Appendices
Appendix L - Core Measurement Parameters - Energy
115
Building Technologies
125-202
06/06/2017
Appendix L - Core Measurement Parameters - Energy
Measurement Parameters: Energy
BACnet
Object
Identifier
Modbus
Register
Modbus
Offset
(Offset to a
Base of 40001)
kWh – Real Energy defined as Kilowatt-hour
is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time. The kilowatt-hour is not a standard unit in
any formal system, but it is commonly used in electrical applications. The consumption of electrical energy by homes and small businesses is
usually measured in kilowatt-hours.
System Total True Energy (kWh System)
calculated as ABS(kWh L1) + ABS(kWh L2) + ABS(kWh L3), in kWh
= kWh Sys, signed, absolute, in kWh, BACnet
= total kWh Sys value, unsigned, total instantaneous true energy, in kWh
= positive kWh Sys, unsigned, positive instantaneous true energy, in kWh
= negative kWh Sys, unsigned, negative instantaneous true energy, in kWh
NOTES:
If kWh sys value>0, kWh sys pos = kWh sys, kWh sys neg = 0
If kWh sys value<0, kWh sys neg = kWh sys, kWh sys pos = 0
2000
‒
‒
2010
2020
‒
‒
44001 lsw
44002 msw
46001 lsw
46002 msw
47001 lsw
47002 msw
‒
4000 lsw
4001 msw
6000 lsw
6001 msw
7000 lsw
7001 msw
Individual Phase Instantaneous True Energy- L1 (kWh L1)
= kWh L1 value, signed, individual L1 phase true energy in kWh, BACnet
= kWh L1 value, unsigned, individual L2 phase true energy, in kWh
= positive kWh L1 value, unsigned, individual L2 phase true energy, in kWh
= negative kWh L1 value, unsigned, individual L2 phase true energy, in kWh
NOTES:
If kWh L1 value>0, positive kWh L1 = total kWh L1, negative kWh L1 = 0
If kWh L1 Value<0, negative kWh L1 = total kWh L1, positive aPF = 0
1160
‒
‒
2040
‒
2050
‒
‒
44023 lsw
44023 msw
46023 lsw
46024 msw
47023 lsw
47024 msw
‒
4022 lsw
4023 msw
6022 lsw
6023 msw
7022 lsw
7023 msw
Individual Phase Instantaneous True Energy- L2 (kWh L2)
= kWh L2 value, signed, individual L2 phase true energy in kWh, BACnet
= kWh L2 value, unsigned, individual L2 phase true energy, in kWh
= positive kWh L2 value, unsigned, individual L2 phase true energy, in kWh
= negative kWh L2 value, unsigned, individual L2 phase true energy, in kWh
NOTES:
If kWh L2 value>0, positive kWh L2 = kWh L2, negative kWh L2 = 0
If total kWh L2 value<0, negative kWh L2 = kWh L2, positive kWh L2 = 0
1190
‒
‒
2070
‒
2080
‒
‒
44025 lsw
44026 msw
46025 lsw
46026 msw
47025 lsw
47026 msw
‒
4024 lsw
4025 msw
6024 lsw
6025 msw
7024 lsw
7025 msw
Individual Phase Instantaneous True Energy- L3 (kWh L3)
= kWh L3 value, signed, individual L3 phase true energy in kWh, BACnet
= kWh L3 value, unsigned, individual L2 phase true energy, in kWh
= positive kWh L3 value, unsigned, individual L2 phase true energy, in kWh
= negative kWh L3 value, unsigned, individual L2 phase true energy, in kWh
NOTES:
If kWh L3 value>0, positive kWh L3 = kWh L3, negative kWh L3 = 0)
If kWh L3 value<0, negative kWh L3 = kWh L3, positive kWh L3 = 0)
1220
‒
‒
2100
‒
2110
‒
‒
44027 lsw
44028 msw
46027 lsw
46028 msw
47027 lsw
47026 msw
‒
4026 lsw
4027 msw
6026 lsw
6027 msw
7026 lsw
7027 msw