Thermal Solutions Boiler Control TSBC - Page 27

TSBC Instruction Manual Page 27 of 48
Installation
RS485 Modbus Network
Modbus Addresses (continued)
Coil Address Description Read/Write coil = 0 coil = 1 Notes
00043
Annunciator Remote Temp Fail
Off
On
4
00044
Annunciator Remote In Fail
Off
On
4
00045
Annunciator Comm Fail
Off
On
4
00046
Annunciator Low Inlet Temp
Off
On
4
00047
Annunciator Memory Failure
Off
On
4
Modbus
Register
Address
Description
Read/
Write
Engineering
Units for
Register
= 0
Engineering
Units for
Register
= 100
Units
Notes
40001
Boiler Outlet Water Temperature
-50 300 F
40002
Boiler Inlet Water Temperature
-50 300 F
40003
Outside Air Temperature
-50 300 F
40004
Boiler Actual Setpoint
60 230 F
40005
Remote System Temperature
-50 300 F
40006
Remote Firing Rate or Remote Setpoint
Y
0 100 or 300 % or F 1
40007 PCB Temperature Sensor -50 300 F
40008
Firing Rate Output to Mod Motor
0 100 %
40009
Minimum Return Temperature Setpoint
110 180 F
40010
Mixing Valve Output
0 100 %
40011
Control Mode
1 7
Notes
1. After a Modus communication failure, while using the Modbus connection to monitor or control the boilers, the
‘Comm Failure’ alarm is not cleared until a successful write to both the Remote On / Off Modbus Command
(00004) and Remote Firing Rate or Remote Setpoint (40006) points have been completed, power is cycled or
the ‘Protocol’ parameter is changed from Modbus to Peer-to-Peer and back again.
2. The limit string points (00006 - 00011) are only monitored when there is a Call For Heat. Additionally, if one of
these items is ‘open’ items down stream are not monitored.
3. The boiler "state" points (00020 - 00032) are mutually exclusive (i.e. only one is asserted at a time). This will
reflect the state of the message on the front of the boiler. Refer to page 6 for an explanation of each state.
4. The “Annunciated” points (00033 – 00046) reflect the state of the signals used to control the displayed Alarm
Message. Refer to pages 36 & 37 for an explanation of each annunciator point.
5. “General Alarm” point (00015) turns “On” when the boiler is indicating any alarm condition.
To establish a Modbus network set the following parameters:
Communication Menu:
Protocol = Modbus
Modbus Address = Give each boiler a unique address.
Baud Rate = Set identical to remote system.
Parity = Set identical to remote system.
Connect all boilers using a RJ11 ended telephone cable.