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(* Test whether the keyword XXXX may be used as an identifier for:

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 * STEP, ACTION and TRANSITION name/identifier

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 *

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 * The XXXX names in the following code are merely a placeholder.

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 * They will be replaced by several identifiers before actual testing

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 * of the compiler.

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 *)

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(* The identifiers that will replace the XXXX

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 * must be placed on a line starting with #

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 * All identifiers preceded by # are ignored!

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 * The identifier list must be placed inside an IEC 61131-3 comment.

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 *)

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(*

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#IL_operators ANDN CAL CALC CALCN CD CLK CU IN JMP JMPC JMPCN 

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#IL_operators LD LDN ORN PT PV R R1 RET RETC RETCN S S1 ST STN XORN

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#SFC_qualifiers D DS L N P #R #S SD SL

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     NOTE: R and S are identical to IL operators!!

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#Task_initialisers PRIORITY SINGLE INTERVAL

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*)

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(* Use of XXXX as a STEP identifier *)

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PROGRAM bar01

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  VAR

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    IX1 AT %IX1 : BOOL;

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    IX2 AT %IX2 : BOOL;

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    IX3 AT %IX3 : BOOL;

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  END_VAR

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  INITIAL_STEP XXXX:

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  END_STEP

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  STEP STEP1:

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  END_STEP

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  STEP STEP2:

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  END_STEP

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  TRANSITION FROM XXXX TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  TRANSITION FROM STEP1 TO XXXX

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    := IX1 = TRUE;

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  END_TRANSITION

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  TRANSITION (PRIORITY := 4) FROM XXXX TO STEP2

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    := IX2 = TRUE;

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  END_TRANSITION

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  TRANSITION (PRIORITY := 4) FROM STEP2 TO XXXX

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    := IX2 = TRUE;

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  END_TRANSITION

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  TRANSITION transition_id1 FROM STEP2 TO XXXX

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    := IX1 = FALSE AND IX3 = FALSE;

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  END_TRANSITION

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  TRANSITION transition_id2 FROM XXXX TO STEP2

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    := IX1 = FALSE AND IX3 = FALSE;

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  END_TRANSITION

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  TRANSITION transition_id3 (PRIORITY := 3) FROM XXXX TO STEP2

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    := IX3 = TRUE;

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  END_TRANSITION

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  TRANSITION transition_id4 (PRIORITY := 5) FROM STEP2 TO XXXX

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    := IX3 = TRUE;

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  END_TRANSITION

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  TRANSITION FROM (XXXX, STEP2) TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  TRANSITION FROM (STEP2, XXXX) TO STEP1

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    := IX2 = FALSE;

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  END_TRANSITION

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  TRANSITION FROM STEP1 TO (XXXX, STEP2)

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    := IX1 = TRUE;

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  END_TRANSITION

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  TRANSITION FROM STEP1 TO (STEP2, XXXX)

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    := IX2 = TRUE;

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  END_TRANSITION

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END_PROGRAM

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(* Use of XXXX as a TRANSITION identifier *)

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PROGRAM bar02

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  VAR

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    IX1 AT %IX1 : BOOL;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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  END_STEP

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  TRANSITION XXXX FROM GO TO STEP1

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    := IX1 = FALSE AND IX3 = FALSE;

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  END_TRANSITION

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END_PROGRAM

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PROGRAM bar03

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  VAR

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    IX1 AT %IX1 : BOOL;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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  END_STEP

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  TRANSITION XXXX (PRIORITY := 3) FROM GO TO STEP1

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    := IX3 = TRUE;

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  END_TRANSITION

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END_PROGRAM

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(* Use of XXXX as an ACTION identifier *)

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PROGRAM bar20

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX ();

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar21

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(N);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar22

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(P);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar23

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(R);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar24

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(S);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar25

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(D, T#1s);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar26

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(L, T#1s);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar27

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(DS, T#1s);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar28

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(SD, T#1s);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar29

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(SL, T#1s);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar30

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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    XXXX(L, delta_1);

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  END_STEP

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  TRANSITION FROM GO TO STEP1

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    := IX1 = FALSE;

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  END_TRANSITION

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  ACTION XXXX:

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    QX1 := TRUE;

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    QX2 := TRUE;

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  END_ACTION

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END_PROGRAM

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PROGRAM bar31

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  VAR

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    QX1 : BOOL := 1;

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    QX2 : BOOL := 0;

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    QX3 : BOOL;

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    IX1 : BOOL;

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    IX2 : BOOL;

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    IX3 : BOOL;

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    delta_1 : TIME := T#1s;

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  END_VAR

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  INITIAL_STEP GO:

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  END_STEP

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  STEP STEP1:

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