Response Electronics CL6011B Dokumentacja Pobierz pdf (Strona 39)

3Ć19 Theory of Operation: Point Processing

Original Ć June 1990 CE4.2:CL6211

Manual to RSP: The present value of all operating data is used at the

beginning of the transfer, with the exception of the set point, which is

now input from the RSP input. The PCA initialization and transfer bias

ramping (if enabled), are the same as in the manual or DDC to automatic

transfer.

Automatic to RSP: During this transfer, the execution of the PCA is

re-initialized because the source of the set point has changed. This is

done to prevent a bump in the IVP due to a difference between the local

set point and the remote set point. Transfer bias ramping, if applicable,

will be performed on the output.

RSP or Supervisory to Automatic: For this transfer, the set point

remains at its last established value until it is changed by the plant

operator. The IVP will not change.

Manual to Supervisory: The present value of all operating data is used

at the beginning of the transfer, with the exception of the set point, which

is now supplied by a host computer. The IVP will not be changed unless

transfer bias ramping is enabled.

Automatic to Supervisory: During this transfer, the PCA is re-initialized

because the set point source has changed. This is done to prevent a

bump in the IVP due to a difference between the local set point and the

set point supplied by the host computer. Transfer bias ramping will be

performed on the output if it is enabled; otherwise, the IVP will not

change.

Manual or Automatic to DDC: This transfer causes the IVP to hold until

changed by a host computer. The set point will not change unless set

point tracking in DDC mode is enabled, in which case the set point will

track the process variable.

3.3.3 Direct Control Point Details

3.3.3.1 Primary Control Algorithm Function Details

Primary Control Algorithm functions are items available for use with direct

control points (DCPs) that are configured to set up proper control of the

process. Their use depends on the requirements of the process. The

details of these functions are described in the following sections.

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Response Electronics CL6011B Dokumentacja Strona 39