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Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
200
Operating Instructions, 08/2017, A5E37367739-AC
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
8809
Unsigned / 2 Flow direction
Flow direction filter
applicable for Process
values (8802) = 0, 1,
19 and 27.
0
•
0: Positive direction
•
1: Negative direction
•
2: Positive and nega-
tive directions
•
3: Positive and nega-
tive directions (sym-
metric mode)
Read /
write
8806
Unsigned / 2 Current mode
Mode of current output. 0
•
0: 4-20 mA (3.5) 3.8-
20.5 (22.6) NAMUR
•
1: 4-20 mA (3.75)
4.0-20.8 (22.6) US
•
2: 4-20 mA (2.0) 4.0-
20.5 (22.0)
•
3: 4-20 mA (2.0) 4.0-
24.0 (25.0)
•
4: 0-20 mA (0.0) 0.0-
20.5 (22.0)
•
5: 0-20 mA (0.0) 0.0-
24.0 (25.0)
Read /
write
8866
Float / 4
Upper range
value volume
flow
Upper volume flow
value that is mapped to
the upper nominal
range boundary se-
lected by Current mode
(8806). Applicable if
Process value (8802) =
1.
0.004 • max.
volume flow
[m
3
/s]
(7500)
-
Read /
write
8868
Float / 4
Lower range
value volume
flow
Lower volume flow
value that is mapped to
the lower nominal
range boundary se-
lected by Current mode
(8806). Applicable if
Process value (8802) =
1.
0
[m
3
/s]
(7500)
-
Read /
write
8810
Float / 4
Upper range
value mass flow
Upper mass flow value
that is mapped to the
upper nominal range
boundary selected by
Current mode (8806).
Applicable if Process
value (8802) = 0.
0.2 • max.
mass flow
[kg/s]
(7400)
-
Read /
write