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ABNORM_ACTIVE
|
None
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The indication that a block error condition not selected in
BAD_MASK (on the function block level) is True (Active), an error condition (at
the module level) not selected in MERROR_MASK is True (Active), or a module
status not selected in MSTATUS_MASK is True (Active).
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BAD_ACTIVE
|
None
|
The indication that a block error condition selected in
BAD_MASK (at the function block level) is True (Active), an error condition (at
the module level) selected in MERROR_MASK is True (Active), or a module status
selected in MSTATUS_MASK is True (Active).
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BAD_MASK
|
None
|
The set of active error conditions that triggers a user-defined
Bad condition. The user selects a subset of block error (BLOCK_ERR) conditions
in the BAD_MASK parameter. When any of these conditions is True, the BAD_ACTIVE
parameter becomes True. When any of the BLOCK_ERR conditions not included in
BAD_MASK is True, ABNORM_ACTIVE becomes True.
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BKCAL_IN [1–4]
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EU of MNPLT
|
The analog input value and status from another block's
BKCAL_OUT output that is used by an upstream block for bumpless transfer. The
number of BKCAL_IN parameters corresponds to the number of MNPLT parameters.
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BLOCK_ERR
|
None
|
The summary of active error conditions associated with the
block. The block errors for the MPC function block are:
-
OOS
-
Local Override
-
Configuration Error
-
Simulate Active
-
Input Failure/Bad PV
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CNSTR [1–4]
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The output units of the connected block
|
Constrained parameter (input to MPC function block). Is a range
within which the output must fall.
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CNTRL [1–4]
|
The output units of the connected block
|
Controlled parameter (input to MPC function block). Is
maintained at a specific value (setpoint) by adjusting the function block's
manipulated output.
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DSTRB [1–4]
|
The output units of the connected block
|
Disturbance inputs (to the MPC function block). The impact of
disturbance inputs on controlled and constraint parameters is reduced
substantially through the MPC block's adjusting manipulated inputs to
compensate for changes in the disturbance inputs.
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INSPECT_ACT
|
None
|
Indicates if Inspect is enabled and one or more of the limits
for the block have been exceeded. The normal value is 0. This parameter is set
to 1 if both of the following conditions are True:
-
The
Write To Inspect Alarm context menu
item was selected from Inspect for this block.
-
With the Current Hour filter selected, Inspect indicates
that an abnormal condition exists for Mode, Control, Input, or Variability.
(Note that an abnormal condition will only exist for Variability if both the
Variability Index
and the Standard Deviation have exceeded their defined
limits.)
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MNPLT [1–4]
|
The input units of the connected block
|
Manipulated output (from the MPC function block). A variable
that is adjusted either automatically by the MPC block or manually by an
operator. The MPC algorithm acts on the manipulated value to maintain the
constraints within limits and the controlled parameter values at setpoint.
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MODE
|
None
|
Parameter used to show and set the block operating state. MODE
contains the actual, target, permitted, and normal modes.
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SP [1–4]
|
EU of CNTRL
|
The operator's setpoint values. The number of SP parameters
corresponds to the number of CNTRL parameters.
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|
SP_WRK [1–4]
|
EU of CNTRL
|
The working setpoint of the block. The filtered value of the
operator setpoint values used in determining control action.
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|
STDEV
|
Percent of scale
|
The largest standard deviation calculation for the control
parameters over the standard deviation time.
|
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STDEV_CAP
|
Percent of scale
|
The estimated capability standard deviation (measurement of
short term variation). An estimate of the least standard deviation the process
could achieve ideally.
|
|
STDEV_TIME
|
Seconds
|
The time frame over which STDEV and STDEV_CAP are performed. The
default value of zero is good for most processes where the scan rate is no more
than approximately 10 times faster than the time to steady state.
If the process is relatively much slower, it is recommended
that you enter the approximate time it takes for the process to return to
steady state after a change. This ensures that the STDEV and STDEV_CAP
calculations accurately consider the actual time constant of the process.
|