
Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
190
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
11544
Float / 4
Lower warning
limit
Falling below this limit
causes a warning.
Min. floating
point value
[SGU]
-
Read /
write
11546
Float / 4
Lower alarm
limit
Falling below this limit
causes an alarm.
Min. floating
point value
[SGU]
-
Read /
write
11548
Float / 4
Hysteresis
Hysteresis that affects
the alarm and warning
limits.
0.0
[SGU]
-
Read /
write
Standard specific gravity settings
Table A- 44 Standard specific gravity settings (only hydrocarbon applications)
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
11550
Float / 4
Upper alarm
limit
Exceeding this limit
causes an alarm.
Max. floating
point value
[SGU]
-
Read /
write
11552
Float / 4
Upper warning
limit
Exceeding this limit
causes a warning.
Max. floating
point value
[SGU]
-
Read /
write
11554
Float / 4
Lower warning
limit
Falling below this limit
causes a warning.
Min. floating
point value
[SGU]
-
Read /
write
11556
Float / 4
Lower alarm
limit
Falling below this limit
causes an alarm.
Min. floating
point value
[SGU]
-
Read /
write
11558
Float / 4
Hysteresis
Hysteresis that affects
the alarm and warning
limits.
0.0
[SGU]
-
Read /
write