Siemens SITRANS F Series, Руководство по эксплуатации, Страница: 160 / 362

Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
158
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
1719 Float / 4 Calibration
reference pres-
sure
Setup parameter for
specifying the process
pressure at which the
flow calibration of the
meter is performed.
The value is used for
compensation of pipe
expansion due to pres-
sure.
700000.0
[Pa]
(8015)
0.0 - 100000000.0 Read /
write
1721 Float / 4 Pipe modulus
elasticity
Setup parameter for
specifying the pipe
material modulus of
expansion. The value
is used for compensa-
tion of pipe expansion
due to pressure.
200.0E+9
[Pa]
(8015)
1.0E+6 - 1.0E+12 Read /
write
Upstream and downstream conditions
Table A- 16 Upstream and downstream conditions
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
1220 Unsigned / 2 Upstream pipe
geometry
Compensation for
upstream pipe geome-
try.
0
• 0: Straight run
•
1: Single elbow
• 2: Double elbow (in-
plane)
•
3: Double elbow (out-
of-plane)
• 4: Reducer
•
5: Expansion
Read /
write
1221 Unsigned / 2 Upstream dis-
tance
The distance to the
upstream flow disturb-
ance in multiples of
inner pipe diameter.
0 0 - 40 Read /
write