Siemens S7-1200 System Manual page 498

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Technology instructions

9.3 Motion control

Example 1 - Complete execution of task

If "Execute" = FALSE during the processing of the task

The task is started with a positive edge at the input parameter "Execute". Depending on the programming, "Execute"

can still be reset to the value FALSE during the task, or the value TRUE can be retained until after completion of the task.

While the task is active, the output parameter "Busy" indicates the value TRUE.

With conclusion of the task (for example, for motion control instruction "MC_Home": Homing was successful), output

parameter "Busy" changes to FALSE and "Done" to TRUE.

If "Execute" retains the value TRUE until after completion of the task, then "Done" also remains TRUE and changes its

value to FALSE together with "Execute".

If "Execute" has been set to FALSE before the task is complete, "Done" indicates the value TRUE for only one

execution cycle.

If "Execute" = FALSE after completion of the task

System Manual, 03/2014, A5E02486680-AG

S7-1200 Programmable controller