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Operating Procedures
BMS interconnectivity
The chiller control system supports the following BMS
communication protocols:
•
Modbus RTU
•
Modbus IP
•
BACnet MS/TP
•
BACnet IP
•
BACnet Ethernet (Allen-Bradley)
•
LONWorks
•
N2 Metasys
All chiller variables available for BMS system are read-only
except for:
1. Chiller Setpoint - Variable tag CHIL_EN_01.
Table 12. BMS data listing - AV and AO
Tag Name
Description
Chiller Enable
Chiller Enable Set from BMS and Feedback
Chiller Setpoint
Chiller Setpoint from BMS
Chiller Inlet Fluid
Chiller Inlet Temperature (Integer Value with 1 implied decimals)
Temperature
Chiller Outlet Fluid
Chiller Outlet Temperature (Integer Value with 1 implied decimals)
Temperature
Condenser Inlet
Condenser Inlet Temperature (Integer Value with 1 implied
Fluid Temperature
decimals)
Condenser Outlet
Condenser Outlet Temperature (Integer Value with 1 implied
Fluid Temperature
decimals)
Condenser Setpoint
Condenser Setpoint (Integer Value with 1 implied decimal)
Chiller Limit Percent (Integer Value with 1 implied decimal)
Chiller Limit
Chiller State (see Details Page for State Enumeration)
Chiller State
Chiller Power (Integer Value with 1 implied decimal)
Chiller Power
Chiller 3-Phase
Chiller Current
Current
Compressor Power (Integer Value with 1 implied decimal) -
DTC1 Compressor
Compressor #1
Power
Compressor Power (Integer Value with 1 implied decimal) -
DTC2 Compressor
Compressor #2
Power
Compressor Power (Integer Value with 1 implied decimal) -
DTC3 Compressor
Compressor #3
Power
Compressor Power (Integer Value with 1 implied decimal) -
DTC4 Compressor
Compressor #4
Power
Compressor Power (Integer Value with 1 implied decimal) -
DTC5 Compressor
Compressor #5
Power
Compressor Power (Integer Value with 1 implied decimal) -
DTC6 Compressor
Compressor #6
Power
Chiller External Load
Chiller External Load Limiting (Integer Value with 1 implied decimal)
Limiting
Suction Pressure (Integer Value with 1 implied decimal) -
DTC1 Suction
Compressor #1
Pressure
40
2. Chiller Off/Hand/Auto control - Variable tag
CHIL_SP_02.
These two points will be exposed to BMS as read-write
variables when corresponding options are enabled on HMI
Configuration screen only.
Figure 31. BMS configuration screen
When BMS is connected in the preferred protocol, the
entire data set is exposed. The listing is in the following
table:
Object
Array
Type
Offset
AV
0
AV
1
AO
2
AO
3
AO
4
AO
5
AO
6
AO
7
AO
8
AO
9
AO
10
AO
11
AO
12
AO
13
AO
14
AO
15
AO
16
AO
17
AO
19
Object
Modbus
Instance
Address
1
40001
2
40002
3
40003
4
40004
5
40005
6
40006
7
40007
8
40008
9
40009
10
40010
11
40011
12
40012
13
40013
14
40014
15
40015
16
40016
17
40017
18
40018
19
40020
ARTC-SVX007A-EN
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