Siemens SITRANS F Series, Operating Instructions Manual, Page: 235 / 362

Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
Operating Instructions, 08/2017, A5E37367739-AC
233
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
9267 Float / 4 Amount of
standard vol-
ume
Amount value to gen-
erate an output pulse.
Applicable if process
value (9260) is set to
27.
1.0
[Sl]
(8994)
- Read /
write
10155 Unsigned / 2 Pulses per
amount
Number of pulses
which will be output
when configured
amount is reached.
1 - Read /
write
9274 Float / 4 Pulse width Pulse duration. 0.1
[s]
0.00004 - 4.0 Read /
write
9277 Unsigned / 2 Polarity Logical polarity of
pulse output.
0
•
0: Active high level
•
1: Active low level
Read /
write
9591 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
9281 Unsigned / 2 Fail-safe min.
time
Minimum time the
output stays in fail-safe
behavior.
0
[s]
0 - 100 Read /
write
9261 Unsigned / 2 Fail-safe behav-
ior
Pulse output reaction
in case of a fault.
Only applicable if Re-
dundancy mode (9280)
= 0.
0
• 0: Last valid value
•
1: Hold. Value 0.0
substitutes the actual
input value
• 2: Disabled
•
3: Custom value
Read /
write
7431 Float / 4 Fail-safe value Output value in case of
a fault and when Fail-
safe behavior (9261) is
configured to 4.
0.0
[pulses/s]
0.0 - 12500.0 Read /
write
7158 Float / 4 Forced value Forced value when
forcing is active.
1.0
[pulses/s]
0.0 - 12500.0 Read /
write