125
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DN-Series Integrated Programmable Controls
DOAS
SYSTEM MONITORING
TYPE
#
VARIABLE
DESCRIPTION
RANGE
READ/WRITE
MODE (RET)
InputRegister
36
Heating_Command.Val
Heating Command from Program
%
Read_NoWrite
InputRegister
38
Bypass_Command.Val
Bypass Damper Command
%
Read_NoWrite
InputRegister
40
HGRH_Command.Val
HGRH Valve Command
%
Read_NoWrite
InputRegister
98
OA_Temp.Val
OA Temperature
F
Read_NoWrite
InputRegister
42
SF_ControlType_BN
SF_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
43
EF_ControlType_BN
EF_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
44
HTG_ControlType_BN
HTG_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
45
CLG_ControlType_BN
CLG_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
48
Heating_SetPtType_BN
Heating_SetPtType_BN
(See Notes)
Read_NoWrite
13.9.1 Turning the Unit On and OFF
If you plan to use the BMS to turn the unit on and off, make sure you have the control enabled
through the keypad. Use Modbus Coil “OnOffUnitMng.BmsOnOff” at Coil 0. The status can be
read at “DOAS_UnitOn” at Discrete Input 9.
13.9 MODBUS APPLICATION NOTES
All of the following have to be true in order for the unit to be on:
u
There are no serious alarms.
u
The Digital Input for start/stop (terminals 17 and 18) are closed.
u
The unit is turned on at the keypad.
u
The time is within the scheduler “ON” time, if scheduler enabled.
u
The BMS has written the unit on signal, if BMS control is enabled.
13.9.2 Alarms
Two general alarms are available:
u
Serious Alarm: Located at Discrete Input 5, “Alarm_Out.val” indicates whether there is a
serious alarm that stops the unit.
u
Any Alarm: Located at Discrete Input 20, “Any_Alarm_Out.val” indicates whether there is any
alarm present.
To reset the User Reset type alarms, set Coil 0 (or 98) “AlarmMng.AlrmResByBMS” to true.
The program will set it back to false. You can view the status change through Discrete Input 2
“AlarmMng.AlrmRes.”
