> 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/standard-beginning.md).

# Standard beginning

The function block fbStandardBegin determines the start conditions for the step sequence and monitors the safe status to allow automatic or manual operation. This function block is a main component of every sequence and is located in the Selmo Basic library. **refHwzHmi** is the reference (pointer) to the variable list "[GVL\_\<HwZone\_name>\_HMI.stHmiIf](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221721-sthmihardwarezone)" **refHwzIf** is the reference (pointer) to the variable list "[GVL\_\<HwZone\_name>.stHwzIf](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221711-sthardwarezoneinterface)" **refSeqHmi** is the reference (pointer) to the variable list "[GVL\_\<Sequence\_name>\_HMI.stHmiIf](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221783-gvl_sequence1_hmi)" (stHmiSequence) **refSeqIf** is the reference (pointer) to the variable list "[GVL\_\<Sequence\_name>.stSeqIf](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221781-gvl_sequence1)" (stSequenceInterface) **xSeqSafetyModeOn** Query of the safety key switch "[GVL\_\<HwZone\_name>\_IOs.xSafetyFunctionKeySwitch](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#22173-gvl_hwzone1_ios)" **iSeqStepcounter** current step counter of the sequence "[GVL\_\<Sequence\_name>.iStepcounter](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221781-gvl_sequence1)" **aSeqPb** [Array of manual operation push buttons](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1) (HMI Buttons) is increased by one index per active HMI button per zone **aLampMatrix** [Array of the bit matrix](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1) (variable declaration) is increased by two indices per zone **aStepMatrix** [Array of the bit matrix](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1) (variable declaration) is increased by two indices per zone **aTempMatrix** [Array of the bit matrix](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1) (variable declaration) is increased by two indices per zone **aEocSteps** [Array of the bit matrix](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1) (Variable declaration) is increased by one index per step

Copy

```
// ########################### STANDARD BEGINNING ###########################
   {region "Description Standard Beginning"}
   (*
   The Standard Beginning determines the step sequence start up conditions and 
   monitors the safe status of the step sequence to allow Automatic or Manual operation
   *)
   {endregion}
   fbStandardBegin(
      refHwzHmi := GVL_<HwZone_name>_HMI.stHmiIf,
      refHwzIf := GVL_<HwZone_name>.stHwzIf,
      refSeqHmi:= GVL_<Sequence_name>_HMI.stHmiIf,
      refSeqIf := GVL_<Sequence_name>.stSeqIf, 
      xSeqSafetyModeOn := GVL_<HwZone_name>_IOs.xSafetyFunctionKeySwitch,
      iSeqStepcounter := GVL_<Sequence_name>.iStepcounter,
      aSeqPb := aPb, 
      aLampMatrix := aMatrix, 
      aStepMatrix := aStep, 
      aTempMatrix := aTemp,
      aEocSteps := aEocSteps); 
```

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