44
ARTC-SVX013A-EN
• EthernetIP (Allen-Bradley®)
• N2 Metasys
• LONWorks with optional hardware
Special Functions
All chiller variables available for BMS system are read-only
except for (all Objects type AV):
• Alarm reset – Value of 2 is required to reset alarms.
• Adiabatic Cooling EN– if the chiller is equipped then 0
– disable and 1 – enable.
• Low Noise – engages low noise system: 0 – disable
and 1 – enable.
• Low Setpoint – Value for fan speed in low noise mode
– in % of full Speed
• External Load Limiting – setpoint in kW.
• Chiller Flow – setpoint in units of selected control
mode.
• Chiller Setpoint - Variable tag CHIL_EN_01 (see
below).
• Chiller Off/Hand/Auto control - Variable tag CHIL_
SP_02 (see below).
Note: Chiller Setpoint and Chiller Enable require special
arbitration and are exposed to BMS as read-write
variables when corresponding options are enabled
on HMI Configuration screen only. Enable indicates
that the chiller relies on the BMS interface for
control; disable indicates that signal source is local
or hardwired. See Special Functions: Hand/Off/Auto
and Chiller Setpoint Control.
Figure 24. BMS configuration screen
All other AV points are processed as a change of value.
Default Configuration
As part of factory start up, Trane sets the BMS interface in
the following way:
• Default Password is !admin321.
• Default security is HTTP.
• Protocol is determined by project submittal.
• Ethernet port 1 is dedicated to internal chiller
communication and is configured as Modbus TCP. IP
address is factory set.
All other settings like instance IDs, protocol specifics (baud
rates, parity, CRC, etc.), and specific security
configurations are deferred to field start-up.
When BMS is connected in the preferred protocol, the
entire data set is exposed. The listing is in the following two
tables:
Table 14. BMS analog data listing
Tag Name Description
Object
Type
Object Id
Modbus
Register
EIP Read Tag
Name
EIP Write Tag
Name
Chiller Enable Chiller Enable Set from BMS and Feedback AO 1 30001
AO_01[0] WR_AO_01[0]
Chiller User Setpoint Chiller Setpoint from BMS
AO 2 30002
AO_01_SC[1] WR_AO_01_SC[1]
Chiller Inlet Fluid Temperature
Chiller Inlet Temperature (Integer Value with 1
implied decimals)
AO 3 30003
AO_01_SC[2] WR_AO_01_SC[2]
Chiller Outlet Fluid
Temperature
Chiller Outlet Temperature (Integer Value with 1
implied decimals)
AO 4 30004
AO_01_SC[3] WR_AO_01_SC[3]
Condenser Inlet Fluid
Temperature
Condenser Inlet Temperature (Integer Value with 1
implied decimals)
AO 5 30005
AO_01_SC[4] WR_AO_01_SC[4]
Condenser Outlet Fluid
Temperature
Condenser Outlet Temperature (Integer Value with
1 implied decimals)
AO 6 30006
AO_01_SC[5] WR_AO_01_SC[5]
Condenser Setpoint
Condenser Setpoint (Integer Value with 1 implied
decimal)
AO 7 30007
AO_01_SC[6] WR_AO_01_SC[6]
Chiller Limit
Chiller Limit Percent (Integer Value with 1 implied
decimal)
AO 8 30008
AO_01[7] WR_AO_01[7]
Chiller State
Chiller State (see Details Page for State
Enumeration)
AO 9 30009
AO_01[8] WR_AO_01[8]
Chiller Power
Chiller Power (Integer Value with 1 implied
decimal)
AO 10 30010
AO_01_SC[9] WR_AO_01_SC[9]
Chiller 3-Phase Current Chiller Current AO 11 30011
AO_01[10] WR_AO_01[10]
DTC1 Compressor Power
Compressor Power (Integer Value with 1 implied
decimal) - Compressor #1
AO 12 30012
AO_01_SC[11] WR_AO_01_SC[11]
Operating Procedures
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