Yokogawa digitalYEWFLO (DY-FF) - Manual (Page 100)

A5.3 Adder
When input processing is complete, two arguments
that have been rate and accumulate converted will
be passed to the adder. The adder adds these two
values according to the option.
A5.3.1 Status of Value after Addition
If one of the statuses of two arguments is “Bad” or if
two of them are both “Bad,” the status of the value
after addition becomes “Bad.” In this case, the value
of “Good” just before the status changed to “Bad” is
used as the addition value.
When the statuses of two arguments are both
“Good,” the status of the value after addition
becomes "Good." In this case, the status of the
value after addition will be used for the status
applied to integration.
A5.3.2 Addition
The following three options are available for
addition:
• TOTAL: Adds two argument values as is.
• FORWARD: Adds two argument values,
regarding a negative value as “0.”
• REVERSE: Adds two argument values,
regarding a positive value as “0.”
You can choose these options using bit 2 and bit 3
of INTEG_OPTS as follows:
Bit 2 of INTEG_OPTS
(Flow Forward)
Bit 3 of INTEG_OPTS
(Flow Reverse)
Adder Options
H H TOTAL
L L TOTAL
H L FORWARD
L H REVERSE
The result of the adder is passed to the integrator.
If only one of the inputs is connected, the value of a
non-connected input will be ignored.
When bit 7 of INTEG_OPTS (Add zero if bad) has
been set, if the status of a value after addition is
“Bad,” the value after addition (increment) becomes
“0.”
A5.4 Integrator
When addition is complete, its result will be passed
to the integrator.
Integration consists of combinations of a reset
method and counting up/down. There are the
following seven integration types, which can be set
using INTEG_TYPE.
1. UP_AUTO : Counts up with automatic
reset when TOTAL_SP is
reached
2. UP_DEM : Counts up from 0 and reset on
demand.
3. DN_AUTO : Counts down with automatic
reset when zero is reached
4. DN_DEM : Counts down from SP and
reset on demand.
5. PERIODIC : Counts up from 0 and is reset
periodically according to
CLOCK_PER
6. DEMAND : Counts up from 0 and is reset
on demand
7. PER&DEM : Counts up from 0 and is reset
periodically or on demand
Each type of integration is independently run as a
function.
There are the following four types of integrated
values:
1. Total: Integrates the result of the adder as is.
2. ATotal: Integrates the absolute value of the
result of the adder.
3. RTotal: Integrates the absolute value of the
result of the adder only if the status of the
result is "Bad."
This value is used for the RTOTAL value.
4. AccTotal: An extension function. The result
of the adder is integrated as is and will not be
reset.
The value is used for the ACCUM_TOTAL
(expanded parameter) value.
The Table A5.1 shows the details of INTEG_TYPE.
<APPENDIX 5. INTEGRATOR (IT) BLOCK>
A5-4
IM 01F06F00-01EN