User manual

34 Publication LOGIX-AP010B-EN-P - May 2010
Chapter 2 Software Conversions - Program Structure
Event Task
Step 5 and RSLogix 5000 software allow tasks to be programmed that
interrupt the normal cyclic sequence and process the logic contained in
designated event task on detection of predefined event.
In Step 5, the predefined event is restricted to the change of state of an input
while RSLogix 5000 permits event tasks to be initiated on the following:
• Event Instruction
• Module Input Data State Change
• Consumed Data
• Motion Control Events
In Step 5, the code to be executed on detection of an interrupt event is
contained in predefined Organization Blocks. The number of event tasks that
can be programmed depends on the model of CPU in use.
In RSLogix 5000 software, the equivalent to the Event Task is indicated in an
RSLogix 5000 project as follows:
By right-clicking on this icon and choosing Properties, the following
configuration menu for the event task is displayed. From this menu, the event
that initiates the task can be determined and tasks priority can also be defined.