ABB TTH300 Operating Instruction page 16

16 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)
Increased availability
Normal operation:
(Switchover for defective
Output signal follows sensor 1
sensor)
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
Increased safety (use of Normal operation:
drift detection) Output signal follows sensor 1
Sensor 1 or sensor 2 defective:
output of set alarm current
Sensor drift detected: output of set
alarm current
Increased accuracy Output signal follows the
(through averaging) arithmetic mean value of sensor 1
and sensor 2
Sensor 1 or sensor 2 defective:
output of set alarm current
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").
Current output assignment to
be set (Tools: "HART Mapping")
"Redundancy"
"Redundancy"
"Mean value"
Redundancy configuration to be
set (Tools: "Parameter setting")
"Availability"
"Safety"
not relevant
Diagnostic message to be set
according to NAMUR NE 107
Redundancy, S1 not available:
"Maintenance Required"
Redundancy, S2 not available:
"Maintenance Required"
Sensor drift detected:
"Maintenance Required"
Redundancy, S1 not available:
"Failure"
Redundancy, S2 not available:
"Failure"
Sensor drift detected: "Failure"
Redundancy, S1 not available:
"Failure"
Redundancy, S2 not available:
"Failure"
Sensor drift detected:
"Maintenance Required"