Instruction Manual
D103412X012
Detailed Setup—AI Function Block
July 2013
175
When the converted input value is below the limit specified by the LOW_CUT [17] parameter, a value of zero is used
for the converted value (PV [7]). This option is useful to eliminate false readings when the differential pressure
measurement is close to zero.
Note
Invert is the only I/O option supported by the AI block. You can set the I/O option in Out of Service mode only.
Advanced Features
The AI function block provided with the DVC6200f provides added capability through the addition of the following
parameters:
ALARM_SEL—Allows one or more of the process alarm conditions detected by the AI function block to be used in
setting its OUT_D [37] parameter.
OUT_D—Discrete output of the AI function block based on the detection of process alarm condition(s). This parameter
may be linked to other function blocks that require a discrete input based on the detected alarm condition.
STDDEV and CAP_STDDEV— are diagnostic parameters that can be used to determine the variability of the process.
Simulation
To support testing, you can either change the mode of the block to manual and adjust the output value, or you can
enable simulation through the configuration tool and manually enter a value for the measurement value and its status.
To enable simulation, you must first install the Simulate Enable jumper across the instrument AUX terminals (see page
36). Next you must use the configuration tool to enable the parameter SIMULATE [9].
With simulation enabled, the actual measurement value has no impact on the OUT [8] value or the status.
Block Errors
Table 4‐55 lists conditions reported in the BLOCK_ERR [6] parameter. Conditions in italics are inactive for the AI block
and are given here only for your reference.
Table 4‐55. BLOCK_ERR Conditions
Condition Number Condition Name and Description
0 Other
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
6 Device Needs Maintenance Soon
7 Input failure/process variable had Bad status ‐ The hardware is bad, or a bad status is being simulated
8 Output failure
9 Memory failure
10 Lost Static Data
11 Lost NV Data
12 Readback Check Failed
13 Device Needs Maintenance Now
14 Power Up - This condition exists until the AI function block executes for the first time.
15 Out of Service ‐ The actual mode is Out of Service.
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