Siemens SITRANS FST030 - Page 151

Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
8015 Unsigned / 2 Pressure units Units for
pressure
values.
11
● 1: inH2O (inches of water at 68 °F)
● 2: inHg (inches of mercury at 0 °C)
● 3: ftH2O (feet of water at 68 °F)
● 4: mmH2O (millimeters of water
at 68 °F)
● 5: mmHg (millimeters of mercury
at 0 °C)
● 6: psi (pounds per square inch)
● 7: bar
● 8: mbar
● 9: gf/cm² (grams force per square
cm)
● 10: kgf/cm² (kilogram force per
square cm)
● 11: Pa (pascal)
● 12: kPa (kilopascal)
● 13: torr
● 14: atm (atmosphere)
● 170: cmH2O (centimeters of
water at 4 °C)
● 171: mH2O (meters of water at 4
°C)
● 172: cmHg (centimeters of
mercury at 0 °C)
● 173: lb/ft² (pounds per square
foot)
● 174: hPa (hectopascal)
● 176: kg/m² (kilograms per square
meter)
● 177: ftH2O (feet water at 4 °C)
● 178: ftH2O (feet water at 60 °F)
● 179: mHg (meters of mercury at 0
°C)
● 237: MPa (Megapascal)
238: in ftH2O (inches of water at 4
°C)
● 239: mmH2O (millimeters of
water at 4 °C)
Read /
write
7700 Unsigned / 2 Temperature
units
Units for
tempera‐
ture values.
32
● 32: °C (degrees Celsius)
● 33: °F (degrees Fahrenheit)
● 34: °R (degrees Rankine)
● 35: K (kelvins)
Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 151