Emerson Rosemount 3051 Manual page 39

IN
IN_LO
ARTHM
IN_1
IN_2
IN_3
IN_1
SGCR
IN_2
BKCAL_IN
CAS_IN
FF_VAL
PID
IN
TRK_IN_D
TRK_VAL
Arithmetic Block
The Arithmetic function block provides the ability to configure a range
extension function for a primary input and applies the nine (9) different
arithmetic types as compensation to or augmentation of the range
extended input. All operations are selected by parameter and input
OUT
connection.
Signal Characterizer Block
IN_1 and IN_2
OUT_1
OUT_1
OUT_2
OUT_2
The Signal Characterizer (SGCR) function block characterizes or
approximates any function that defines an input/output relationship.
The function is defined by configuring as many as twenty X,Y
coordinates. The block interpolates an output value for a given input
value using the curve defined by the configured coordinates. Two
separate analog input signals can be processed simultaneously to give
two corresponding separate output values using the same defined
curve.
PID Block
BKCAL_IN
BKCAL_OUT
OUT
CAS_IN
FF_VAL
IN
TRK_IN_D
TRK_VAL
BKCAL_OUT = The value and status required by the BKCAL_IN input of another
OUT
The PID function block combines all of the necessary logic to perform
proportional/integral/derivative (PID) control. The block supports mode
control, signal scaling and limiting, feedforward control, override
tracking, alarm limit detection, and signal status propagation.
The block supports two forms of the PID equation: Standard and Series.
You can choose the appropriate equation using the FORM parameter.
The Standard ISA PID equation is the default selection.
= The input values to the block.
= The output associated with IN_1.
= The output associated with IN_2.
= The analog input value and status from another block's BKCAL_OUT
output that is used for backward output tracking for bumpless transfer
and to pass limit status.
= The remote setpoint value from another function block.
= The feedforward control input value and status.
= The connection for the process variable from another function block.
= Initiates the external tracking function.
= The value after scaling applied to OUT in Local Override mode.
function block to prevent reset windup and to provide bumpless
transfer to closed loop control.
= The block output and status.
Configuration
3-3