Network Variables

A Network Variable (NV) is a data item such as a temperature, a switch value or actuator state. NVs can be thought of simply as point parameters. LonMark functional profiles define Standard Network Variable Types (SNVTs), but additional non-standard NVs are usually available, depending on the device, to store additional non-standard data.

There are two categories of NVs that the Honeywell Spyder supports. They are:

The following is a list of mandatory and fixed NVs supported by Spyder.

NvName Data Type NV Type
nroPgmVer UNVT_pgmVer Mandatory
nvoNodeStatus SNVT_obj_status Mandatory
nviFileRequest SNVT_file_req Mandatory
nvoFileStatus SNVT_file_status Mandatory
nviFilePos SNVT_file_pos  Mandatory
nviNodeRequest SNVT_obj_request Mandatory
nvoConfigError UNVT_configError Mandatory
nciApplVerNew UCPT_applVerNew Mandatory
nviDebugIndex UNVT_debugIndex Mandatory
nvoDebug1 UNVT_debug Mandatory
nvoDebug2 UNVT_debug Mandatory
nciDeviceName UCPT_devName Mandatory
nviInUse UNVT_inUse Mandatory
nvoAlarmH UNVT_alarm Mandatory
nvoAlarmStatus UNVT_alarmStatus Mandatory
nvoError UNVT_error Mandatory
nciAlarmInhibit UCPT_alarmInhibit Mandatory
nciSndHrtBt SCPTmaxSendTime Mandatory
nciRcvHrtBt SCPTmaxRcvTime Mandatory
nvoWMCommError UNVT_WMCommError Mandatory
nciUICalOffset UCPT_uiCalOffset Fixed
nviTimeSet SNVT_time_stamp Fixed
nvoTime SNVT_time_stamp Fixed
nvoIO1 UNVT_io1 Fixed
nvoIO2 UNVT_io2 Fixed
nvoIO3 UNVT_io3 Fixed
nviManVal UNVT_manVal Fixed

Note: Make sure that Mandatory and Fixed NVs should be created as per the model selected. If you expose the point of such fixed or droppable NVs which are removed in the next selected model ( the reason could be that the next selected model does not support the NV) then that point becomes an invalid point. Note: The Spyder tool permits downloading or uploading network and internal data type information of all NV fields.

The LonSpyder provides the following four built-in functions that enable you to connect function blocks with other function blocks.

The Honeywell Spyder provides built-in functions, Network Variable Inputs, to allow the selection of variables that are available from/to the network. The configured network variables are mapped to the Function Block memory space to be used by any Function Block. Each Network variable may be configured with a name.

Viewing the List of Network Variables

  1. Browse to Station > Config > Drivers > LonNetwork > LonSpyder.
  2. Select ControlProgram> Views > NV Configuration View. The summary page appears with a list of pre-programmed Mandatory, Fixed, and Custom NVs in a tabular format.

The table has the following columns:

  1. The bottom half of the NV Configuration view displays the software points available on the wiresheet in a tabular format.

The table has the following columns:

Note:

Related Topics

Add NVI

Add NCI

Add NVO

Add Many to One NV

Edit NV

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