OnCommError

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OnCommError

OnCommError(EvtType, Size, Element, N1, N2, N3, N4)

Occurs when an I/O Driver detects any writing or reading error. Use an OnCommError event to check when a writing or reading failure occurred. Event variables receive information about this error. With these values, users can track back Tags with I/O problems.

OnCommError event variables

Name

Description

EvtType

Informs which type of operation an I/O Driver was performing when this error occurred, according to the following options:

0: Single I/O Block Element reading error (Size = 1). Param1 is N1, Param2 is N2, Param3 is N3, and Param4 is N4

1: Single I/O Block Element writing error (Size = 1). Param1 is N1, Param2 is N2, Param3 is N3, and Param4 is N4

2: I/O Block reading error. Size is determined by the number of I/O Block Elements. Param1 is N1, Param2 is N2, Param3 is N3, and Param4 is N4

3: I/O Block writing error. Size is determined by the number of I/O Block Elements. Param1 is N1, Param2 is N2, Param3 is N3, and Param4 is N4

Size

Number of values being read or written

Element

Index of the I/O Block Element being read or written inside an I/O Block

N1

First parameter of a reading or writing operation that generated this error

N2

Second parameter of a reading or writing operation that generated this error

N3

Third parameter of a reading or writing operation that generated this error

N4

Fourth parameter of a reading or writing operation that generated this error

 

Example:

Sub Driver1_OnCommError(Type, Size, Element, N1, N2, N3, N4)
  Application.GetObject("Data.InternalTag1").Value = _
    Application.GetObject("Data.InternalTag1").Value + 1
  Application.GetObject("Data.EvtType").Value = EvtType
  Application.GetObject("Data.Size").Value = Size
  Application.GetObject("Data.Element").Value = Element
  Application.GetObject("Data.N1").Value = N1
  Application.GetObject("Data.N2").Value = N2
  Application.GetObject("Data.N3").Value = N3
  Application.GetObject("Data.N4").Value = N4
End Sub

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