Yokogawa EJA115 - Manual (Page 45)

IM 01C22T02-01E A-7
APPENDIX 2. APPLICATION, SETTING AND CHANGE OF BASIC PARAMETERS
APPENDIX 2. APPLICATION, SETTING
AND CHANGE OF BASIC
PARAMETERS
A2.1 Applications and Selection of Basic Parameters
Setting Item (applicable parameters) Summary
Tag No.
(PD_TAG) Sets PD Tag and each block tag.
Up to 32 alphanumeric characters can be set for both tags.
Refer to “Tag and address” in Section 5.4.
Calibration range setup
(XD_SCALE) Sets the range of input from the transducer block corresponding to the 0% and 100%
points in operation within the AI1 function block. The calibrated range (0% and 100%) is
the factory default setting.
Sets the range unit, input value of the 0% point (lower range limit), input value of the 100%
point (higher range limit), and the 4 data at the decimal point.
Output mode setup
(L_TYPE) Selects the operation function of the AI function block. It may be chosen from among
Direct, Indirect, and IndirectSQRT.
The output of the transducer block is directly output only via filtering without
scaling and square root extraction.
Output processed by proportion at the AI function block.
Output processed by square root extraction at the AI function block.
Output scale setup
(OUT_SCALE) Sets the scale of output corresponding to the 0% and 100% points in operation within the
AI1 function block. It is possible to set a unit and scale that differs from the calibration
range.
Sets the range unit, input value of the 0% point (lower bound of output scale), input value
of the 100% point (upper bound of output scale), and the 4 data at the decimal point.
Scale range and unit of built-in
indicator setup
(OUT_SCALE) The range determined with the output scale becomes the scale and unit of the built-in
indicator.
Note: If a built-in indicator is available, the lower bound and the upper bound of the range
(numeric string excluding the decimal point if it is included) may be set in a range
from -19999 to 19999. Down to the third decimal position can be set.
Simulation setup
(SIMULATE) Performs simulation of the AI function block.
The input value and status for the calibration range can also be set.
It is recommended that this parameter be used for loop checks and other purposes. Refer
to “Simulation Function” in Section 6.3.
Output signal low cut mode setup
(LOW_CUT) If the output falls below the setting of this parameter, the output is set to Zero. It can be
set individually with Direct, Indirect, and IndirectSQRT.
Damping time constant setup
(PV_FTIME) Sets the time constant of the damping (primary delay) function in the AI function block in
seconds.
Static pressure Sets the static pressure to be processed by the AI2 function block.
Temperature unit setup
(TERTIARY_VALUE_UNIT) Sets the temperature unit.
LCD display setup
(DISPLAY_MODE,
DISPLAY_CYCLE) Sets the unit to be displayed on the LCD and the display speed.
Adjust display speed if a low temperature environment causes a poor LCD display quality.
Range change (while applying actual
inputs)
(CAL_POINT_HI, CAL_POINT_LO) Sets the range corresponding to the 0% and 100% points while adding the real input. It is
possible to set output to correctly match the user’s reference device output.
Zero-point adjustment
(TRIM_PV_ZERO,
EXT_ZERO_ENABLE) Performs zero-point adjustment.
There are two methods for adjustment, (1) using an external zero-point adjustment screw,
and (2) by using the parameter of the transducer block.
TA0201.EPS
Direct:
Indirect:
IndirectSQRT: