Read Device Identification VI

Installed With: LabVIEW

Reads Modbus object information stored on the device. This can include basic information, like manufacturer, additional standard items, or model-specific extended items. This function may take a large amount of time to execute, as it requires the transfer of a large quantity of binary data. Even on TCP/IP, this function is limited by the maximum defined size of a Modbus protocol data unit.

Read Device Identification

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object ID defines the specific ID to read. This input is only used if read device ID code is set to Read Specific

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read device ID code defines the type of read to be performed. If Read Basic is selected, this function will return the VendorName, ProductCode, and MajorMinorRevision. If Read Regular is selected, the previous objects will be returned along with, optionally, VendorUrl, ProductName, ModelName, or UserApplicationName. If Read Extended is selected, additional private objects may be returned, as defined by the manufaturer. Finally, Read Specific causes this function to only return the object defined by object ID. If a read type is selected which is higher than the capability of the device, it will return all objects possible. The only objects which are mandatory, if this function is supported by the device, are VendorName (0x00), ProductCode (0x01), and MajorMinorRevision (0x02). All other objects are optional.

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error out contains error information. This output provides standard error out functionality.

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The status boolean is either TRUE (X) for an error, or FALSE (checkmark) for no error or a warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.

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The code input identifies the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.

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The source string describes the origin of the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.

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error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

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The status boolean is either TRUE (X) for an error, or FALSE (checkmark) for no error or a warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.

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The code input identifies the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.

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The source string describes the origin of the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.

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Modbus slave out returns the Modbus slave instance provided as input.

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objects returns all Modbus data objects requested.

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Object ID

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Value

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Modbus slave in can accept any Modbus slave instance.