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Parameter | Description |
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CD | Connection description |
EV | Definition of the enable mask for events. Default: "EV=ed".
If no events should be enabled, then specify "EV=". |
AT | Object attributes. Default: "AT=rw"
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RF | Refresh rate in ms. Default: "RF=1000".
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VT | Variable type (Data format description). Default in the process object: "VT=i32"
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VL | Variable 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). |
VN | The 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. |
AL | Structure 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. |
CM | Mode 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.
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VA | Variable addressing. Default: No variable addressing Using variable addressing, link objects can address subsets from the process data of a variable object. |
DV | The 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" |
HY | Assigned 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 |
FS | Assigned 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. |
UT | A 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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