> For the complete documentation index, see [llms.txt](https://infosys.selmotech.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://infosys.selmotech.com/selmo-solution/selmo-solution-en/selmo-structure-and-standard/selmo-technical-standard-and-structure/description-selmo-plc-code/sequence-logic/less-than-sequence_name-greater-than/structure-less-than-sequence_name-greater-than/variable-declaration-standard-structure.md).

# Variable declaration standard structure

**Variable declaration** When defining steps and zones, the required variables are automatically declared.

↓ Generated declaration

Copy

```
PROGRAM Sequence1
VAR
   {attribute 'symbol' := 'none'}
   aMatrix: ARRAY[0..48] OF BOOL;
   {attribute 'symbol' := 'none'}
   aTemp: ARRAY[0..48] OF BOOL;
   {attribute 'symbol' := 'none'}
   aStep: ARRAY[0..48] OF BOOL;
   aPb: ARRAY[0..19] OF BOOL;
   aCmz: ARRAY[0..5] OF BOOL;
   aEocSteps: ARRAY[0..7] OF INT;
   aZ1: ARRAY[1..16] OF eZoneOperand;
   aZ2: ARRAY[1..16] OF eZoneOperand;
   aZ3: ARRAY[1..16] OF eZoneOperand;
   aZ4: ARRAY[1..16] OF eZoneOperand;
   aZ5: ARRAY[1..16] OF eZoneOperand;
   aZ6: ARRAY[1..16] OF eZoneOperand;
   aZ7: ARRAY[1..16] OF eZoneOperand;
   aZ8: ARRAY[1..16] OF eZoneOperand;
   aZ9: ARRAY[1..16] OF eZoneOperand;
   aZ10: ARRAY[1..16] OF eZoneOperand;
   aZ11: ARRAY[1..16] OF eZoneOperand;
   aZ12: ARRAY[1..16] OF eZoneOperand;
   aZ13: ARRAY[1..16] OF eZoneOperand;
   aZ14: ARRAY[1..16] OF eZoneOperand;
   aZ15: ARRAY[1..16] OF eZoneOperand;
   aZ16: ARRAY[1..16] OF eZoneOperand;
   aZ17: ARRAY[1..16] OF eZoneOperand;
   aZ18: ARRAY[1..16] OF eZoneOperand;
   aZ19: ARRAY[1..16] OF eZoneOperand;
   {attribute 'symbol' := 'none'}
   fbCmzFault: FB_CmzFault;
   fbStandardBegin: FB_SeqStandardBegin;
   {attribute 'symbol' := 'none'}
   fbStandardEnd: FB_SeqStandardEnd;
   {attribute 'symbol' := 'none'}
   aStepMonitoringFb: ARRAY[1..16] OF stStepMonitoringFB;
   {attribute 'symbol' := 'none'}
   fbZone1: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone2: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone3: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone4: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone5: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone6: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone7: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone8: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone9: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone10: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone11: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone12: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone13: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone14: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone15: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone16: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone17: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone18: FB_Zone;
   {attribute 'symbol' := 'none'}
   fbZone19: FB_Zone;
   nHmiStoredLoopCounter: INT;
   fbTon2: TON;
   {attribute 'symbol' := 'none'}
   aCrossZone1: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone1: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone1: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone2: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone2: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone2: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone3: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone3: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone3: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone4: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone4: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone4: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone5: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone5: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone5: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone6: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone6: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone6: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone7: ARRAY[0..1] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone7: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone7: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone8: ARRAY[0..1] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone8: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone8: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone9: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone9: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone9: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone10: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone10: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone10: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone11: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aCondZone12: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aCrossZone13: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone13: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone13: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone14: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone14: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone14: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone15: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone15: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone15: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone16: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone16: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone16: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone17: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone17: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone17: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone18: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone18: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone18: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCrossZone19: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   aCondZone19: ARRAY[0..0] OF BOOL := [0(TRUE)];
   {attribute 'symbol' := 'none'}
   aPaircheckZone19: ARRAY[0..0] OF BOOL;
   {attribute 'symbol' := 'none'}
   fbErrorSetCtrl0: FB_ErrorSetCtrl;
   {attribute 'symbol' := 'none'}
   fbErrorSetCtrl1: FB_ErrorSetCtrl;
   {attribute 'symbol' := 'none'}
   fbErrorSetCtrl2: FB_ErrorSetCtrl;
   {attribute 'symbol' := 'none'}
   fbErrorSetCtrl3: FB_ErrorSetCtrl;
   {attribute 'symbol' := 'none'}
   fbErrorSetCtrl4: FB_ErrorSetCtrl;
   {attribute 'symbol' := 'none'}
   fbErrorSetCtrl5: FB_ErrorSetCtrl;
END_VAR
```

**HMI buttons** In this section the [HMI manual buttons](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221783-gvl_sequence1_hmi) of the zones of the push-button matrix are assigned. This enables manual operation of the zone when it has been activated as an HMI button in the Studio.

Copy

```
// --------------------------- HMI buttons ---------------------------
   aPb[8] := GVL_<Sequence_name>_HMI.xManBtn_Zone_9;
   aPb[9] := GVL_<Sequence_name>_HMI.xManBtn_Zone_10;
   aPb[10] := GVL_<Sequence_name>_HMI.xManBtn_Zone_11;
   aPb[11] := GVL_<Sequence_name>_HMI.xManBtn_Zone_12;
```

**End-of-cycle steps** In this section the end-of-cycle steps that were defined in the Studio in the logic layer are assigned. These are then passed to the **Standard Beginning**function block.

Copy

```
	aEocSteps[0] := 3;
	aEocSteps[1] := 7;
	aEocSteps[2] := 13;
	aEocSteps[3] := 29;
	aEocSteps[4] := 36;
	aEocSteps[5] := 42;
	aEocSteps[6] := 49;
	aEocSteps[7] := 56;
```


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