Siemens SITRANS FST030 - Page 158

Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
9494 Unsigned / 2 Standard vol‐
ume units CH4
Units for
standard
volume
quantities
related to
CH4.
171
● 166: Nm³ (normal cubic meters)
● 167: Nl (normal liters)
● 168: Sft³ (standard cubic feet)
● 171: Sl (standard liters)172: Sm³
(standard cubic meters)
Read /
write
8470 String / 8 Custom volume
flow units string
User specif‐
ic string for
volume
flow values.
-------- - Read /
write
8468 Float / 4 Custom volume
flow units factor
Conversion
factor for
user specif‐
ic volume
flow values
related to
m
3
/s.
1.0 - Read /
write
7518 String / 8 Custom stand‐
ard volume flow
units string
User specif‐
ic string for
standard
volume
flow values.
-------- - Read /
write
7516 Float / 4 Custom stand‐
ard volume flow
units factor
Conversion
factor for
user specif‐
ic standard
volume
flow values
related to
Sm
3
/s.
1.0 - Read /
write
8458 String / 8 Custom mass
flow units string
User specif‐
ic string for
mass flow
values.
-------- - Read /
write
8456 Float / 4 Custom mass
flow units factor
Conversion
factor for
user specif‐
ic mass
flow values
related to
kg/s.
1.0 - Read /
write
8464 String / 8 Custom density
units string
User specif‐
ic string for
density val‐
ues.
-------- - Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
158 Operating Instructions, 08/2018, A5E37367739-AD