Response Electronics CL6011B Especificaciones descargar pdf (Pagina 43)

3Ć23 Theory of Operation: Point Processing

Original Ć June 1990 CE4.2:CL6211

variable has been stored as the point's process variable attribute. The

first step is calculating a model process variable using the Model

Dead-time value. This model process variable is then used to calculate

the model error by taking the difference between the model process

variable and the actual process variable. The model error value is then

corrected by adjusting either the model gain or the model bias, a choice

which is dependent upon whether the primary process load disturbance

modifies the process gain or the process bias. A second model process

variable, which is the model of the process variable as it would appear

without dead-time, is then calculated. This new model process variable

also takes into account the Model Error, and is the process variable

which is output from the compensation function to the PCA.

If the model process variable accurately reflects the actual process, then

the model output cancels the process feedback signal. Under these

conditions, the closed loop characteristics are only a function of the

controller and the process model without dead-time. An improvement

in control is then possible because of the elimination of dead-time from

the model equation. This option is available only with the PID PCA.

The DTC function allows for a reset to be used to disable the function.

When the reset value is a logic 1, the function is disabled. When the

reset value is set back to a logic 0, the function re-initializes and starts

performing its compensation routine.

3.3.3.2.2 Override

The override function causes the output of the control algorithm to

perform either output or integral tracking. When output tracking is

enabled, the control algorithm output tracks the specified track signal

value when the point is in auto, RSP, SUP or DDC modes. This function

also allows for output tracking to override manual mode. When output

tracking is disabled and integral tracking is enabled, an analog value is

read in from the specified track signal value and is substituted for the

calculated integral term in the control algorithm.

Note

To avoid loop windup in override control applications

for which integral tracking (operand 4) is enabled,

place a FIL function and a RGST function immediately

after the AOUT function of the loop containing the

signal selecting operation. The name of the general

operand 2 of the OVRD function. Refer to section

NO TAG (page NO TAG) for instructions on

determining the correct filter time constant. Refer to

the FST configuration section for more details on the

individual functions.

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