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ParameterDescription
CD

Connection description

EVDefinition of the enable mask for events. Default: "EV=ed".
  • "e": Change in error state
  • "d": Change in data
  • "f": Change in data format
  • "c": Change in the connection description
  • "p": Progress information about active requests
  • "s": Status changes
  • 'u': Change in the user tag string
  • 'l': Special line events
Example: "EV=edfc"
If no events should be enabled, then specify "EV=".
ATObject attributes. Default: "AT=rw"
  • "r": Allows read access
  • "w": Allows write access
  • "e": PLC event operation
  • "h": Immediate write echo if access type POBJ_ACC_DATA
  • "d": Direct event trigger for the POBJ_EVENT_DATA event
RFRefresh rate in ms. Default: "RF=1000".
  • =-1: Cyclic data refresh is turned off
  • = 0: Data refresh is only carried out once
  • > 0: Cyclic data refresh is carried out with the specified refresh rate
VTVariable type (Data format description). Default in the process object: "VT=i32"
  • "i8", "i16", "i32", "i64": 8 to 64-bit signed integer
  • "u8", "u16", "u32", "u64": 8 to 64-bit unsigned integer
  • "f32", "f64": 32/64-bit floating point
  • "boolean": Flag with element length of 1 byte
  • "string": String with 8-bit character size
  • "wstring": String with 16-bit character size
  • "struct": Structure
  • "time": 32-bit time in ms since midnight
  • "dt": 32-bit date and time in seconds since 1/1/1968
  • "date": 32-bit date,
  • "tod". 32-bit time of day,
  • "datedata": General variable type with 1-byte element length
VLVariable length in bytes (data format description). This parameter can only be specified together with the VT parameter.
For single variables, the variable length corresponds to the process data length. For array variables, the variable length is defined as the element length. This parameter does not need to be specified when used in conjunction with variable types which have a fixed variable length (e.g. VT=i32 always has a variable length of 4 bytes).
VNThe number of elements in array variables (data format description). Default: VN=1. This parameter can only be specified together with the VT parameter.
VS

Optional additional specification of the variable type (Data format description). This parameter can only be specified together with the VT parameter.

The VS parameter provides additional information about the variable type (VT parameter), and does not affect how data is handled (data functions, type changes, etc.) in PVI. Each additional specification consists of one or more specification IDs ('a' - 'z'). The individual specification IDs are separated by semicolons (';'). The following additional specifications are currently defined: 'a' ... array variable, 'b' ... bit string, 'e' ... enumeration, 'v' ... derived data type.

ALStructure alignment. Default: "AL=1".
This parameter only takes effect in connection with variable type "VT=struct". Alignment values 1, 2, 4, 8, or 16 can be defined.
CMMode for type casting (cast mode). Default: "CM=0".
The mode is defined as a bit list and controls type casting between link and process objects.
  • Bit 0: String variable for PG2000 or AS 1.3
  • Bit 1: String contents are interpreted as a decimal number
  • Bit 2: Value range is monitored
  • Bit 3: Rounding takes place when casting type from a float to an integer
  • Bit 4: Strings are always terminated with 0 (null).
VAVariable addressing. Default: No variable addressing
Using variable addressing, link objects can address subsets from the process data of a variable object.
DVThe default value for single variables (process data).
This parameter can be used to assign a default data value to process variable objects of type Integer, Floating Point, Boolean, or String. If this parameter is specified, then a data format also has to be defined in the object description. This default value is only written to the process image but is not transferred to the PLC.
Examples: DV=123,  DV=2.561e10,  DV="string format"
HYAssigned event hysteresis. Default: No hysteresis
Definition of event hysteresis for single variables or array variables of type Integer or Floating Point. Event hysteresis is specified as a hysteresis value.
Examples: HY=10, HY=2.5
FSAssigned data function. Default: No function
Definition of a data function for single variables or array variables of type Integer or Floating Point. The data function is specified as a function description.
UTA user tag. With user tags, PVI applications can assign a private user code or specific user data to a process object (module, task, or variable object) in the form of a string. User tags are only managed by PVI, not evaluated.

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