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Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
180
Operating Instructions, 08/2017, A5E37367739-AC
A.9.4.2
Process values
Volume flow settings
Table A- 29 Volume flow settings
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
7510
Float / 4
Low flow cut-off Volume flow limit for
low flow cut-off. Below
limit volume flow output
is forced to zero.
Sensor size
specific
0 - max. volume flow
Read /
write
7501
Float / 4
Upper alarm
limit
Exceeding this limit
causes an alarm.
max. volume
flow
[m
3
/s]
(7500)
-max. volume flow -
+max. volume flow
Read /
write
7503
Float / 4
Upper warning
limit
Exceeding this limit
causes a warning.
max. volume
flow
[m
3
/s]
(7500)
-max. volume flow -
+max. volume flow
Read /
write
7505
Float / 4
Lower warning
limit
Falling below this limit
causes a warning.
-max. volume
flow
[m
3
/s]
(7500)
-max. volume flow -
+max. volume flow
Read /
write
7507
Float / 4
Lower alarm
limit
Falling below this limit
causes an alarm.
-max. volume
flow
[m
3
/s]
(7500)
-max. volume flow -
+max. volume flow
Read /
write
7512
Float / 4
Hysteresis
Hysteresis that affects
the alarm and warning
limits.
0.0
[m
3
/s]
(7500)
0 - max. volume flow
Read /
write
Mass flow settings
Table A- 30 Mass flow settings
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
7410
Float / 4
Low flow cut-off Mass flow limit for low
flow cut-off. Below limit
mass flow output is
forced to zero.
0.001 x max.
mass flow
[kg/s]
(7400)
0 - max. mass flow
Read /
write
7401
Float / 4
Upper alarm
limit
Exceeding this limit
causes an alarm.
max. mass
flow
[kg/s]
(7400)
-max. mass flow -
+max. mass flow
Read /
write
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