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

square metre

1

4609099

ft²

square foot

2

13387

mA

milliampere

3

4279632

A

ampere

4

5195853

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

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