Adding a meter OPC item

  1. Select Configuration > OPC > OPC Items. The OPC Items screen is displayed.
  2. Click Add. The Add window is displayed.
  3. Specify this information on the OPC Item tab:
    OPC Item Type
    The type of OPC item must be set to Meter.
    Meter Item
    The meter to link the OPC item to.
    Tag Name
    The name of the OPC item.
    Address
    The tag’s address in the OPC server.
    Description
    The description of the OPC item.
    OPC Server
    The OPC server used for reading and writing tags in the from and to fields.
    OPC Group
    The OPC group to which the tag is assigned.
    Action
    The action to perform when the OPC item value changes. This field can be left blank if you do not wish to perform any actions besides the standard OPC item type action.
    Lookup Job Details
    If this check box is selected, details of jobs running for the machine are retrieved and transferred to the action. The application performance can be improved if this check box is cleared, however, must be enabled if the OPC data relates to job specific information, events, calculations, or triggers.
    Offset
    An offset value that is applied to incoming OPC data. The offset value is not applied if this field is set to 0.
    Formula
    An expression that defines how to calculate the OPC item value based on other OPC items. This field is optional and can be left blank if necessary.
    Multiplier
    A multiplication factor applied to the OPC item for scaling. The multiplier is not applied if this field is set to 1.
    Acceptable Rate Of Change
    The maximum allowed rate of counts per second. Any values above the limit are automatically ignored.
    Convert From Raw Value
    If this check box is selected, the OPC value is treated as a raw counter and reset to zero once reaches to the maximum value.
    Delta Mode
    Indicate how the changes to the delta values are to be interpreted in the OPC counter. Possible values:
    • Interpret negative movement as roll-over: The rollover value (high value) is used to calculate the difference. The counter cannot be negative.
      Note: If the counter is reset manually, a rollover occurs at the high-value threshold, producing an incorrect large number.
    • Allow negative movements: Allows application to record the negative counts.
  4. Click OK.