Siemens SITRANS FST030 - Totalizers

Rate of change (ROC) settings
Table A-45 Rate of change (ROC) settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
7540 Float / 4 Upper alarm
limit
Exceeding this limit causes an
alarm.
Max. floating
point value
[m/s2]
(8564)
- Read /
write
7538 Float / 4 Upper warning
limit
Exceeding this limit causes a
warning.
Max. floating
point value
[m/s2]
(8564)
- Read /
write
7542 Float / 4 Hysteresis Hysteresis that affects the alarm
and warning limits.
0.0
[m/s2]
(8564)
- Read /
write
1876 unsigned / 2 ROC time inter‐
val
Time interval for Rate Of
Change calculation
10
[s]
1 - 300 Read /
write
A.9.4.3 Totalizers
Totalizer 1 settings
Table A-46 Totalizer 1 settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
8305 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
8302 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
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 193