Mapping the engineering units used OPC UA is not quite easy. Table 252 shows those units which are identical in both standards and thus can be easily mapped.
Rows marked in yellow, not having an OPC UA UnitId, are handled differently. For those, an EngineeringUnits shall be used having “http://opcfoundation.org/UA/BACnet_V2/” as NamespaceUri, the “BACnetEngineeringUnits enumeration value” as UnitId, the OPC UA DisplayName of the table as DisplayName and the OPC UA Description of the table as Description.
Table 252 – Mapping of BACnet EngineeringUnits to OPC UA UnitIds
BACnetEngineeringUnits enumeration value |
OPC UA UnitId |
OPC UA DisplayName |
OPC UA Description |
0 |
5067851 |
m² |
square metre |
1 |
4609099 |
ft² |
square foot |
2 |
13387 |
mA |
milliampere |
3 |
4279632 |
A |
ampere |
4 |
5195853 |
Ω |
ohm |
5 |
5655636 |
V |
volt |
6 |
4937300 |
kV |
kilovolt |
7 |
4339512 |
MV |
megavolt |
8 |
4469814 |
V·A |
volt - ampere |
9 |
4937281 |
kV·A |
kilovolt - ampere |
10 |
5068353 |
MV·A |
megavolt - ampere |
11 |
|
|
volt-amperes-reactive |
12 |
19253 |
kvar |
kilovolt ampere (reactive) |
13 |
|
|
megavolt-amperes-reactive |
14 |
|
|
degrees-phase |
15 |
|
|
power-factor |
16 |
4869973 |
J |
joule |
17 |
4934223 |
kJ |
kilojoule |
18 |
5720146 |
W·h |
watt hour |
19 |
4937544 |
kW·h |
kilowatt hour |
20 |
4862777 |
Btu |
British thermal unit (mean) |
21 |
5125938 |
thm (US) |
therm (U.S.) |
22 |
13399 |
ton (US) /h |
ton (US) per hour |
23 |
|
|
joules-per-kilogram-dry-air |
24 |
|
|
btus-per-pound-dry-air |
25 |
|
|
cycles-per-hour |
26 |
|
|
cycles-per-minute |
27 |
4740186 |
Hz |
hertz |
28 |
|
|
grams-of-water-per-kilogram-dry-air |
29 |
|
|
percent-relative-humidity |
30 |
5066068 |
mm |
millimetre |
31 |
5067858 |
m |
metre |
32 |
4804168 |
in |
inch |
33 |
4607828 |
ft |
foot |
34 |
|
|
watts-per-square-foot |
35 |
|
|
watts-per-square-meter |
36 |
5002573 |
lm |
lumen |
37 |
5002584 |
lx |
lux |
38 |
5255735 |
ftc |
footcandle |
39 |
4933453 |
kg |
kilogram |
40 |
|
|
pounds-mass |
41 |
|
|
tons |
42 |
4933459 |
kg/s |
kilogram per second |
43 |
4600625 |
kg/min |
kilogram per minute |
44 |
4536627 |
kg/h |
kilogram per hour |
45 |
|
|
pounds-mass-per-minute |
46 |
|
|
pounds-mass-per-hour |
47 |
5723220 |
W |
watt |
48 |
4937556 |
kW |
kilowatt |
49 |
5062999 |
MW |
megawatt |
50 |
4863031 |
Btuth/h |
British thermal unit (thermochemical) per hour |
51 |
|
|
horsepower |
52 |
|
|
tons-refrigeration |
53 |
5259596 |
Pa |
pascal |
54 |
4935745 |
kPa |
kilopascal |
55 |
4342098 |
bar |
bar [unit of pressure] |
56 |
20563 |
lbf/in² |
pound-force per square inch |
57 |
|
|
centimeters-of-water |
58 |
4601656 |
inH2O |
inch of water |
59 |
|
|
millimeters-of-mercury |
60 |
4864057 |
cm Hg |
centimetre of mercury |
61 |
4601657 |
inHg |
inch of mercury |
62 |
4408652 |
°C |
degree Celsius |
63 |
4932940 |
K |
kelvin |
64 |
4604232 |
°F |
degree Fahrenheit |
65 |
|
|
degree-days-Celsius |
66 |
|
|
degree-days-Fahrenheit |
67 |
|
|
years |
68 |
5066574 |
mo |
month |
69 |
5719365 |
wk |
week |
70 |
4473177 |
d |
day |
71 |
4740434 |
h |
hour |
72 |
5065038 |
min |
minute [unit of time] |
73 |
5457219 |
s |
second [unit of time] |
74 |
5067859 |
m/s |
metre per second |
75 |
4934984 |
km/h |
kilometre per hour |
76 |
18003 |
ft/s |
foot per second |
77 |
18002 |
ft/min |
foot per minute |
78 |
18509 |
mile/h |
mile per hour (statute mile) |
79 |
4609105 |
ft³ |
cubic foot |
80 |
5067857 |
m³ |
cubic metre |
81 |
|
|
imperial-gallons |
82 |
5002322 |
l |
litre |
83 |
4672588 |
gal (US) |
gallon (US) |
84 |
12876 |
ft³/min |
cubic foot per minute |
85 |
5067091 |
m³/s |
cubic metre per second |
86 |
18227 |
gal (UK) /min |
Imperial gallon per minute |
87 |
4666673 |
l/s |
litre per second |
88 |
19506 |
l/min |
litre per minute |
89 |
18226 |
gal (US) /min |
US gallon per minute |
90 |
17476 |
° |
degree [unit of angle] |
91 |
4731186 |
°C/h |
degree Celsius per hour |
92 |
4731187 |
°C/min |
degree Celsius per minute |
93 |
4862515 |
°F/h |
degree Fahrenheit per hour |
94 |
4862516 |
°F/min |
degree Fahrenheit per minute |
95 |
|
|
no-units |
96 |
|
|
parts-per-million |
97 |
|
|
parts-per-billion |
98 |
20529 |
% |
percent |
99 |
|
|
percent-per-second |
100 |
|
|
per-minute |
101 |
|
|
per-second |
102 |
|
|
psi-per-degree-Fahrenheit |
103 |
|
|
radians |
104 |
5394509 |
r/min |
revolutions per minute |
105 |
|
|
currency1 |
106 |
|
|
currency2 |
107 |
|
|
currency3 |
108 |
|
|
currency4 |
109 |
|
|
currency5 |
110 |
|
|
currency6 |
111 |
|
|
currency7 |
112 |
|
|
currency8 |
113 |
|
|
currency9 |
114 |
|
|
currency10 |
115 |
4804171 |
in² |
square inch |
116 |
4410699 |
cm² |
square centimetre |
117 |
16730 |
BtuIT/lb |
British thermal unit (international table) per pound |
118 |
4410708 |
cm |
centimetre |
119 |
|
|
pounds-mass-per-second |
120 |
|
|
delta-degrees-Fahrenheit |
121 |
|
|
delta-degrees-Kelvin |
122 |
4338745 |
kΩ |
kiloohm |
123 |
4339509 |
MΩ |
megaohm |
124 |
12890 |
mV |
millivolt |
125 |
4338738 |
kJ/kg |
kilojoule per kilogram |
126 |
13122 |
MJ |
megajoule |
127 |
|
|
joules-per-degree-Kelvin |
128 |
|
|
joules-per-kilogram-degree-Kelvin |
129 |
5064794 |
kHz |
kilohertz |
130 |
4933722 |
MHz |
megahertz |
131 |
|
|
per-hour |
132 |
4404017 |
mW |
milliwatt |
133 |
4274487 |
hPa |
hectopascal |
134 |
5063250 |
mbar |
millibar |
135 |
5067080 |
m³/h |
cubic metre per hour |
136 |
|
|
liters-per-hour |
137 |
|
|
kilowatt-hours-per-square-meter |
138 |
|
|
kilowatt-hours-per-square-foot |
139 |
|
|
megajoules-per-square-meter |
140 |
|
|
megajoules-per-square-foot |
141 |
|
|
watts-per-square-meter-degree-kelvin |
142 |
|
|
cubic-feet-per-second |
143 |
|
|
percent-obscuration-per-foot |
144 |
|
|
percent-obscuration-per-meter |
145 |
4535349 |
mΩ |
milliohm |
146 |
5068616 |
MW·h |
megawatt hour (1000 kW.h) |
147 |
|
|
kilo-btus |
148 |
|
|
mega-btus |
149 |
|
|
kilojoules-per-kilogram-dry-air |
150 |
|
|
megajoules-per-kilogram-dry-air |
151 |
|
|
kilojoules-per-degree-Kelvin |
152 |
|
|
megajoules-per-degree-Kelvin |
153 |
5129559 |
N |
newton |
154 |
4600377 |
g/s |
gram per second |
155 |
4600376 |
g/min |
gram per minute |
156 |
4534584 |
t/h |
tonne per hour |
157 |
|
|
kilo-btus-per-hour |
158 |
|
|
hundredths-seconds |
159 |
4403766 |
ms |
millisecond |
160 |
20053 |
N·m |
newton metre |
161 |
4403510 |
mm/s |
millimetre per second |
162 |
4732977 |
mm/min |
millimetre per minute |
163 |
12888 |
m/min |
metre per minute |
164 |
5060144 |
m/h |
metre per hour |
165 |
4666675 |
m³/min |
cubic metre per minute |
166 |
5067595 |
m/s² |
metre per second squared |
167 |
16709 |
A/m |
ampere per metre |
168 |
4273201 |
A/m² |
ampere per square metre |
169 |
16693 |
A·m² |
ampere square metre |
170 |
4604242 |
F |
farad |
171 |
14385 |
H |
henry |
172 |
4404785 |
Ω·m |
ohm metre |
173 |
5458245 |
S |
siemens |
174 |
4469040 |
S/m |
siemens per metre |
175 |
4469555 |
T |
tesla |
176 |
4469816 |
V/K |
volt per kelvin |
177 |
4470064 |
V/m |
volt per metre |
178 |
5719362 |
Wb |
weber |
179 |
4408396 |
cd |
candela |
180 |
4272692 |
cd/m² |
candela per square metre |
181 |
4600112 |
K/h |
kelvin per hour |
182 |
4600113 |
K/min |
kelvin per minute |
183 |
4337976 |
J·s |
joule second |
184 |
12865 |
rad/s |
radian per second |
185 |
4732217 |
m²/N |
square metre per newton |
186 |
4934993 |
kg/m³ |
kilogram per cubic metre |
187 |
4404535 |
N·s |
newton second |
188 |
13392 |
N/m |
newton per metre |
189 |
4470067 |
W/(m·K) |
watt per metre kelvin |
190 |
4340025 |
µS |
microsiemens |
191 |
12875 |
ft³/h |
cubic foot per hour |
192 |
|
|
us-gallons-per-hour |
193 |
4934996 |
km |
kilometre |
194 |
13384 |
µm |
micrometre (micron) |
195 |
4674125 |
g |
gram |
196 |
5064525 |
mg |
milligram |
197 |
5065812 |
ml |
millilitre |
198 |
13360 |
ml/s |
millilitre per second |
199 |
12878 |
dB |
decibel |
200 |
|
|
decibels-millivolt |
201 |
|
|
decibels-volt |
202 |
4403767 |
mS |
millisiemens |
203 |
|
|
watt-hours-reactive |
204 |
|
|
kilowatt-hours-reactive |
205 |
|
|
megawatt-hours-reactive |
206 |
|
|
millimeters-of-water |
207 |
|
|
per-mille |
208 |
|
|
grams-per-gram |
209 |
5059129 |
kg/kg |
kilogram per kilogram |
210 |
|
|
grams-per-kilogram |
211 |
4732468 |
mg/g |
milligram per gram |
212 |
20033 |
mg/kg |
milligram per kilogram |
213 |
18250 |
g/ml |
gram per millilitre |
214 |
18252 |
g/l |
gram per litre |
215 |
19761 |
mg/l |
milligram per litre |
216 |
4731449 |
µg/l |
microgram per litre |
217 |
4274483 |
g/m³ |
gram per cubic metre |
218 |
18256 |
mg/m³ |
milligram per cubic metre |
219 |
18257 |
µg/m³ |
microgram per cubic metre |
220 |
|
|
nanograms-per-cubic-meter |
221 |
12851 |
g/cm³ |
gram per cubic centimetre |
222 |
4346188 |
Bq |
becquerel |
223 |
12881 |
kBq |
kilobecquerel |
224 |
13390 |
MBq |
megabecquerel |
225 |
4274485 |
Gy |
gray |
226 |
4403507 |
mGy |
milligray |
227 |
|
|
microgray |
228 |
4469043 |
Sv |
sievert |
229 |
4403768 |
mSv |
millisievert |
230 |
|
|
microsieverts |
231 |
5257010 |
µSv/h |
microsievert per hour |
232 |
|
|
decibels-a |
233 |
|
|
nephelometric-turbidity-unit |
234 |
5321520 |
pH |
pH (potential of Hydrogen) |
235 |
18253 |
g/m² |
gram per square metre |
236 |
|
|
minutes-per-degree-kelvin |