Ownership

Ownership is having the right to command an
Equipment Sequence
 or an
Equipment Phase
.
Both
Equipment Sequence
s and
Equipment Phase
s must be owned to be commanded. The ownership commands are Attach (SATT) and Detach (SDET).
Internal sequencers (programs), external sequencers (
FactoryTalk Batch
), and operators always use an Attach instruction to command an
Equipment Sequence
.
Logix Designer
 always uses an Override instruction to command an
Equipment Sequence
. A program might successfully attach an
Equipment Sequence
 but be unable to command it because
Logix Designer
 has overridden ownership.
The ownership override commands are:
  • Attach:
     Operators, internal sequencers, and external sequencers attach to an
    Equipment Sequence
     or
    Equipment Phase
     to control it.
  • Override:
     A
    Logix Designer
     application always takes ownership of an
    Equipment Sequence
     or
    Equipment Phase
     by overriding an existing
    Attach
    .
  • Detach: Operators, internal sequencers, external sequencers, and
    Logix Designer
    . Detach to release the right to control the
    Equipment Sequence
     or
    Equipment Phase
    .
If the
Equipment Sequence
 is attached by another sequencer, an external sequencer, or an operator, an
Override
 takes precedence without waiting for other owners to release the
Equipment Sequence
. Any existing attachment remains and resumes control once the
Override
 is gone.
If the
Equipment Phase
 is attached by an
Equipment Sequence
, an
Override
 interrupts the
Equipment Sequence
's ability to coordinate the
Equipment Phase
. This is a sequencing failure condition and the
Equipment Sequence
 is HELD.
Only one attachment is allowed on an
Equipment Phase
 or
Equipment Sequence
. If the
Equipment Phase
 or
Equipment Sequence
 is not already attached to, attaching will grant the attaching sequencer ownership (and commanding privilege). If the
Equipment Phase
 or
Equipment Sequence
 is already attached to, then other potential owners trying to attach to the same
Equipment Phase
 or
Equipment Sequence
 fail.
Ownership types
Ownership types are the ways a sequence or phase may be owned--enabling the owner to command them. Each ownership type is stored independently on the phase or sequence so one type of ownership does not remove another.
Relative Priority
Ownership Type
# Allowed
Description
First
Logix Designer
 Override
Up to 15
Logix Designer
 application always takes ownership by overriding all other potential users. Up to 15 different
Logix Designer
 applications may attach to a single Equipment Phase or Equipment Sequence at one time.
Second
Attach
1
A request to attach fails if the
Equipment Sequence
 or
Equipment Phase
 is already attached.
Ownership user types
There are four user types:
Logix Designer
, External Sequencer, Internal Sequencer, and Operator. The attachment type accompanies an attach request to take ownership.
Types of users
Description
Examples
Logix Designer
A control engineer using
Logix Designer
 overrides ownership of the
Equipment Phase
 or
Equipment Sequence
.
Equipment Phase
 Monitor within
Logix Designer
Sequence Editor within
Logix Designer
Internal Sequencer
A program running within a
ControlLogix
 controller.
Programs, Equipment Sequences, Equipment Phases
Operator
An operator logged into a FactoryTalk View Site Edition display interacting with
Equipment Sequence
 through the
SequenceManager
 Controls.
When an attachment of Operator type exists, all operator displays may command the
Equipment Sequence
.
Sequence Detail, Sequence Summary
External Sequencer
An application outside
ControlLogix
 that interacts with sequenced objects.
FactoryTalk Batch
 Server
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