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4Ć24 FST Configuration

Original Ć June 1990CE4.2:CL6211

4.4 Function Sequence Table (FST)

An FST is the algorithm that runs under each direct control point and is

constructed of individual functions (instructions) that are linked together to

create a control strategy. The instructions are selected from a predefined

library of instructions stored in the controller. These individual instructions

are entered on the DCP FST form using the Instruction Editor (refer to the

ENVOX User's Manual for more information on the Instruction Editor).

Each DCP defined for a controller must be placed in a separate loop of the

FST. Each loop in the FST must begin with the LOOP instruction and end

with the END instruction. Each loop in the FST can contain up to 100 steps.

The maximum total steps for all loops is 200 for the Computing controller

and 250 for the Interactive controller.

The FST instructions in this section are listed in alphabetical order. To

simplify locating an instruction which will perform a particular function,

Table 4Ć5 contains an index of FST instructions listed by function type.

There are 12 major function groups: mathematical functions, logic functions,

conversion functions, loop mode functions, operating data load/store

functions, general register load/store functions, time related functions, PCA

modifier functions, input/output functions, operator station functions, loop

housekeeping functions, and feedforward functions.

Most FST instructions consist of the function mnemonic and one or more

operands. Refer to the following section for a complete list of FST

mnemonics, operands, and descriptions of each instruction. Operands can

be analog and discrete values, register names, and other alphanumerics that

relate the individual functions to other functions or to important controller

and loop parameters. Some functions accept analog and discrete loadable

functions as an operand. A list of loadable functions is provided in Table 4Ć6.

Loadable functions are used to reduce the number of FST steps required to

define an FST for certain control strategies.

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