Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[unit]
(unit register)
Value range /
Setting options
Access
level
6624 Unsigned / 2 Alarm ID Alarm ID of the entry
specified by Entry num‐
ber. See Alarm items
(Page 293).
65335 specifies an
empty entry that can be
ignored.
- - Read
only
6625 Unsigned / 2 Alarm class Alarm class of the entry
specified by Entry num‐
ber. See Alarm items
(Page 293).
65335 specifies an
empty entry that can be
ignored.
-
● 1: Process value
alarm (PA)
● 2: Process value
warning (PW)
● 4: Maintenance alarm
(MA)
● 8: Maintenance
warning (MW)
● 16: Maintenance
required (MR)
● 32: Function check
(FC)
Read
only
6638 Unsigned / 2 Available en‐
tries
Current number of
available diagnostic log
entries.
- - Read
only
6601 Unsigned / 2 Reset log Command to clear the
alarm history log.
-
● 0: Cancel
● 1: Clear log
Write on‐
ly
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
292 Operating Instructions, 08/2018, A5E37367739-AD