Siemens SITRANS FST030 - Page 197

Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
8439 Float / 4 Standard vol‐
ume lower
alarm limit
Falling below this limit
causes an alarm when
volume flow is selected
as input.
Min. floating
point value
[Sl]
(8422)
Read /
write
8441 Float / 4 Standard vol‐
ume alarm hys‐
teresis
Hysteresis that affects
the alarm and warning
limits when volume
flow is selected as in‐
put.
0.0
[Sl]
(8422)
- Read /
write
Totalizer 3 settings
Table A-48 Totalizer 3 settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
8505 Unsigned / 2 Process value Select process value
for totalization.
0
● 0: Cut-off filtered
mass flow
● 1: Cut-off filtered
volume flow
● 27: Cut-off filtered
standard volume flow
(only hydrocarbon
and gas applications)
Read /
write
8502 Unsigned / 2 Fail-safe behav‐
ior
Behavior of the totaliz‐
er during the occur‐
ence of bad input value.
0
● 0: RUN; totalization is
continued using the
bad input value.
● 1: HOLD; totalization
is stopped.
● 2: MEMORY;
totalization is
continued based on
the last incoming
good value.
Read /
write
8523 Float / 4 Volume upper
alarm limit
Exceeding this limit
causes an alarm when
volume flow is selected
as input.
Max. floating
point value
[m
3
]
(8521)
Read /
write
8525 Float / 4 Volume upper
warning limit
Exceeding this limit
causes a warning when
volume flow is selected
as input.
Max. floating
point value
[m
3
]
(8521)
Read /
write
8527 Float / 4 Volume lower
warning limit
Falling below this limit
causes a warning when
volume flow is selected
as input.
Min. floating
point value
[m
3
]
(8521)
Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 197