Siemens SITRANS FST030 - Page 214

Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
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-53 Channel 2 status output settings
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
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 293).
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
8899 Unsigned / 2 NAMUR status
signals
Bit encoded selection
of NAMUR status sig‐
nals which impacts the
status output.
Applicable if Status
mode = 0. NAMUR sta‐
tus is derived from
Alarm class (8858).
0
● Bit 0: Out of
specification (PA,
PW)
● Bit 1: Failure (MA)
● Bit 2: Maintenance
required (MR, MD)
● Bit 3: Function check
(FC)
Read /
write
8842 Unsigned / 4 Alarm items 1 Bit encoded selection
of alarm items that im‐
pact the output. Mainly
sensor alarms.
See Alarm items
(Page 293). Applicable
if Status mode = 1.
0 Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
214 Operating Instructions, 08/2018, A5E37367739-AD