Rockwell Automation GMLC Reference Manual - Manual (Page 886)

Publication GMLC-5.2 - November 1999
Chapter
41
CPU Utilization
Two of the most valuable features of the controllers are the
CPU_utilization variable, and the CPU_utilization_peak variable.
The CPU_utilization variable shows how much of the motion controller’s
CPU (Central Processing Unit, or microprocessor) capacity is being used
to generate and control motion, and thus how much is left for program
execution and external communication (RIO, SLC, DH-485, AxisLink I/
O Read Remote, and Serial Ports.). If CPU Utilization gets too high,
program execution and communication slow down dramatically,
adversely affecting application performance.
The CPU_utilization_peak variable (enabled only in iCODE versions 3.5
and higher) displays the historic high value for the CPU_utilization value.
This value is reset at power up, and when you press the motion
controller’s Reset.
To monitor the current CPU Utilization and CPU Utilization Peak
variables:
1. Be sure you are operating Online by selecting the Online Connect
button in the Online Toolbar, (or by selecting Online Connection in
the Diagram Menu, or by pressing F8).
2. Select General System Variables in the Tag Explorer.
3. In the Tag Window, scroll down to the CPU_utilization and
CPU_utilization_peak variables, as shown below.
Tag Explorer Tag Window