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5Ć3Configuration Tips

Original Ć June 1990 CE4.2:CL6211

The following FST steps in the ratio controller will read the primary

variable, apply the ratio, and store the remote set point in the ratio

controller:

RTOLD( FIC–2 ),

MUL(PVLD( FIC–1 )),

RSPST,

Should it be necessary to limit the range of ratio adjustment of the

operator, the LIMIT instruction could be inserted between the RTOLD and

MUL steps as follows:

RTOLD( FIC–2 ),

LIMIT( HI_R_LMT ,LO_R_LMT ),

MUL(PVLD( FIC–1 )),

RSPST,

Finally, should it be necessary for the ratio value to track the actual ratio

between the two flows for bumpless transfer to RSP mode, the following

instructions could be used:

Without Limits

With Limits

SPLD( FIC–2 ), [1] SPLD( FIC–2 ), [1]

DIV(PVLD( FIC–1 )), DIV(PVLD( FIC–1 )),

RTOST, [2] LIMIT( HI_R_LMT ,LO_R_LMT ),

RTOLD( FIC–2 ), RTOST, [2]

MUL(PVLD( FIC–1 )), RTOLD( FIC–2 ),

RSPST, LIMIT( HI_R_LMT ,LO_R_LMT ),

MUL(PVLD( FIC–1 )),

RSPST,

NOTES:

[1] SP TRACKS PV IN MANUAL should be ENABLED to provide proper

tracking function.

[2] The RTOST function only writes to the ratio value when the loop is

not in RSP mode.

5.3 Register Conservation Techniques

When implementing complex control strategies, occasionally the number

of registers available in the controller may be a limiting factor. This

section will discuss FST coding techniques to reduce the number of

registers required to implement control strategies. The techniques

discussed will be the following:

H Loadable Functions

H Scratch Registers

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Response Electronics CL6011B Specifiche Pagina 265