The following table lists the system parameters for the Lead/Lag function block:
Table: Lead/Lag function block system parameters
Parameter
Units
Description
ABNORM_ACTIVE
None
The indication that a block error condition not selected in BAD_MASK (on the function block level) is True (Active) or the indication that 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).
BAD_ACTIVE
None
The indication that a block error condition selected in BAD_MASK (at the function block level) is True (Active) or the indication that 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 are True, the BAD_ACTIVE parameter becomes True. When any of the BLOCK_ERR conditions that are not included in BAD_MASK are True, ABNORM_ACTIVE becomes True.
BAL_TIME
Seconds
Specifies the time for PV to match the OUT value after a transition from Man or OOS to Auto mode.
BLOCK_ERR
None
The error condition associated with the block. The errors that can appear are:
Out Of Service
FOLLOW
None
Allows OUT to track IN × GAIN (True [1] = active, False [0] = inactive).
GAIN
None
The gain value applied to IN.
IN
Determined by source
The analog input value and status to be dynamically compensated by the block.
LAG_TIME
Seconds
The lag time constant applied in dynamic compensation.
LEAD_TIME
Seconds
The lead time constant applied in dynamic compensation.
MODE
None
Parameter used to request and show the source of the output used by the block.
OUT
EU of IN
The primary value and status calculated by the block in Auto mode. OUT can be set manually in Man mode.
OUT_HI_LIM
EU of IN
The maximum output value allowed.
OUT_LO_LIM
EU of IN
The minimum output value allowed.
PV
EU of IN
The process variable used in block execution and alarm limit detection.
Note
Default values and data type information for the parameters are available by expanding the Parameter View window.