<Appendix 2. Integrator (It) Block>
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IM 01E21A02-03EN
A2.2.4 Determining the Input Flow Direction
The IT 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 the RATE/ACCUM 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.
A2.3 Adder
When input processing is complete, two arguments that have been RATE/ACCUM-converted will
be passed to the adder.
The adder adds these two values in accordance with the option.
A2.3.1 Status of Value after Addition
If one of the statuses of the 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 the 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.
A2.3.2 Addition
The following three options are available for addition:
• TOTAL .................... Adds two arguments 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
(Flowr everse)
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”.
