Siemens SITRANS F Series, Operating Instructions Manual, Page: 169 / 362

Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
Operating Instructions, 08/2017, A5E37367739-AC
167
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
1515 Float / 4 Spacing offset Spacing offset (LTN) between
clamp-on sensors for path 2.
0.0
[m]
(8556)
-100.0 - 100.0 Read /
write
1509 Float / 4 Path weight Fixed weighting factor associ-
ated with path 2.
For clamp-on systems the in-
stalled paths weightings should
be identical but not zero.
For inline systems the sum of
the installed paths weightings
should be 1.0.
1.0 0.01 - 2.0 Read /
write
(Expert)
Path 3 settings
Table A- 23 Path 3 settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
1550 Float / 4 Sensor fre-
quency
Desired sensor frequency for
path 3.
1100000
[Hz]
80000.0 -
4000000.0
Read /
write
1558 Unsigned / 2 Path geometry The number of crossings the
signal makes through the pipe
(Reflect or direct geometry for
path 3).
E.g.:
Z path = 1
V path = 2
W path = 4
1 1 - 10 Read /
write
1565 Float / 4 Spacing offset Spacing offset (LTN) between
clamp-on sensors for path 3.
0.0
[m]
(8556)
-100.0 - 100.0 Read /
write
1559 Float / 4 Path weight Fixed weighting factor associ-
ated with path 3.
For clamp-on systems the in-
stalled paths weightings should
be identical but not zero.
For inline systems the sum of
the installed paths weightings
should be 1.0.
1.0 0.01 - 2.0 Read /
write
(Expert)