Technical data

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CPU 317T: Technology Functions
8-8 A5E00251798-03
8.4 Assigning technology system cycles
Best practice in tuning power resources of the integrated technology is to set
priorities for your Motion Control tasks (technology objects), and assign these
directly to the technology system cycles. By defining tasks to low priority classes,
you release performance resources for higher-priority tasks.
Change the default settings,
• if the time to a command execution is too long
• if load on the technology is too high (the processing times are available in the
technology DB MCDevice.)
Assign the technology objects "axis" and "external encoder" with low-priority tasks
to "interpolator cycle2", the technology objects "output cam" and "measuring
sensor" to "interpolator cycle" or "interpolator cycle2". Assign the technology
objects "cam" and "measuring sensor" with tasks of a higher priority class to the
"interpolator cycle" or to the "position control cycle".
The technology objects can be assigned the cycles listed below:
Motion Control
command
high priority ... low priority
Technology object Position controller
cycle
Interpolator cycle Interpolator cycle 2
Velocity-controlled
axis
- Default X
Positioning axis - Default X
Synchronization axis - Default X
External encoder - Default X
Output cam X X X
Measuring input X X X
Assignment of system clocks
• The technology system cycles of cams and measuring sensors are set in the
Configuration dialog box of S7T Config.
• For the axes and external encoders these are set at the
Execution.ExecutionLevel variable in the expert list of S7T Config.
Warning
The technology objects listed below must be clocked at the same frequency:
• Synchronized leading / following axes
• Measuring sensors and cams at the axis