Siemens SITRANS FST030 - Page 185

Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
7954 Float / 4 Upper warning
limit
Exceeding this limit
causes a warning.
max. stand‐
ard volume
flow
[Sm
3
/h]
(7964)
-max. standard volume
flow -
+max. standard volume
flow
Read /
write
7956 Float / 4 Lower warning
limit
Falling below this limit
causes a warning.
-max. stand‐
ard volume
flow
[Sm
3
/h]
(7964)
-max. standard volume
flow -
+max. standard volume
flow
Read /
write
7958 Float / 4 Lower alarm
limit
Falling below this limit
causes an alarm.
-max. stand‐
ard volume
flow
[Sm
3
/h]
(7964)
-max. standard volume
flow -
+max. standard volume
flow
Read /
write
7965 Float / 4 Hysteresis Hysteresis that affects
the alarm and warning
limits.
0
[Sm
3
/h]
(7964)
0 - max. standard volume
flow
Read /
write
Flow velocity settings
Table A-32 Flow velocity settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
7644 Float / 4 Low flow cut-off Flow velocity limit for
low flow cut-off. Below
limit flow velocity out‐
put is forced to zero.
0.0
[m/s]
(8014)
- Read /
write
7634 Float / 4 Upper alarm
limit
Exceeding this limit
causes an alarm.
Max. floating
point value
[m/s]
(8014)
- Read /
write
7636 Float / 4 Upper warning
limit
Exceeding this limit
causes a warning.
Max. floating
point value
[m/s]
(8014)
- Read /
write
7638 Float / 4 Lower warning
limit
Falling below this limit
causes a warning.
Min. floating
point value
[m/s]
(8014)
- Read /
write
7640 Float / 4 Lower alarm
limit
Falling below this limit
causes an alarm.
Min. floating
point value
[m/s]
(8014)
- Read /
write
7642 Float / 4 Hysteresis Hysteresis that affects
the alarm and warning
limits.
0.0
[m/s]
(8014)
- Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 185