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Signal Conversion
Block Errors
Model 4081FG Oxygen Analyzer with F
You can set the signal conversion type with the Linearization Type
(L_TYPE) parameter. You can view the converted signal (in percent of
XD_SCALE) through the FIELD_VAL parameter.
100
------------------------------------------------------------------------------------- -
FIELD_VAL
=
You can choose from direct, indirect, or indirect square root signal
conversion with the L_TYPE parameter.
Direct
Direct signal conversion allows the signal to pass through the accessed
channel input value (or the simulated value when simulation is enabled).
PV
=
Channel Value
Indirect
Indirect signal conversion converts the signal linearly to the accessed
channel input value (or the simulated value when simulation is
enabled) from its specified range (XD_SCALE) to the range and units of
the PV and OUT parameters (OUT_SCALE).
FIELD_VAL
------------------------------- -
PV
=
100
Indirect Square Root
Indirect Square Root signal conversion takes the square root of the
value computed with the indirect signal conversion and scales it to the
range and units of the PV and OUT parameters.
FIELD_VAL
------------------------------- -
PV
=
100
When the converted input value is below the limit specified by the
LOW_CUT parameter, and the Low Cutoff I/O option (IO_OPTS) is
enabled (True), a value of zero is used for the converted value (PV). This
option is useful to eliminate false readings when the differential
pressure measurement is close to zero, and it may also be useful with
zero-based measurement devices such as flowmeters.
NOTE
Low Cutoff is the only I/O option supported by the AI block. You can set
the I/O option in Manual or Out of Service mode only.
Table B-2 lists conditions reported in the BLOCK_ERR parameter.
Conditions in italics are inactive for the AI block and are given here
only for your reference.
OUNDATION
×
(
Channel Value EU*@0%
–
(
)
EU*@100% EU*@0%
–
×
(
EU**@100% EU**@0%
–
×
(
EU**@100% EU**@0%
–
fieldbus Communications
)
* XD_SCALE values
)
+
EU**@0%
** OUT_SCALE values
)
+
EU**@0%
** OUT_SCALE values
B-5
B
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Table of Contents
Troubleshooting
