Siemens SITRANS F series Operating Instructions Manual page 209

Modbus Data type /
register Size in bytes
8910 Unsigned / 2
8935 Float / 4
8937 Float / 4
8915 Float / 4
8917 Float / 4
8911 Float / 4
8913 Float / 4
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
Operating Instructions, 08/2017, A5E37367739-AC
Parameter Description
Flow direction Flow direction filter
applicable for Process
values (8904) set to 0,
1, 19, or 27.
Frequency Upper frequency value.
value high Upper nominal output
range boundary.
Frequency Lower frequency value.
value low Lower nominal output
range boundary.
Upper range Upper volume flow
value volume value that is mapped to
flow the upper nominal
range boundary se-
lected by Frequency
value high (8935).
Applicable if Process
value (8904) = 1.
Lower range Lower volume flow
value volume value that is mapped to
flow the lower nominal
range boundary se-
lected by Frequency
value low (8937). Ap-
plicable if Process
value (8904) = 1.
Upper range Upper mass flow value
value mass flow that is mapped to the
upper nominal range
boundary selected by
Frequency value high
(8935). Applicable if
Process value (8904) =
0.
Lower range Lower mass flow value
value mass flow that is mapped to the
lower nominal range
boundary selected by
Frequency value low
(8937). Applicable if
Process value (8904) =
0.
A.9 Modbus holding registers tables
Default value Value range /
[units] Setting options
(units regis-
ter)
0
0: Positive direction
•
1: Negative direction
•
2: Positive and nega-
•
tive directions
3: Positive and nega-
•
tive directions (sym-
metric mode)
10000.0 0.0 - 12500.0
[Hz]
0.0 0.0 - 12500.0
[Hz]
0.4 % • max. -
volume flow
[m /s]
3
(7500)
0.0 -
[m /s]
3
(7500)
0.2 • max. -
mass flow-
[kg/s]
(7400)
0.0 -
[kg/s]
(7400)
Modbus communication
Access
level
Read /
write
Read /
write
Read /
write
Read /
write
Read /
write
Read /
write
Read /
write
207