Equipment Phase
An Equipment Phase Functions Much Like a
Program.
can be executed within any task, except for Safety tasks
 contain and execute multiple routines, including normal
subroutines, prestate routines, fault routines, or routines
 containing the logic for different states of an equipment
phase
 can make use of the Max Scan and Last Scan timing
functions
 can have locally-scoped tags associated with them

Equipment Phase
Behavior of the Equipment
Phase
It
is a state machine which that maps out how how
the equipment phase operates.
The
equipment phase enforces the transitions
between states and executes the appropriate state
routine.
When
the equipment phase is in the Running state,
it executes the Running routine. If it is in the Holding
state, it executes the Holding routine.
Equipment Phase States and
Transitions
Type Routine States
You can create state routines for any of the
active states of the equipment phase. The
active states include:
 Aborting
 Holding
 Resetting
 Restarting
 Running
 Stopping
Programming Phase
Equipment Routines
You can write logic (i.e., code in RLL, SFC, STX, or FBD) for
each state. This logic is referred to as phase logic.
PhaseManager feature provides several instructions to support
phase logic.
You do not have to implement every active state. A equipment
phase, controller scoped tag with the same name as the
equipment phase is created. This tag is of the PHASE data type
and cannot be renamed or deleted. To further delineate this
special tag as an equipment phase tag, a ":Phase" is appended
to the name. This tag contains information on the state,
substate, owner, and other data related to the equipment
phase. As the equipment phase executes, it updates this tag
with its current state information.
Equipment Phase Tags
Sequencers
Applications and programs can control the execution of
equipment phases by sending them commands. These
applications are referred to as sequencers. There are four
types of sequencers that can command an equipment phase:
Internal Sequencer – a Logix program that uses instructions
to command the equipment phase

External Sequencer – a PC-based application that
commands the equipment phase via CIP message

– an RSView SE or ME station that commands the
equipment phase via CIP.
HMI
RSLogix 5000 – the command toolbar and phase monitor
window send commands to the equipment phase

Sequencer Ownership
The equipment phase accepts commands from the
sequencer type that is its current owner. A
sequencer typically first takes ownership, then
commands the equipment phase, and finally
releases ownership. For more details on ownership,
refer to the PATT and PDET instructions or the
Monitoring and Commanding Equipment Phases
section.
Input and Output Parameter
Tags
Input and/or output parameter tags are configure to further modularize
the equipment phase and to document the required or expected inputs
and outputs. Parameter tags provide a mechanism for sequencers to
store input values and retrieve output values while commanding the
equipment phase. If the equipment phase has parameter tags, the
sequencer typically performs the following operations:
 Take ownership of the equipment phase
 Write the input parameter values to the equipment phase’s tags
 Command the equipment phase (e.g. Start)
 Wait for the equipment phase to complete (or reach another terminal
state such as Stopped or Aborted)
 Read the output parameter values from the equipment phase’s tags
 Release ownership of the equipment phase