Siemens SITRANS FST030 - Page 208

Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
hydrocarbon and gas
applications)
● 29: Base viscosity
(only hydrocarbon
applications)
● 30: Base density
(only hydrocarbon
applications)
● 31: LiquIdent (only
hydrocarbon
applications)
● 32: API gravity (only
hydrocarbon
applications)
● 33: Base API gravity
(only hydrocarbon
applications)
● 34: Specific gravity
(only hydrocarbon
applications)
● 35: Base specific
gravity (only
hydrocarbon
applications)
● 36: Rate of change
(ROC) (only
hydrocarbon
applications)
8910 Unsigned / 2 Flow direction Flow direction filter ap‐
plicable for Process val‐
ues (8904) set to 0, 1,
19, or 27.
0
● 0: Positive direction
● 1: Negative direction
● 2: Positive and
negative directions
● 3: Positive and
negative directions
(symmetric mode)
Read /
write
8935 Float / 4 Frequency val‐
ue high
Upper frequency value.
Upper nominal output
range boundary.
10000.0
[Hz]
0.0 - 12500.0 Read /
write
8937 Float / 4 Frequency val‐
ue low
Lower frequency value.
Lower nominal output
range boundary.
0.0
[Hz]
0.0 - 12500.0 Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
208 Operating Instructions, 08/2018, A5E37367739-AD