Technology instructions
10.3 Motion control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
761
The behavior of the status bits is presented below for various example situations.
● The first example shows the behavior of the axis for a completed task. If the motion
control task has been completely executed by the time of its conclusion, this is indicated
by the value TRUE in output parameter "Done". The signal status of input parameter
"Execute" influences the display duration in the output parameter "Done".
● The second example shows the behavior of the axis for an aborted task. If the motion
control task is aborted during execution, this is indicated by the value TRUE in output
parameter "CommandAborted". The signal status of the input parameter "Execute"
influences the display duration in the output parameter "CommandAborted".
● The third example shows the behavior of the axis if an error occurs. If an error occurs
during execution of the motion control task, this is indicated by the value TRUE in the
output parameter "Error". The signal status of the input parameter "Execute" influences
the display duration in the output parameter "Error".
Table 10- 83 Example 1 - Complete execution of task
If "Execute" = FALSE during the processing of the task
If "Execute" = FALSE after completion 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.
② While the task is active, the output parameter "Busy" indicates the value TRUE.
③ 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.
④ 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".
⑤ If "Execute" has been set to FALSE before the task is complete, "Done" indicates the value TRUE for only one execu-
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