Arithmetic function block parameters

The following table lists the parameters for the Arithmetic function block.

Table: Arithmetic function block 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).
ALERT_KEY⁽¹⁾	None	A user-assigned identification number reported in alarm messages from the block that allows HMI applications to sort and filter alarms and events. Set this parameter for each function block to indicate the physical unit the function block is associated with. This information can be used in the host for sorting alarms, and so on.
ARITH_TYPE	None	The set of nine arithmetic functions applied as compensation to or augmentation of the range extended input.
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 a block value to match an input, output, or calculated value or the time for dissipation of the internal balancing bias.
BIAS	None	The bias value
BIAS_IN_1	None	The bias value for IN_1
BIAS_IN_2	None	The bias value for IN_2
BIAS_IN_3	None	The bias value for IN_3
BLOCK_ERR	None	The summary of active error conditions associated with the block. The possible block errors are: Out of Service Input Failure/Bad PV
COMP_HI_LIM	EU of PV_SCALE	Determines the high limit of the compensation input
COMP_LO_LIM	EU of PV_SCALE	Determines the low limit of the compensation input
GAIN	None	The proportional gain (multiplier) value
GAIN_IN_1	None	The proportional gain (multiplier) value for IN_1
GAIN_IN_2	None	The proportional gain (multiplier) value for IN_2
GAIN_IN_3	None	The proportional gain (multiplier) value for IN_3
IN	Determined by source or EU of PV_SCALE or EU of IN_SCALE	The analog input value and status. The number of inputs is an extensible parameter in some function blocks.
IN_1	Determined by supplying block or source	The first analog input value and status
IN_2	Determined by supplying block or source	The second analog input value and status
IN_3	Determined by supplying block or source	The third analog input value and status
IN_LO	None	The value used for the input whenever IN is below range
INPUT_OPTS	None	Allow you to set the options for using IN and IN_LO when Uncertain. They also allow you to set the options for using IN_1, IN_2 and IN_3 when any are either Bad or Uncertain. When a particular option is not selected and the status is Bad or Uncertain, the last usable value is used. A value is usable if the status is Good or if the status is not Good but the input option for that status (Bad or Uncertain) is selected to use it. To change the input options while using the on-line view, first change the mode to OOS.
MODE	None	The mode record of the block. MODE contains the actual, target, permitted, and normal modes. In some function blocks, this parameter is used to request and show the source of the setpoint, the source of the output, and/or the block operating state.
OUT	EU of OUT_SCALE or Percent or EU of IN	The analog output value and status. The number of outputs is an extensible parameter in some blocks.
OUT_HI_LIM	EU of OUT_SCALE or Supplied by IN	The maximum output value allowed
OUT_LO_LIM	EU of OUT_SCALE or Supplied by IN	The minimum output value allowed
PRE_OUT	EU of PV_SCALE	The calculated result of the selected math function after limiting
PV	EU of OUT or EU of PV_SCALE or EU of IN_SCALE	The process variable used in block execution and alarm limit detection
PV_SCALE⁽¹⁾	None	The high and low scale values, the engineering units code, and the number of digits to the right of the decimal point associated with the PV.
RANGE_HI	EU of PV_SCALE	The high limit for IN
RANGE_LO	EU of PV_SCALE	The low limit for IN. If IN is less than RANGE_LO, then IN_LO is used.
ST_REV⁽¹⁾	None	The revision level of the static data associated with the function block. To support tracking changes in static parameter fields, the associated block's static revision parameter is incremented each time a static parameter field value is changed. Also, the associated block's static revision parameter is incremented if a static parameter field is written but the value is not changed.
STRATEGY⁽¹⁾	None	Used to identify groupings of blocks. This data is not checked or processed by the block.

⁽¹⁾ These parameters are only visible when the function block is extended to a fieldbus device.