Yokogawa EJX930A - Manual (Page 45)

<6. Explanation of Basic Items>
6-6
IM 01C25R03-01E
A preset fixed value can be output to the AI function
block or FLOW transducer block instead of the
differential pressure value, static pressure value
and external temperature value calculated from the
sensor signals.
Select the signal for enabling simulation in the
SIMULATE_MODE parameter. Set the value and
status to be used for simulation in the SIMULATE_
DPRESS, SIMULATE_SPRESS, and SIMULATE_
ETEMP parameters.
Parameter Explanation
SIMULATE_
MODE Select the signal for enabling simulation.
0= Simulation OFF
1= Differential pressure signal
simulation ON
2= Static pressure signal simulation ON
3= Differential pressure signal + static
pressure signal simulation ON
4= External temperature signal
simulation ON
5= Differential pressure signal +
external temperature signal simulation
ON
6= Static pressure signal + external
temperature signal simulation ON
7= Differential pressure signal +
static pressure signal + external
temperature signal simulation ON
15=Differential pressure signal +
static pressure signal + external
temperature signal (w/out damping
processing) simulation ON
SIMULATE_
DPRESS Set the differential pressure signal
simulation value and status.
SIMULATE_
SPRESS Set the static pressure signal simulation
value and status.
SIMULATE_
ETEMP Set the external temperature signal
simulation value and status.
The flow value becomes the simulation value
which is calculated by using simulation value of
DP, SP and ET. The LCD continuously displays the
simulation value and alarm (AL.080 SNR.SIM) in
alternating sequence.
Simulation continues for 10 minutes, then is
released automaticaly.
If one of following alarm occurs, all the output data
is hold to the value before alarm occurs.
AL.01 (CAP. ERR)
AL.02 (AMP. ERR)
AL.03 (ET. ERR)
The simulation mode will automatically be released
after approximately ten minutes.
NOTE
If the DP or SP simulation value set by a user is
out of the setting range of the product(capsule),
the transmitter automatically use maximum or
minimum settable value in place of actual setting
value to perform simulation.
If the ET simulation value set by a user is out of
the setting range, a configuration error occurs.
6.3.7 Functions Relating to Capsule and
Amplifier Temperature
Reference to capsule and amplifier temperature
value:
In CAP_TEMP_VAL and AMP_TEMP_VAL, it
is possible to refer to the capsule and amplifier
temperature value and status. The update period
of this value is about 1 second. The temperature
unit is selected by XD_SCALE.unit of the AI block,
in which CAP_TEMP_VAL is selected. The status
is normally Good-Non Specific. However, in the
case of sensor failure or out of measurement range,
it turns to Bad or Uncertain. For specifics, refer to
Table 8.9.
Determination of the range limit of capsule
temperature:
The range of capsule temperature is from -40 to
120°C. When the measured capsule temperature
deviates from -50 to 130°C range, set the status of
CAP_TEMP_VAL to Uncertain-Sensor Conversion
not Accurate. The status under normal conditions
is Good-Non Specific. Also, set the status of
PRIMARY_VALUE, SECONDARY_VALUE and
TERTIARY_VALUE TO Uncertain-Subnormal.
Determination of the range limit of amplifier
temperature:
The range of amplifier temperature is from -40 to
120°C. When the measured amplifier temperature
deviates from -50 to 95°C range, set the status of
AMP_TEMP_VAL to Uncertain-Sensor Conversion
not Accurate. The status under normal conditions is
Good-Non Specific.