> 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/sequence-logic-control/zone-call/general-parameters-of-the-zone.md).

# General parameters of the zone

fbZone\*.**P\_iIndexOfLamp** describes the index of the zone in the array [aLampMatrix](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1) (variable declaration). This index is unique fbZone\*.**P\_iIndexOfPaircheckLamp** describes the index of the zone in the array [aLampMatrix](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1) (variable declaration) if a paircheck was activated. This index is unique fbZone\*.**P\_xInputPolarity** determines whether it is a normal or an inverted zone. That is, the zone's input signal can be queried either True or False fbZone\*.**P\_xIsSystemZone** is used for internal zones that are required, for example, for a decision, timer step, repeater, etc. fbZone\*.**P\_xOutputOpposite** causes a locking of the outputs when they are in the same paircheck group. fbZone\*(**xNoPBPressed**) query no pushbutton was pressed "[GVL\_\<Sequence\_name>.stSeqIf.xSeqNoPBpressed](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221781-gvl_sequence1)" (stSequenceInterface) fbZone\*(**xAutomaticRelease**) query automatic release is enabled "[GVL\_\<Sequence\_name>.stSeqIf.xSeqAutomaticReleased](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221781-gvl_sequence1)" (stSequenceInterface) fbZone\*(**iActualStepCounter**) 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)" fbZone\*(**aZone**) For each zone there is an array ([(aZ1, aZ2](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221786-sequence1), …) (operands) which maps for each step (index) the operand from the system layer fbZone\*(**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 fbZone\*(**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 fbZone\*(**aMonMatrix**) [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) data is stored for the zone to be monitored. "[GVL\_\<Sequence\_name>\_HMI.aHmiMon](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221783-gvl_sequence1_hmi)" fbZone\*(**aMonBuffer**) In this array data is stored for the zones to be monitored. "[GVL\_\<Sequence\_name>\_HMI.aHmiMonBuffer](https://selmo-technology-gmbh.gitbook.io/selmo-solution/02-selmo-standard/04-selmo-plc-code/contents#221783-gvl_sequence1_hmi)" fbZone\*(**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


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