Firing Rate 1

0

%

0

100

1

30014

Boiler 1 Status Code

0

NA

0

65535

1

30015

Boiler 1 Blocking Code

0

NA

0

65535

1

30016

Boiler 1 Lockout Code

0

NA

0

65535

1

30017

Outlet Setpoint 2

0

Degrees Celsius

0

130

0,5

30018

Outlet Temperature 2

0

Degrees Celsius

0

130

0,1

30019

Inlet Temperature 2

0

Degrees Celsius

-20

130

0,1

30020

Flue Temperature 2

0

Degrees Celsius

-20

130

0,1

30021

Firing Rate 2

0

%

0

100

1

30023

Boiler 2 Status Code

0

NA

0

65535

1

30024

Boiler 2 Blocking Code

0

NA

0

65535

1

30025

Boiler 2 Lockout Code

0

NA

0

65535

1

Holding Registers

40001

Configuration

0

NA

0

65535

1

40002

Coils

0

NA

0

65535

1

40003

0-10 Volt Input / Rate Command /
Setpoint Command

0

%

0

100

1

40004

Tank Setpoint

0

Degrees Celsius

0

87,5

0,5

40005

Tank Temperature

0

Degrees Celsius

-20

130

0,1

40006

Outdoor Temperature

0

Degrees Celsius

-40

60

0,1

40007

System Supply Temperature

0

Degrees Celsius

-20

130

0,1

SYNC Boiler Memory Map

3

Memory Map

Configuration Bits

Address 40001 contains configuration bits sent from the BAS to the boiler. These bits tell the boiler to use its own internal inputs,
or inputs from the BAS. When a bit is set to 1, the boiler will ignore the corresponding value contained internally, and expect the
BAS to write that value into the Holding Registers. The configuration bits are as follows:

Bit 4: System Supply Temperature
Bit 5: Outdoor Temperature
Bit 6: Tank Temperature
Bit 7: System Return Temperature
Bit 8 - 15: Not Used (Default = 0)

Bit 0 (LSB): Boiler Enable
Bit 1: Tank Thermostat
Bit 2: Rate Command / 10 - 10V Input / Setpoint Command
Bit 3: Tank Setpoint