<4. Diagnostics >
4-4
IM 01C50T01-02EN
Table 4.2
Output Operation
Current output
mapping
Sensor1 Failure
Sensor2 Failure Sensor1 Short
*3
Sensor2 Short
*3
Terminal Sensor
Fail
*4
SENS.1
Sensor Burnout
*1
Sensor Burnout
*1
*1
S.1-TER
Sensor Burnout
*1
Sensor Burnout
*1
Sensor Burnout
TERM
*1
*1
*1
*1
Sensor Burnout
SENS.2
*1
Sensor Burnout
*1
Sensor Burnout
*1
S.2-TER
*1
Sensor Burnout
*1
Sensor Burnout
Sensor Burnout
S.1-S.2
Sensor Burnout
Sensor Burnout
Sensor Burnout
Sensor Burnout
*1
S.2-S.1
Sensor Burnout
Sensor Burnout
Sensor Burnout
Sensor Burnout
*1
AVG
Sensor Burnout
Sensor Burnout
Sensor Burnout
Sensor Burnout
*1
BACKUP
*2
*2
*2
*2
*1
*1:
Continue to operate and output.
*2: When both sensor1 and sensor2 occur error, output is burnout.
*3:
Applicable only for YTA710.
*4: In software revision R1.03.01 or earlier, the output is held at the value immediately before the alarm occurs.
4.2 Logging Functions
The YTA series have the capability to store the data
useful for diagnosis of the problems.
(1) Alarm log
Up to four alarm histories are stored in the
transmitter memory, and can be seen using the
following procedures.
Call up the display: Device setup → Diag/Service →
Status Log
(2) Max/Min log
Minimum value and Maximum value of the process
variables are stored in the transmitter memory and
can be checked.
a) Procedure to call up the display
Device setup → Diag/Service → Sensor Max/
Min Log
b) To clear the logged data for Process variables
except Term variables, select reset Sns Max/
Min.
NOTE
These values may become big by disconnection
of the sensor, etc. Please reset in this case.
(3) Operation Time
Transmitter’s operation time from the first power-on
is counted. Call up the “Operation Time” display to
check the time.
Device setup → Detailed setup → Device
information → Date & Time → Operation Time
NOTE
Operation Time is saved every 15 minutes.
4.3 Diagnostics Function
The YTA has the following diagnostic functions.
(1) Hardware Failure
This function detects Failures of CPU, AD
converter, memory, etc.
(2) Sensor Failure
This function detects any disconnection of sensors.
When the current is applied and the resistance of a
sensor is above the threshold, the function outputs
a disconnection alarm.
Parameter setting: Not necessary
Alarm output: When the resistance is above the
threshold, the function outputs the alarm of
Sensor1 Failure (AL.10) or Sensor2 Failure
(AL.11).
(3) Terminal block Failure
This function detects any disconnection at CJC.
When it detects that the resistance of CJC is above
the threshold, the function outputs an alarm.
Parameter setting: Not necessary
Alarm output: When the resistance is above the
threshold, the function outputs the alarm of
Terminal Sensor Fail (AL.22).
