YOKOGAWA YTA710, User Manual

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<4. Self-Diagnostics>
4-4
IM 01C50T03-02EN
The sensor burnout conditions depend on the setting of current output mapping, and the alarm occurred.
These conditions are as follows.
Table 4.2 Output Operations
Current
output
mapping
S1 Failure S2 Failure S1 Short S2 Short Term Sensor Fail
SENS.1 Sensor burnout Normal operation Sensor burnout Normal operation Normal operation
S.1-TER Sensor burnout Normal operation Sensor burnout Normal operation Sensor burnout
TERM Normal operation Normal operation Normal operation Normal operation Sensor burnout
SENS.2 Normal operation Sensor burnout Normal operation Sensor burnout Normal operation
S.2-TER Normal operation Sensor burnout Normal operation Sensor burnout Sensor burnout
S.1-S.2 Sensor burnout Sensor burnout Sensor burnout Sensor burnout Normal operation
S.2-S.1 Sensor burnout Sensor burnout Sensor burnout Sensor burnout Normal operation
AVG Sensor burnout Sensor burnout Sensor burnout Sensor burnout Normal operation
BACKUP *1 *1 *1 *1 Normal operation
*1: If both Sensor1 and Sensor2 have failed, a Sensor Burnout is output
NOTE
While the Sensor Backup function is active, if both
AL.23 Backup S1 Fail and AL.24 Backup S2 Fail
occur, sensor burnout will occur. For details about
sensor backup refer to Section 3.2.14 "Sensor
Backup Function".
IMPORTANT
If S1 Failure, S2 Failure, S1 Short, S2 Short, Term
Sensor Fail, Backup S1 Fail, and Backup S2 Fail
are masked, the sensor burnout due to these
events is also suppressed.
If it is necessary for the sensor burnout event to
occur, release the alarm mask (NOMASK setting).
4.2 History Functions
The YTA710 temperature transmitter has the
following history functions.
(1) Alarm history
(1) Number of history records
Up to 59 history records are stored in the
temperature transmitter memory, and any five
of them can be referred to simultaneously.
If more than 59 records are stored, history
records will be deleted in order starting from the
oldest and overwritten by new history records.
(2) History data buffer
The same 59 history records are held in the
buffer that is constantly updated and in the
parameter display buffer of the temperature
transmitter.
Before displaying the parameters, synchronize
the parameter display buffer with the buffer that
is constantly updated. Then, update them to the
latest information.
Execute the following parameters to
synchronize the data.
Parameter Option Remarks
P18:AL LOG
UPD
NO
EXEC
Nothing occurs even if this
value is written. In normal
circumstances, this value is
displayed.
EXEC When this value is written,
the buffers are synchronized
explicitly.
When synchronization has
finished, the system returns
to the NO EXEC state
automatically.