A5.2 Input Process Section; A5.2.1 Determining Input Value Statuses; A5.2.2 Converting The Rate - YOKOGAWA digitalYEWFLO Series User Manual

A5.2 Input Process Section

When executed, the Integrator block first performs
input processing in the order of:
"Determining input status" → "Converting Rate or
Accum" → "Determining the input flow direction"
Switching between Convert Rate and Convert
Accum is made using bit 0 (for IN_1) or bit 1 (for
IN_2) of INTEG_OPTS. INTEG_OPTS is one of the
system parameters and should be set by the user.
The values of IN_1 and IN_2 are not retained if the
power is turned OFF.

A5.2.1 Determining Input Value Statuses

The following shows the correlation between the statuses of input parameters (IN_1, IN_2) and the statuses of
input values used in the Integrator block.
Statuses of Input Bit 4 of INTEG_OPTS
Parameters (IN_1, IN_2)
Good Irrelevant
Bad Irrelevant
Bad Irrelevant
Uncertain H (=1)
Uncertain L (=0)
For addition (Read APPENDIX 5.3 "Adder"), if the status of an input value is "Bad," the "Good" value just before
the status changed to "Bad" is used.
* Even if the Use Bad option is used, changing the internal status to "Good," the value of "Good" just before the
status changed to "Bad" is used.

A5.2.2 Converting the Rate

The following describes an example of rate
conversion.
In rate conversion, firstly convert the unit of two
inputs to that based on seconds.
Converts the unit into
that based on seconds
TIME_UNIT1
sec:÷1
input1
min:÷60
kg/hour
hour:÷3600
day:÷86400
Converts the unit into
that based on seconds
TIME_UNIT2
sec:÷1
input2
min:÷60
lb/min
hour:÷3600
lb: pounds
day:÷86400
Bit 5* of INTEG_OPTS
(Use Uncertain) (Use Bad)
Irrelevant
H (=1)
L (=0)
Irrelevant
Irrelevant
kg/s
Standardizes the unit of
IN_2 to that of IN_1.
Because "lb/s" is converted into
"kg/s" in this example, the input
2 value is multiplied by 0.453.
(1 lb = 0.453 kg)
UNIT_CONV
x [conversion factor]
(Conversion factor:
lb/s
0.453 in this example)
Figure A5.2 Increment Calculation with Rate Input
<APPENDIX 5. INTEGRATOR (IT) BLOCK>
Status of Input Values
Handled in IT Block
Good
Good
Bad
Good
Bad
Next, convert the unit of the inputs to the same
unit to be added together. The unit of IN_2 is
standardized to that of IN_1. Then, calculates a
weight, volume, or energy by multiplying each
input value and block execution time. Because unit
information is not input to the Integrator block as an
input value, the user must input in advance tuned
values to the TIME_UNIT1/2 and UNIT_CONV
parameters.
× block execution time
× block execution time
kg/s
A5-2
increment1
kg
increment2
kg
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