Siemens SITRANS F Series, Руководство по эксплуатации, Страница: 215 / 362

Modbus communication
A.9 Modbus holding registers tables
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
Operating Instructions, 08/2017, A5E37367739-AC
213
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
8961 Unsigned / 2 Fail-safe behav-
ior
Pulse output reaction
in case of a fault.
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
Read /
write
7421 Float / 4 Fail-safe value Output value in case of
a fault and when Fail-
safe behavior (8939) is
configured to 4.
0.0
[pulses/s]
0.0 - 12500.0 Read /
write
7151 Float / 4 Forced value Forced value when
forcing is active.
1.0
[pulses/s]
0.0 - 12500.0 Read /
write
Channel 2 status output settings
Table A- 52 Channel 2 status output settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units regis-
ter)
Value range /
Setting options
Access
level
8841 Unsigned / 2 Status mode Select the functionality
for the status output.
0
• 0: Alarm class
•
1: Alarm item
Read /
write
8858 Unsigned / 2 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.
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)
Read /
write