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Set the Position Units

You can set up the position units in the parameter screen of the Axis block.

Figure 5-14: Setting Axis Units

Some guidelines for suitable settings advises for a good choice is given below:

• The unit is adapted for the machine
• The unit must be meaningful for the user
• The same unit must be used for all related axes, for reasons of simplicity
• The unit must be set as soon as possible and must not be changed during the program lifetime, for reasons of consistency
• Speed is defined in User Units for position / second
• Acceleration in User Units for position / second²
• The unit must be related to the final moving object, instead of any intermediate part (e.g. the driven belt rather than the motor or axis shaft, which are intermediate parts)

Figure 5-15: Setting the Units - Example

A User Unit = 0.1mm could be selected for this transportation system

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