4 MLX200 Programming Guide
4.4 Programming Pitfalls and Best Practices
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MLX200 Software and
Operations
4.4.4 Task Overlaps and CPU Load
MLX200 is designed to run on a variety of CompactLogix and
ControlLogix platforms including several older models/processors. On
some systems, the RSLogix application can become unresponsive if
application tasks (either MLX or other tasks) are taking up too much of the
CPU Load. There are two ways to check this. The first is to right-click on
the MLX Task, select Properties, and open the Monitor Tab (Fig.4-28
"Task Overlap Count"). This page contains a “Task Overlap Count” that
tells whether the task is executing in the proper amount of time. If this
value is non-zero, go to the Configuration Tab and increase the Task
Period until all overlaps go away.
Fig. 4-28: Task Overlap Count
RSLogix 5000 also has a tool called the Logix 5000 Task Monitor Tool that
can be used to further diagnose a system. The Task Monitor Tool is an
optional item during the RSLogix installation, but can be found for
download on the Rockwell website if needed. It can be started under the
Tool Menu.
Fig. 4-29: Logix 5000 Task Monitor Tool
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