Rockwell Automation GMLC Reference Manual - Manual (Page 891)

Publication GMLC-5.2 - November 1999
854 CPU Utilization
3. Select OK.
Example
The Control Setting block parameters, shown above, set the servo update
rate to 800 Hz, resulting in 1.25 ms between clock ticks.
The change takes effect immediately, and you can then examine the new
CPU Utilization value as explained earlier. The Servo Update Rate is not
axis-specific; the same rate is used by all axes.
A good rule of thumb is to reduce the servo update rate in increments of
100 Hz until the CPU utilization is less than the threshold values given
previously. When you have settled on the required rate, adjust the data
parameter by executing one last Control Settings block, selecting Set to
Power-up Value, thereby making the change permanent.
In addition, once the optimal servo update rate has been determined, this
value should be set in the General page of the Configure Control Options
dialog box. This way, if the controller ever needs to be initialized or
exchanged, the servo update rate is set correctly in the new controller.
Value Select Working.
Tag Explorer Select Data Parameters.
Tag Window Select Servo Update Rate.
State • Select Set To.
• Type the rate in Hz.
Field Description