Fisher FIELDVUE DVC6200f Instruction Manual page 133

Instruction Manual
D103412X012
D Act On IR—If this option is true, then when IR (Initialization Requested) is received on BKCAL_IN [27], the SP [8] will
be adjusted within setpoint limits to provide bumpless transfer when the cascade is closed. If the setpoint required
to provide bumpless transfer is outside the setpoint limits, then any difference added to provide bumpless transfer
will be removed in the BAL_TIME [25].
When one of these options is set, the SP[8] value is set to the PV [7] value while in the specified mode.
You can select the value that a master controller uses for tracking by configuring the Use PV for BKCAL_OUT control
option. The BKCAL_OUT [31] value tracks the PV value. BKCAL_IN [27] on a master controller connected to
BKCAL_OUT [31] on the PID block in an open cascade strategy forces its OUT [9] to match BKCAL_IN [27], thus
tracking the PV from the slave PID block into its cascade input connection (CAS_IN [18]). If the Use PV for BKCAL_OUT
option is not selected, the working set point (SP_WRK [68]) is used for BKCAL_OUT [31].
You can set control options in Manual or Out of Service mode only. When the mode is set to Auto, the SP [8] will
remain at the last value (it will no longer follow the PV [7].
PID Equation Structures for Enhanced PID Block
Note
Extended parameters are not available at this time for all host systems. Refer to your host system documentation, or contact your
Emerson Process Management sales office for additional information.
Configure the STRUCTURECONFIG [71] parameter to select the PID equation structure. You can select one of the
following choices:
D Proportional, integral, and derivative on error (PID)
D Proportional and integral on error, derivative on PV (PI_D)
D Integral on error, proportional and derivative on PV (I_PD)
D Proportional on error, derivative on error (PD)
D Integral on error, derivative on error (ID)
D Integral on error, derivative on PV (I_D)
D Two degrees of Freedom (2DOF)
Reverse and Direct Action
To configure the block output action, set the Direct Acting control option. This option defines the relationship
between a change in PV [7] and the corresponding change in output. With Direct Acting enabled (True), an increase in
PV results in an increase in the output.
You can set control options in Manual or Out of Service mode only.
Alarm Detection
A block alarm will be generated whenever the BLOCK_ERR [6] has an error bit set. The types of block error for the PID
block are defined above.
Detailed Setup—PID Function Block
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