Toshiba T2N User Manual download pdf (Page 225)

5. Programming Language

212 PROSEC T2N

The following is a description of the elements which compose an SFC

program.

(1) SFC Initialization

This is the function which starts-up (makes active) the designated

initial step by making the steps in a designated area inactive.

Either of the two methods of an SFC instruction or a ladder

diagram instruction is used. One SFC initialization is required for

1 SFC main program.

SFC Instruction

Operands: xx = Program number (0-63)

A = Start-up device (except T. and C.)

nnnn = Number of initialized steps (1-2048)

Function: When the device (with the exception of a timer device or

acounter device) designated by A changes from OFF to

ON, the number of steps following the initial step

(ssss)which are designatedby nnnn (from step number

ssss to ssss + nnnn - 1), are made inactive, and the initial

step (ssss) is made active.

Ladder Diagram Instruction

Input

–[ SFIZ (nnnn) ssss ]– Output

Operands: nnnn = Number of initialized steps (1-2048)

ssss = Step number of initial step (0-2047)

Function: When the input changes from OFF to ON, the initial step

the number of steps designated by nnnn from the step

number designated by ssss (from step number ssss to ssss

+ nnnn - 1), and made inactive, and the initial designated by

ssss is made active.

SFC Composition

Elements

This instruction connects to the

initial step

SFC initialization

Initial step

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 271 272

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Toshiba T2N User Manual Page 225