Yokogawa AXFA14G/C - Manual (Page 66)

IM 01E20F02-01E A-7
APPENDIX 2. INTEGRATOR (IT) BLOCK
A2.2 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.
A2.2.1 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
Parameters (IN_1, IN_2) Bit 4 of INTEG_OPTS
(Use Uncertain) Bit 5* of INTEG_OPTS
(Use Bad) Status of Input Values
Handled in IT Block
Good Irrelevant Irrelevant Good
Bad Irrelevant H (=1) Good
Bad Irrelevant L (=0) Bad
Uncertain H (=1) Irrelevant Good
Uncertain L (=0) Irrelevant Bad
TA0201.EPS
For addition (see A2.3), 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.
A2.2.2 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.
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.
TIME_UNIT1
sec: ÷1
min: ÷60
hour: ÷3600
day: ÷86400
input1
kg/hour
input2
lb/s kg/s kg
increment2
increment1
lb/min
lb: pounds
Converts the unit into
that based on seconds
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:
0.453 in this example)
Converts the unit into
that based on seconds
TIME_UNIT2
sec: ÷1
min: ÷60
hour: ÷3600
day: ÷86400
kg/s kg
؋ block execution time
؋ block execution time
FA0202.EPS
is
Figure A2.2 Increment Calculation with Rate Input