Tasks, Programs and Equipment Phases

• An event task in Logix is similar to the processor input interrupt (PII) in the PLC-5. Multiple event tasks can exist in the controller, each configured to execute at the initiation of independent triggers.
• A periodic task in Logix is similar to the selectable timed interrupt (STI) in the PLC-5. Multiple periodic tasks can exist in the controller, each configured to execute at independent rates.
• Double-click on a state in an Equipment Phase to navigate to the logic for that state.
• Use RSBizWare Batch software to create Equipment Phases. Use the Equipment Editor to create the phases, define parameters, and synchronize the phases with an RSLogix 5000 project.
• Use any programming language (Ladder, Structured Text, FBD, or SFC) to program state routines in Equipment Phases.
• The fault routine for an Equipment Phase is the same as the fault routine for a program. Use a fault routine to allow logic to run before the controller faults due to a programming error.
• The Prestate routine runs all the time, even when the Equipment Phase is not active.
• The Prestate routine for an Equipment Phase is optional. Use the Prestate routine to execute the error detection logic for your phases.
• You don't have to implement all the available states in an Equipment Phase. On the Equipment Phases properties, check the "Complete State if not implemented" option.
• In the Phase Monitor, the states you can write code have action names and have a command word leading into the state, such as Start leads to the Running state. You add routines to these states. Waiting states don't require routines. The phase waits for a command to move to the next state. For example, Idle and Hold.