Adding a digital 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 Digital.
    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.
    Machine
    The machine associated with the OPC item
    Action
    The action to perform when the OPC item value changes. This field can be blank if an action, other than the standard OPC item type action, is not required.
    Formula
    An expression that defines how to calculate the OPC item value based on other OPC items. This field is optional and can be blank if necessary.
    Digital Type
    The OPC digital type to collect. Possible values:
    • Machine Event: A machine event linked to a machine event type is recorded.
    • Process Parameter: A Binary or Boolean value (for example: 0, 1, true, or false) is recorded.
    Event Type
    The specific machine-event type to generate. This field is enabled only if the Digital Type field is set to Machine Event.
    Type
    The type of transition required to record a machine event. This field is enabled only if the Digital Type field is set to Machine Event. Possible values:
    • On data change: A machine event is recorded when the OPC item value changes.
    • On data condition match: A machine event is recorded when the OPC item value changes to a defined value.
    OPC Alarm?
    If this check box is selected, an alarm is triggered when the machine event is recorded.
  4. Click OK.