Unit ID - expanded explanation for tables

A Sequence Chart has two Unit ID properties:
  • Configured Unit ID
  • Unit ID

Configured Unit ID

  • The Configured Unit ID is set in the
    Logix Designer
     application in the
    Equipment Sequence Properties Configuration
     tab.
  • When a Sequence is created, the Configured Unit ID is set to 0.
  • When the Configured Unit ID is changed, the Unit ID is set with the new Configured Unit ID if these conditions are true:
    • The Sequence state is Idle.
    • No external attachment is present.
    • No internal attachment is present.
    • No Start command is present.

Unit ID

The Unit ID is:
  • Included in the Sequence backing tag.
  • Set to the Configured Unit ID when the Sequence state returns to idle.
  • Set to the Configured Unit ID when the controller is powered on or power cycled.
  • Set to the Configured Unit ID when the controller changes from Program to Run mode if no external sequencer is attached to the Sequence.
  • Set to the Configured ID after a switchover if these conditions are true:
    • Its Sequence state is Idle.
    • No Internal owner is attached.
    • No Start command is present.
  • Included in the Event Log when a Sequence starts.
  • Set by an External Sequencer when the External Sequencer attaches to the sequence if the Sequence state is Idle.
  • Set to the Configured Unit ID when an External Sequencer detaches from the Sequence if these conditions are true:
    • The Sequence state is Idle.
    • No Start command is present.
  • Set to the Configured Unit ID when an External Sequencer connection is lost if these conditions are true:
    • The Sequence state is Idle.
    • No Start command is present.
  • Set to the value in the Unit ID parameter of the SATT (Sequence Attach) instruction when an Internal Sequencer attaches to a Sequence with the SATT instruction.
  • Set back to the Configured Unit ID when an Internal Sequencer detaches from a Sequence with the SDET (Sequence Detach) instruction.
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