Siemens S7-1200 System Manual page 504

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9.3 Motion control

Example 3 - If an error occurs prior to reaching the parameterized velocity

If "Execute" = FALSE before the error occurs

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 the error has occurred.

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

An error occurred during task execution. When the error occurs, the output parameter "Busy" changes to FALSE and

"Error" to TRUE.

If "Execute" retains the value TRUE until after the error has occurred, then "Error" also remains TRUE and only

changes its status to FALSE together with "Execute".

If "Execute" has been reset to FALSE before the error occurs, "Error" indicates the value TRUE for only one execution

Under the following conditions, an error is not indicated in output parameter "Error":

• The parameterized velocity has been reached, input parameter "Execute" has the value

FALSE, and an axis error occurs (software limit switch is approached, for example).

• When the parameterized velocity is reached and input parameter "Execute" has the value

FALSE, the task is complete. After completion of the task, the axis error is only indicated

in the motion control instruction "MC_Power".

If "Execute" = FALSE after the error occurs

System Manual, 03/2014, A5E02486680-AG

S7-1200 Programmable controller