7.11.6 Indirect signal conversion
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).
7.11.7 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.
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 flow meters.
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.
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