Yokogawa EJX930A - Manual (Page 46)

<6. Explanation of Basic Items>
6-7
IM 01C25R03-01E
6.3.8 Functions Relating to Flange
Temperature (option code: /DG1)
Flange temperature value reference:
In FLG_TEMP_VAL, it is possible to refer to
the flange 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 FLG_TEMP_VAL is
selected. The status is normally Good-Non Specific.
However, it turns to Bad or Uncertain when sensor
failure happens. For specifics, refer to Table
8.9. For details of Flange Temperature, refer to
APPENDIX 8.3.
6.3.9 BLOCK_ERR
BLOCK_ERR presents the cause of an error in the
block. The SENSOR transducer block checks the
following causes and sets the relevant bits.
BLOCK_ERR
Bit Error Cause
0 Other Differential pressure adjusted
by zero/span adjustment out
of measurement range, Static
pressure adjusted by zero/span
adjustment out of measurement
range Pressure sensor failure,
Capsule temperature sensor
failure Electronic circuit failure
15 Out of Service MODE_BLK.Target is O/S
6.3.10 XD_ERROR
XD_ERROR is a parameter that contains codes
for the most significant errors that can occur in the
SENSOR transducer block. The errors of XD_
ERROR supported by EJX multivariable transmitter
and their causes are presented in the table below.
When multiple errors occur and their error codes
are different, the error with a larger code value is
stored first.
XD_ERROR
Bit Error Cause
15 Out of Service Sensor TB is in O/S mode.
18 Calibration
error
An error occurred during
calibration or a calibration error
has been detected.
20 Electronics
Failure
An electronic component has
failed.
22 I/O Failure An I/O failure has occurred.
6.4 FLOW Transducer Block
6.4.1 Outline of the Functions
The differential pressure, static pressure and
external temperature signal calculated in the
SENSOR transducer block are input to this block,
and the flow calculation is performed based
on these signals. The result undergoes output
processing (e.g. damping), and the flow signal is
output to the AI function block.
6.4.2 Block Mode
The Block modes permitted for the FLOW
transducer block are Automatic (Auto) and Out
of Service (O/S). Note that the Automatic mode
cannot be set when option code A (Multi Sensing) is
selected in the measurement function.
For normal operation, select the Automatic mode.
To change important parameters, the O/S mode
must be selected. For details on how to identify
parameters that can be changed in the Automatic
mode and parameters that can be changed only in
the O/S mode, see chapter 9. Parameter Lists.
6.4.3 Calculation of the Flow
The calculated flow value and status are stored
to the FLOW_VALUE parameter. For details
on the flow calculation, refer to EJX910A and
EJX930A Multivariable Transmitters User's Manual
(IM 01C25R01-01E). The update period of the
flow calculation is 200 mseconds, and the flow
calculation is not updated when the operation mode
is O/S. Note that the Automatic mode cannot be
set when option code A (Multi Sensing) is selected
in the measurement function. There are two flow
calculation modes: Auto Compensation mode and
Basic mode. When flow calculation is performed
in the Auto Compensation mode, the calculation
coefficient must be calculated by the dedicated
setup tool and downloaded to the transmitter. For
details on this method, refer to the User's Manual
(IM 01C25R51-01E) for the dedicated setup tool.
The procedure for setting the BASIC Mode is as
follows. For details on how to calculate the Kfactor,
refer to the EJX910A and EJX930A Multivariable
Transmitters User's Manual (IM 01C25R01-01E).