Siemens SITRANS F series Operating Instructions Manual page 215

Modbus Data type /
register Size in bytes
8961 Unsigned / 2
7421 Float / 4
7151 Float / 4
Channel 2 status output settings
Table A- 52 Channel 2 status output settings
Modbus Data type /
register Size in bytes
8841 Unsigned / 2
8858 Unsigned / 2
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
Operating Instructions, 08/2017, A5E37367739-AC
Parameter Description
Fail-safe behav- Pulse output reaction
ior in case of a fault.
Fail-safe value Output value in case of
a fault and when Fail-
safe behavior (8939) is
configured to 4.
Forced value Forced value when
forcing is active.
Parameter Description
Status mode Select the functionality
for the status output.
Alarm class Bit encoded selection
of alarm classes which
impact the status out-
put. Each diagnostic
event is allocated to an
alarm class. See Alarm
items (Page 295).
Applicable if Status
mode = 0.
A.9 Modbus holding registers tables
Default value Value range /
[units] Setting options
(units regis-
ter)
2
0: Last valid value
•
1: Hold. Value 0.0
•
substitutes the actual
input value
2: Disabled
•
3: Custom value
•
4: Maximum pulses/s
•
on CH2 and no puls-
es on CH3. Only if
CH3 is configured to
redundancy mode
0.0 0.0 - 12500.0
[pulses/s]
1.0 0.0 - 12500.0
[pulses/s]
Default value Value range /
[units] Setting options
(units regis-
ter)
0
0: Alarm class
•
1: Alarm item
•
0
Bit 0: Process value
•
alarm (PA)
Bit 1: Process value
•
warning (PW)
Bit 2: Maintenance
•
alarm (MA)
Bit 3: Maintenance
•
warning (MW)
Bit 4: Maintenance
•
required (MR)
Bit 5: Function check
•
(FC)
Modbus communication
Access
level
Read /
write
Read /
write
Read /
write
Access
level
Read /
write
Read /
write
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