Filter
Top Products
Rosemount Model 8800C Vortex Flowmeter with FOUNDATION
TM
Fieldbus
B-6
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 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.
Block Errors 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.
Modes The AI Function Block supports three modes of operation as defined by
the MODE_BLK parameter:
• Manual (Man) The block output (OUT) may be set manually
• Automatic (Auto) OUT reflects the analog input measurement
or the simulated value when simulation is enabled.
PV
FIELD_VAL
100
-------------------------------
EU**@100% EU**@0%–()EU**@0%+×=
** OUT_SCALE values
TABLE B-2. BLOCK_ERR Conditions.
Condition
Number
Condition Name and Description
0Other
1 Block Configuration Error: the selected channel carries a measurement that is
incompatible with the engineering units selected in XD_SCALE, the L_TYPE
parameter is not configured, or CHANNEL = zero.
2 Link Configuration Error
3 Simulate Active: Simulation is enabled and the block is using a simulated value
in its execution.
4 Local Override
5 Device Fault State Set
6 Device Needs Maintenance Soon
7 Input Failure/Process Variable has Bad Status: The hardware is bad, or a bad
status is being simulated.
8 Output Failure: The output is bad based primarily upon a bad input.
9 Memory Failure
10 Lost Static Data
11 Lost NV Data
12 Readback Check Failed
13 Device Needs Maintenance Now
14 Power Up
15 Out of Service: The actual mode is out of service.