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TTH300
HEAD-MOUNT TEMPERATURE TRANSMITTER | OI/TTH300-EN REV. G
… 4 Design and function
… Input functionality
Redundancy behavior
Output behavior (behavior of the
current output)
Current output assignment to
be set (Tools: “HART Mapping”)
Redundancy configuration to be
set (Tools: “Parameter setting”)
Diagnostic message to be set
according to NAMUR NE 107
Increased availability
(Switchover for defective
sensor)
Normal operation:
Output signal follows sensor 1
Sensor 1 defective: Switching
seamlessly (with smooth transition)
to sensor 2. Output signal remains
valid.
Sensor 1 and sensor 2 defective:
output of set alarm current
“Redundancy”
“Availability”
Redundancy, S1 not available:
“Maintenance Required”
Redundancy, S2 not available:
“Maintenance Required”
Sensor drift detected:
“Maintenance Required”
Increased safety (use of
drift detection)
Normal operation:
Output signal follows sensor 1
Sensor 1 or sensor 2 defective:
output of set alarm current
Sensor drift detected: output of set
alarm current
“Redundancy”
“Safety”
Redundancy, S1 not available:
“Failure”
Redundancy, S2 not available:
“Failure”
Sensor drift detected: “Failure”
Increased accuracy
(through averaging)
Output signal follows the
arithmetic mean value of sensor 1
and sensor 2
Sensor 1 or sensor 2 defective:
output of set alarm current
“Mean value”
not relevant
Redundancy, S1 not available:
“Failure”
Redundancy, S2 not available:
“Failure”
Sensor drift detected:
“Maintenance Required”
Corresponding diagnostic messages are available via DTM, EDD, FDI package (FIM) or on the LCD display.
For the meaning of the diagnostic messages according to NAMUR 107, see
Possible error messages – HART® devices from
SW-Rev. 3.00
on page 70. The error messages and options for error correction are listed in
Possible error messages – HART® devices
from SW-Rev. 3.00
on page 70.
Note
Only the current output behavior and redundancy configuration can be set for the three redundancy behaviors via the HMI LCD
display with configuration function. The diagnostic messages according to NAMUR NE 107 can only be changed over in the tools and
remain in the default setting ex works (“Maintenance Required”).
