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Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
306
Operating Instructions, 08/2017, A5E37367739-AC
Modbus
register
Data type /
Size in bytes
Parameter
Description
Default value
[unit]
(unit register)
Value range /
Setting options
Access
level
3554
Float / 4
SNR upstream
path 4
Signal to noise ration
of upstream signal
-
-
Read
only
3556
Float / 4
SNR down-
stream path 4
Signal to noise ration
of downstream signal
-
-
Read
only
3558
Float / 4
Sound velocity
path 4
Sound velocity
-
-
Read
only
3560
Float / 4
Flow velocity
path 4
Flow velocity
-
-
Read
only
3562
Float / 4
Delta time path
4
Delta time
-
-
Read
only
3564
Float / 4
Travel time up
path 4
Travel time of up-
stream signal
-
-
Read
only
3566
Float / 4
Travel time
down path 4
Travel time of down-
stream signal
-
-
Read
only
3568
Float / 4
Correlation
factor path 4
Correlation factor
-
-
Read
only
3574
Unsigned / 2 Accepted burst
percentage
path 4
% of bursts accepted
(path 4).
Based on various di-
agnostic input (i.e.
correlation strength,
gain level, SNR, etc.)
the meter may reject
specific up/down re-
ceived sets or bursts.
The percentage of
accepted bursts is one
measure of the appli-
cation’s health.
-
-
Read
only
3575
Float / 4
Actual sensor
frequency path
4
Sensor frequency
-
-
Read
only
3579
Float / 4
Upstream peak
amplitude path
4
Upstream signal peak
amplitude
-
-
Read
only
3577
Float / 4
Downstream
peak amplitude
path 4
Downstream signal
peak amplitude
-
-
Read
only
3581
Float / 4
Fluid refraction
angle path 4
Calculated fluid refrac-
tion angle on path 4
(clamp-on only).
-
-
Read
only