If ... Else ... Endi Structure; Repeat ... Until Structure - HEIDENHAIN iTNC 530 HSCI Technical Manual

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9.14.1 IF ... ELSE ... ENDI structure

The IF ... ELSE ... ENDI structure permits the alternative processing of two

program branches depending on the value in the logic accumulator. The ELSE

branch is not mandatory. The following commands are available:

IFT (IF LOGIC ACCU TRUE):

Following code only if logic accumulator = 1

IFF (IF LOGIC ACCU FALSE):

Following code only if logic accumulator = 0

ELSE (ELSE):

Following code only if IF is not fulfilled

ENDI (END OF IF STRUCTURE):

End of the IF structure

Load input I0 into the logic accumulator

Run the following code if logic accumulator = 1

Program code for I0 = 1

Run the following code if logic accumulator = 0;

command can be omitted

Program code for I0 = 0, can be omitted

End of the conditional processing

The REPEAT ... UNTIL structure repeats a program sequence until a condition

is fulfilled. Under no circumstances can you wait with this structure in the

cyclic PLC program for the occurrence of an external event! The following

commands are available:

REPEAT (REPEAT):

Repeat the program sequence from here.

UNTILT (UNTIL TRUE):

Repeat the sequence until the logic accumulator = 1.

UNTILF (UNTIL FALSE):

Repeat the sequence until the logic accumulator = 0.

The iTNC runs a REPEAT ... UNTIL loop at least once!

Assign the content of the logic accumulator to

marker 100; conclusion of the previous commands

Repeat the following program code

Program code to be run

Load the index register

Check the index register

Repeat until X >= 100

9.14 Program Structures