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Modbus RTU (Optional)
As an option, the PLC controller is available with a Modbus output on the PLC. The Modbus default set up uses a
Baud Rate of 57,600, Data Length of 8 bits, Odd Parity, and Stop Bit of 1, Com Port 1.
Table 16 – PLC Controller Modbus RTU Parameters
Modbus Register
Data Format
3009
3010
30001
30002
Data
Access Level
BOOL
Write
BOOL
Write
WORD
BOOL
Bit 0
BOOL
Bit 1
BOOL
Bit 2
BOOL
Bit 3
BOOL
Bit 4
BOOL
Bit 5
BOOL
Bit 6
BOOL
Bit 7
BOOL
Bit 8
BOOL
Bit 9
BOOL
Bit 10
BOOL
Bit 11
BOOL
Bit 12
BOOL
Bit 13
BOOL
Bit 14
BOOL
Bit 15
WORD
BOOL
Bit 0
BOOL
Bit 1
BOOL
Bit 2
BOOL
Bit 3
BOOL
Bit 4
BOOL
Bit 5
BOOL
Bit 6
BOOL
Bit 7
BOOL
Bit 8
BOOL
Bit 9
BOOL
Bit 10
BOOL
Bit 11
BOOL
Bit 12
BOOL
Bit 13
BOOL
Bit 14
BOOL
Bit 15
Modbus Start
Modbus Stop
Read
SYSTEM STATUS
Read
System Running
Read
Remote Mode
Read
Compressor 1 Enable
Read
Compressor 2 Enable
Read
Compressor 3 Enable
Read
Water Pump 1 Enable
Read
Water Pump 2 Enable
Read
Fan 1 Enable
Read
Fan 2 Enable
Read
Fan 3 Enable
Read
Fan 4 Enable
Read
Fan 5 Enable
Read
Fan 6 Enable
Read
Monitor High/Low
Read
NQV Option Enable
Read
System Stopping
Read
SYSTEM ALARMS/WARNINGS
Read
Water Pump 1 Overload Alarm
Read
Tank Low Level Alarm
Read
Pump 1 Flow Alarm
Read
Freezestat Alarm
Read
High Supply Water
Read
Supply Water Sensor Alarm
Read
Evaporator Leaving Water Temperature Sensor Alarm
Read
High High Supply Water
Read
Low Supply Water Warning
Read
Low Low Supply Water Alarm
Read
High Refrigerant Pressure Alarm
Read
Low Refrigerant Pressure Alarm
Read
Modbus Fault
Read
Water Pump 2 Overload
Read
Fan 1 Overload Alarm
Read
Fan 2 Overload Alarm
25
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