Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
Operating Instructions, 08/2017, A5E37367739-AC
169
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
1665
Float / 4
Spacing offset Spacing offset (LTN) between
clamp-on sensors for path 5.
0.0
[m]
(8556)
-100.0 - 100.0
Read /
write
1659
Float / 4
Path weight
Fixed weighting factor associ-
ated with path 5.
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)
User calibration
Table A- 26 User calibration
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
1000
Float / 4
Slope correc-
tion factor
Define positive and
negative flow direction.
Default positive flow
direction is indicated by
the arrow on the sen-
sor.
1.0
0.5 - 2.0
Read /
write
1006
Float / 4
Path 1 offset
User calibrated zero
offset for path 1.
Calibrated delta time =
delta time + Path 1
factory Path 1
offset.
0.0
[s]
-1.25E-6 - +1.25E-6
Read /
write
1010
Float / 4
Path 2 offset
User calibrated zero
offset for path 2.
Calibrated delta time =
delta time + Path 2
factory Path 2
offset.
0.0
[s]
-1.25E-6 - +1.25E-6
Read /
write
1014
Float / 4
Path 3 offset
User calibrated zero
offset for path 3.
Calibrated delta time =
delta time + Path 3
factory Path 3
offset.
0.0
[s]
-1.25E-6 - +1.25E-6
Read /
write