Response Electronics CL6011B Especificaciones descargar pdf (Pagina 44)

3Ć24 Theory of Operation: Point Processing

Original Ć June 1990CE4.2:CL6211

3.3.3.2.3 Track

The track function modifies the tracking characteristics of a point. It

causes the output of the control algorithm to track the specified track

signal value when tracking is enabled. This function also allows for

tracking to override manual mode.

3.3.3.2.4 Gas Chromatograph Interface

Gas Chromatograph Interface (GCI) performs a sample and hold

operation on the process variable input whenever the GCI data ready

input makes a 0 to 1 transition. The GCI function will enable integral

control action for the length of time specified (controller on-time) after

the GCI data ready input has made a 0 to 1 transition. The controller

integral action is then held after the controller on-time has elapsed.

There will be no change to the output of the control algorithm when the

integral action is held because the GCI function is holding its output

which would be the process variable to the control algorithm. When

used, the feedforward function is active when the control algorithm is

being held by the GCI function. Therefore, the output from the station

will change when there is a change in feedforward control action.

If a new GCI data ready input is not received by the time the specified

timeout time has elapsed, the GCI function sets the point to the manual

mode and sets the discrete signal value output of the GCI function block

to a logic 1 to indicate timeout. A new data ready trigger will reset the

discrete signal value output to a logic 0, but will not automatically switch

the mode.

3.3.3.2.5 Cascade

The cascade function provides cascade control linkage between two

direct control points; the second of which must have remote set point

mode. The implied valve position (IVP) of the primary loop is

automatically placed into the set point of the secondary loop when the

secondary loop is in the remote set point mode.

When the secondary loop is in the manual mode, the IVP of the primary

loop tracks the process variable of the secondary loop.

When the secondary loop is in the local automatic mode, the IVP of the

primary loop tracks the local set point of the secondary loop.

When the secondary loop is in the remote set point mode, the IVP of the

primary loop becomes the set point of the secondary loop.

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Response Electronics CL6011B Especificaciones Pagina 44