Analog Control Blocks > Bias/Gain function block

Bias/Gain function block parameters

The following table lists the system parameters for the Bias/Gain function block:

Table: Bias/Gain 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).

BAD_ACTIVE

None

The indication that a block error condition selected in BAD_MASK (at the function block level) 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 dissipation of the internal balancing bias.

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 OUT_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 Bias/ Gain function block are:

  • Out of Service.

  • Local Override

CAS_IN

EU of PV_SCALE

The remote analog setpoint value from another block.

CONTROL_OPTS

None

Use control options to specify control strategy options. The supported control options for the Bias/Gain function block are:

  • No OUT limits in Manual

  • Obey SP lim if Cas or RCas

  • Use BKCAL_OUT With IN_1

  • Act on IR

  • Track in Manual

  • Track Enable

  • SP Track Retained Target.

FRSIRB_OPTS

None

The supported FRSIRB_OPTS option option is Treat_IN_1 As Wild. When Treat_IN_1 As Wild is true regardless of cascade or non-cascade connection IN_1 is treated as a non-cascade input and if Use_Bkcal_out_With_IN_1 is true Bkcal_out sub-status will be set to keep cascade closed.

GAIN

None

The multiplier applied in GAIN × (SP + IN_1).

IN_1

Determined by source

The input with status to which the bias (SP) is applied.

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_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.

RCAS_IN

EU of SP_SCALE

The remote setpoint value and status. Input provided by a remote device or the output of another block.

RCAS_OUT

EU of PV_SCALE

The output provided for bumpless mode transfer and reset limiting by the source of RCAS_IN. Essentially the equivalent of BKCAL_OUT for RCAS_IN.

SHED_OPT

None

Defines action to be taken on remote control device time out.

SP

EU of OUT_SCALE

The block's setpoint value.

SP_HI_LIM

EU of OUT_SCALE

The highest setpoint value allowed.

SP_LO_LIM

EU of OUT_SCALE

The lowest setpoint value allowed.

SP_RATE_DN

EU of OUT_SCALE per second

Rate of change limit for decreasing setpoint. When SP change violates the limit the effect is a ramp into the working setpoint (SP_WRK).

SP_RATE_UP

EU of OUT_SCALE per second

Rate of change limit for increasing setpoint. When SP change violates the limit the effect is a ramp into the working setpoint (SP_WRK).

SP_WRK

EU of OUT_SCALE

The working setpoint of the block. It is the result of setpoint limiting and setpoint rate of change limiting.

STATUS_OPTS

None

Status options determine how status is processed and handled. The available options are:

  • Target to Manual if Bad IN

  • Use Uncertain as Good

  • IFS if Bad CAS_IN

  • IFS if Bad IN

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 input value with status applied to OUT in LO mode.

Note

Default values and data type information for the parameters are available by expanding the Parameter View window.