Response Electronics CL6011B Especificaciones descargar pdf (Pagina 49)

3Ć29 Theory of Operation: Point Processing

Original Ć June 1990 CE4.2:CL6211

Restart After a Download

After a download, when restart from last value is specified, the following

restart parameters are set to their failsafe values; set point = 0%,

bias = 0%, and ratio = 1. When a specific restart value is defined for

these parameters, that value is used. Mode always restarts at manual

after a download regardless of the defined restart value. The restart of

the IVP is described below.

The restart value of the IVP depends on whether the corresponding point

was previously configured. If the point was not previously configured

and restart from last value is specified, the IVP is set to 0%, and if a

predefined restart IVP value is specified, that value is used.

If the point was previously configured, then the point holds the last value

prior to download even if a predefined restart value is specified. When

the increase open/close setting of the point is changed, the

communicated IVP value is inverted (refer to the following example).

Example - The point was originally increase open, IVP was 75% and the

current output was 16 mA. The point was changed to increase close.

The new IVP value is 25% and the current output remains at 16 mA.

3.3.3.4.2 Set Point Tracking

Set point tracking is an optional way for a PCA to obtain its set point. The

set point can be configured to track the process variable when the point

is in DDC or manual mode. If set point tracking in DDC mode is enabled

and the point is in DDC mode, then the set point is set equal to the

process variable value. If set point tracking in manual mode is enabled

and the point is in manual mode, then the set point is once again set

equal to the process variable value.

Set point tracking in manual mode is available for all PCAs except the

bias and gain and the high/low signal selector, which effectively performs

set point tracking all of the time. Likewise, set point tracking in DDC

mode is available only if DDC is a valid mode for the point's configured

station type.

3.3.4 Direct Control Point Diagrams

The diagrams on the following pages illustrate the processing of the

various combinations of PCAs and station types.

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Response Electronics CL6011B Especificaciones Pagina 49