Siemens SITRANS FST030 - Page 164

Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
1223 Unsigned / 2 Downstream
pipe geometry
Compensation for
downstream pipe ge‐
ometry.
0
● 0: Straight run
● 1: Single elbow
● 2: Double elbow (in-
plane)
● 3: Double elbow (out-
of-plane)
● 4: Reducer
● 5: Expansion
Read /
write
1224 Unsigned / 2 Downstream
distance
The distance to the
downstream flow dis‐
turbance in multiples of
inner pipe diameter.
0 0 - 40 Read /
write
Process medium characteristics
Table A-17 Process medium characteristics
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
1825 Float / 4 Expected
sound velocity
Expected sound veloci‐
ty in the medium at me‐
dium temperature.
1500.0
[m/s]
(7648)
100.0 - 2500.0 Read /
write
1701 Float / 4 Fixed medium
temperature
Fixed medium temper‐
ature value used for
compensation.
20
[°C]
(7700)
-273 - 400 Read /
write
1703 Float / 4 Fixed process
pressure
Fixed process pressure
value used for compen‐
sation.
700000.0
[Pa]
(8015)
0.0 - 1E+8 Read /
write
1705 Float / 4 Fixed process
viscosity
Fixed process viscosity
value used for compen‐
sation.
0.000001
[m
2
/s]
(7524)
0.0 - 5000.0 Read /
write
1707 Float / 4 Fixed process
density
Fixed process density
used for compensation.
1000.0
[kg/m
3
]
(7600)
0.0 - 2000.0 Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
164 Operating Instructions, 08/2018, A5E37367739-AD