|
ABNORM_ACTIVE
|
None
|
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).
|
|
ALARM_HYS
|
Percent
|
The amount that the alarm value must return within the alarm
limit before the associated active alarm condition clears. ALARM_HYS is limited
to 50% of scale.
|
|
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).
|
|
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.
|
|
BKCAL_IN
|
EU of OUT_SCALE
|
The analog input value and status from another block's
BKCAL_OUT output that is used by an upstream block for bumpless transfer.
|
|
BKCAL_OUT
|
EU of PV_SCALE
|
The value and status required by the BKCAL_IN input of another
block to prevent reset windup and to provide bumpless transfer to closed loop
control.
|
|
BLOCK_ERR
|
None
|
The summary of active error conditions associated with the
block. The possible block errors for the FLC function block are:
-
Out of Service
-
Readback Failed
-
Output Failure
-
Input Failure/Bad PV
-
Local Override
-
Simulate Active
-
Configuration Error
-
Other Error
|
|
BYPASS
|
None
|
The Bypass option is intended for slave PID blocks whose PV
status is Bad.
When BYPASS is on and the block is in AUTO, CAS, or RCAS mode,
the block bypasses the normal control algorithm by transferring the SP value
(in percent) to OUT.
When BYPASS is on and the block is in MAN, ROUT, LO, or IMAN
mode, SP is calculated from the value of OUT. The value of SP is not affected
by any of the
SP-PV track... control options. The
value of BKCAL_OUT is not affected by the
Use PV for BKCAL_OUT control option.
When BYPASS is off, the block operates normally.
To turn BYPASS on or off, select the CONTROL_OPTS Bypass
Enable option and set the block to MAN or OOS mode, then change BYPASS to On or
Off.
|
|
CAS_IN
|
EU of PV_SCALE
|
The remote setpoint value from another block.
|
|
CONTROL_OPTS
|
None
|
Control options allow you to specify control strategy options.
The supported control options for the FLC function block are:
-
No OUT limits in Manual
-
Obey SP lim if Cas or RCas
-
Use PV for BKCAL_OUT
-
Track in Manual
-
Track Enable
-
Direct Acting
-
SP-PV Track in LO or IMan
-
SP-PV Track in ROut
-
SP-PV Track in Man
-
Bypass Enable.
|
|
DV_HI_ACT
|
None
|
The result of alarm detection associated with DV_HI_LIM. If
DV_HI_ACT equals True, DV_HI_LIM has been exceeded.
|
|
DV_HI_LIM
|
EU of PV_SCALE
|
The amount by which PV can deviate above SP before the
deviation high alarm is triggered. The magnitude of DV_HI_LIM cannot be greater
than the range of PV_SCALE. When this limit is exceeded, DV_HI_ACT is set to
True.
|
|
DV_LO_ACT
|
None
|
The result of alarm detection associated with DV_LO_LIM. If
DV_LO_ACT equals True, DV_LO_LIM has been exceeded.
|
|
DV_LO_LIM
|
EU of PV_SCALE
|
The amount by which PV can deviate below SP before the
deviation low alarm is triggered. The magnitude of DV_LO_LIM cannot be greater
than the range of PV_SCALE. When this limit is exceeded, DV_LO_ACT is set to
True. Note that DV_LO_LIM is a negative number and is compared against PV – SP.
|
|
ERROR
|
EU of PV_SCALE
|
The difference between SP (setpoint) and PV (process
variable).
|
|
FF_ENABLE
|
None
|
Enables/disables feedforward control.
|
|
FF_GAIN
|
None
|
The feedfoward gain value. FF_VAL is multiplied by FF_GAIN
before it is added to the calculated control output.
|
|
FF_SCALE
|
None
|
The high and low scale values, engineering units code, and
number of digits to the right of the decimal point associated with the
feedforward value (FF_VAL).
|
|
FF_VAL
|
EU of FF_SCALE
|
The feedforward control input value and status.
|
|
FIELD_VAL
|
Percent
|
The value and status from either the I/O card or the simulated
input (if simulation is enabled).
|
|
HI_ACT
|
None
|
The result of alarm detection associated with HI_LIM. If
HI_ACT equals True, HI_LIM has been exceeded.
|
|
HI_HI_ACT
|
None
|
The result of alarm detection associated with HI_HI_LIM. If
HI_HI_ACT equals True, HI_HI_LIM has been exceeded.
|
|
HI_HI_LIM
|
EU of PV_SCALE
|
The setting for the alarm limit used to detect the high high
alarm condition.
|
|
HI_LIM
|
EU of PV_SCALE
|
The setting for the alarm limit used to detect the high alarm
condition.
|
|
IN
|
EU of PV_SCALE
|
The connection for the PV input from another block.
|
|
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.)
|
|
IO_IN
|
None
|
Defines the input DST for the I/O channel used for the PV.
|
|
IO_OPTS
|
None
|
I/O options allow you to select how I/O signals are processed.
The available options are:
-
Low cutoff
-
Increase to close
|
|
IO_OUT
|
None
|
Defines the output DST for the block.
|
|
IO_READBACK
|
None
|
Defines the Device Signal Tag (DST) for the input channel that
provides readback for the value written to the channel defined by IO_OUT.
|
|
L_TYPE
|
None
|
Linearization type. Determines whether the field value is used
directly (Direct), is converted linearly (Indirect), or is converted with the
square root (Indirect Square Root).
|
|
LO_ACT
|
None
|
The result of alarm detection associated with LO_LIM. If
LO_ACT equals True, LO_LIM has been exceeded.
|
|
LO_LIM
|
EU of PV_SCALE
|
The setting for the alarm limit used to detect the low alarm
condition.
|
|
LO_LO_ACT
|
None
|
The result of alarm detection associated with LO_LO_LIM. If
LO_LO_ACT equals True, LO_LO_LIM has been exceeded.
|
|
LO_LO_LIM
|
EU of PV_SCALE
|
The setting for the alarm limit used to detect the low low
alarm condition.
|
|
LOW_CUT
|
EU of PV_SCALE
|
Activated when the
Low Cutoff I/O option is enabled (True).
When the converted measurement is below the LOW_CUT value, the PV is set to
0.0.
|
|
MODE
|
None
|
Parameter used to show and set the block operating state.
|
|
OUT
|
EU of OUT_SCALE
|
The block output value and status.
|
|
OUT_HI_LIM
|
EU of OUT_SCALE
|
The maximum output value allowed.
|
|
OUT_LO_LIM
|
EU of OUT_SCALE
|
The minimum output value allowed.
|
|
OUT_READBACK
|
EU of OUT_SCALE
|
The value and status of the output channel referenced by
IO_READBACK.
|
|
OUT_SCALE
|
None
|
The high and low scale values, engineering units code, and
number of digits to the right of the decimal point associated with OUT.
|
|
PV
|
EU of PV_SCALE
|
The process variable used in block execution and alarm limit
detection.
|
|
PV_FTIME
|
Seconds
|
The time constant of the first-order PV filter.
|
|
PV_SCALE
|
None
|
The high and low scale values, engineering units code, and
number of digits to the right of the decimal point associated with PV.
|
|
RCAS_IN
|
EU of SP_SCALE
|
The remote analog setpoint value and status. Input provided by
either a device or the output of another block.
|
|
RCAS_OUT
|
EU of PV_SCALE
|
The remote analog setpoint value and status after ramping.
Output provided to a device for back calculation and to allow action to be
taken under limiting conditions or mode change.
|
|
ROUT_IN
|
EU of OUT_SCALE
|
Remote output value and status. Input provided by a device to
the control block for use as the output (ROut mode).
|
|
ROUT_OUT
|
EU of OUT_SCALE
|
Remote output value and status. Output provided to a device
for back calculation in ROut mode and to allow action to be taken under
limiting conditions or mode change.
|
|
SF_DELTERR
|
None
|
The change-in-error scaling factor. A tuning parameter that
converts the change in error (from previous scan) to a normalized value used by
the fuzzy logic algorithm.
|
|
SF_ERROR
|
None
|
The error scaling factor. A tuning parameter that converts the
error (PV-SP) to a normalized value used by the fuzzy logic algorithm.
|
|
SF_OUTPUT
|
None
|
The change-in-output scaling factor. A tuning parameter that
converts the normalized output of the fuzzy logic algorithm to an increment of
change for OUT.
|
|
SHED_OPT
|
None
|
Defines action to be taken on remote control device timeout.
|
|
SHED_TIME
|
Seconds
|
The maximum allowable time between RCAS_IN and ROUT_IN
updates. If exceeded, mode shedding takes place.
|
|
SIMULATE
|
Percent
|
Enables simulation and allows you to enter an input value and
status. The SIMULATE value is used by the block only when SIMULATE_IN is not
connected.
|
|
SIMULATE_IN
|
Percent
|
The input connector value and status used by the block instead
of the analog measurement when simulation is enabled. If SIMULATE_IN is
connected or has a manually entered value, SIMULATE_IN will always override
SIMULATE.
Note
When SIMULATE_IN is wired from an input source on the
function block diagram, it will always override a manually entered value.
|
|
SP
|
EU of PV_SCALE
|
The block's setpoint value.
|
|
SP_FACTOR
|
Percent
|
The minimum setpoint change between scans required to initiate
scaling factor adaptation.
|
|
SP_FTIME
|
Seconds
|
Time constant of the first order SP filter.
|
|
SP_HI_LIM
|
EU of PV_SCALE
|
The highest SP value allowed.
|
|
SP_LO_LIM
|
EU of PV_SCALE
|
The lowest SP value allowed.
|
|
SP_RATE_DN
|
EU of PV_SCALE per second
|
Ramp rate at which downward setpoint changes are acted on in
Auto mode (in PV units per second). If the ramp rate is set to 0.0, the
setpoint will be used immediately. For control blocks, rate limiting applies
only in Auto mode. For output blocks, rate limiting applies in Auto, Cas, and
RCas modes.
|
|
SP_RATE_UP
|
EU of PV_SCALE per second
|
Ramp rate at which upward setpoint changes are acted on in
Auto mode (in PV units per second). If the ramp rate is set to 0.0, the
setpoint will be used immediately. For control blocks, rate limiting applies
only in Auto mode. For output blocks, rate limiting applies in Auto, Cas, and
RCas modes.
|
|
SP_WRK
|
EU of PV_SCALE
|
The working setpoint of the block. It is the result of
setpoint limiting and/or setpoint rate-of-change limiting.
|
|
STATUS_OPTS
|
None
|
Status options allow you to select options for status handling
and processing. The supported status options for the FLC function block are:
-
Bad if Limited
-
Uncertain if Limited
-
Target to Manual if Bad IN
-
Use Uncertain as Good
|
|
STDEV
|
EU of OUT_SCALE or EU of PV_SCALE
(reports in percent to Inspect)
|
The standard deviation of PV. For analog control blocks in
AUTO, mean is assumed to be the SP.
|
|
STDEV_CAP
|
EU of OUT_SCALE or EU of PV_SCALE
(reports in percent to Inspect)
|
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.
|
|
TRACK_OPT
|
None
|
Allows for a choice for behaviors when the status of TRK_IN_D
is Bad. The three options are:
-
Always use value
-
Use last Good value
-
Track if Bad
|
|
TRK_IN_D
|
None
|
Discrete input that initiates external tracking.
|
|
TRK_SCALE
|
None
|
The high and low scale values, engineering units code, and
number of digits to the right of the decimal point associated with the external
tracking value (TRK_VAL).
|
|
TRK_VAL
|
EU of TRK_SCALE
|
The analog input used in the external tracking function.
|