A5.2.3 Converting Accumulation; A5.2.4 Determining The Input Flow Direction - YOKOGAWA digitalYEWFLO Series User Manual

A5.2.3 Converting Accumulation

This following describes an example of
accumulation conversion.
In accumulation conversion, the difference between
the value executed previously and the value
executed this time is integrated or accumulated.
This conversion applies when the output of a
function block used as a counter is input to the input
process of the Integrator block.
In order to convert the rate of change of an input
to a value with an engineering unit, the user must
configure the factor of conversion to the appropriate
engineering unit in the PULSE_VAL1 and PULSE_
VAL2 parameters.
Moreover, the unit of IN_2 is standardized to that
of IN_1 in the same way as rate conversion. Thus,
the user must also set an appropriate value to
UNIT_CONV.
input1
[Current read value] – [Previous read value]
counts
input2
[Current read value] – [Previous read value]
counts
<APPENDIX 5. INTEGRATOR (IT) BLOCK>
number of pulse
number of pulse
Figure A5.3 Increment Calculation with Counter Input
A5.2.4 Determining the Input Flow
Direction
The Integrator block also considers the input flow
direction. Information about the input flow direction
is contained in REV_FLOW1 and REV_FLOW2 (0:
FORWARD, 1: REVERSE).
In input processing, the sign of the value after rate
and accumulation conversion is reversed if the
REV_FLOW1 and REV_FLOW2 parameters are
set to REVERSE. When determination of the flow
direction of two input values is complete, these
two inputs are passed to the adder. The settings in
REV_FLOW will be retained even if the power is
turned OFF.
PULSE_VAL1(#19)
× [pulse value1]
kg/pulse
PULSE_VAL2(#20)
× [pulse value2]
lb
lb/pulse
A5-3
increment1
kg
increment2
UNIT_CONV(#18)
× [conversion factor]
kg
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