IM 01C25R03-01E
6-6
6. EXPLANATION OF BASIC ITEMS
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.
6.3.8 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
T0601.EPS
Bit
Error
Cause
0
15
Out-of-Service
MODE_BLK.Target is O/S
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
6.3.9 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
EJX910A 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
T0602.EPS
Bit
Error
Cause
22
I/O Failure
An I/O failure has occurred.
15
Out of Service Sensor TB is in O/S mode.
20
Electronics
Failure
An electronic component has failed.
18
Calibration
error
An error occurred during calibration or a
calibration error has been detected.
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 trans-
ducer 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 Multivariable Transmit-
ters User's Manual (IM 01C25R01-01E). The update
period of the flow calculation is 200 msec, 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 calcula-
tion 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 down-
loaded to EJX910A. 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 Multivariable Transmitters User's
Manual (IM 01C25R01-01E).
BASIC Mode Setting Procedure
(1) Set the operation mode to O/S.
(2) Select easy flow calculation at
FLOW_CALCULATION_MODE.
(3) Select the fluid code (liquid or gas) at
FLUID_TYPE_CODE.
(4) Select the flow equation in the following table
from the fluid type (liquid/gas) and flow unit
category (mass flow/standard volume flow/
volume flow).
T0602a.EPS
Fluid
type
Flow unit
Category
Flow equation
Liquid Mass Flow
Normal-Standard
Volume Flow
Volume Flow
Qm or Qv or Qv norm
*1
=Kfactor
P
(1
Temp K1
(T-Tb))
Gas
Mass Flow
Normal-Standard
Volume Flow
Volume Flow
Qv=Kfactor
*1
P
T/Tb
SPb/SP
Qm or Qv norm
*1
=Kfactor
P
Tb/T
SP/SPb
*1 Custom setting Parameter
(5) Set the required data (values marked by ====
in the above table) to the following parameters.
• Kfactor
→
FIXED_FLOW_VALUE
