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Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
258
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
9477
Unsigned / 2 Polarity
Logical polarity of
pulse output.
0
•
0: Active high level
•
1: Active low level
Read /
write
9592
Unsigned / 2 Fail-safe activa-
tion condition
Fail safe activation
condition.
1
•
0: Bad status of se-
lected process value
•
1: Active Mainte-
nance alarm or Fail-
ure (NAMUR)
Read /
write
9481
Unsigned / 2 Fail-safe min.
time
Minimum time the
output stays in Fail-
safe behavior.
0
[s]
0 - 100
Read /
write
9461
Unsigned / 2 Fail-safe behav-
ior
Pulse output reaction
in case of a fault.
0
•
0: Last valid value
•
1: Hold. Value 0.0
substitutes the actual
input value
•
2: Disabled
•
3: Custom value
Read /
write
7441
Float / 4
Fail-safe value Output value in case of
a fault and when Fail-
safe behavior (9461) is
configured to 4.
0.0
[pulses/s]
0.0 - 12500.0
Read /
write
7165
Float / 4
Forced value
Forced value when
forcing is active.
1.0
[pulses/s]
0.0 - 12500.0
Read /
write