Technology instructions
10.3 Motion control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
767
Table 10- 88 Example 3 - If an error occurs prior to reaching the parameterized velocity
If "Execute" = FALSE before the error occurs
If "Execute" = FALSE after 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.
② While the task is active, the output parameter "Busy" indicates the value TRUE.
③ An error occurred during task execution. When the error occurs, the output parameter "Busy" changes to FALSE and
"Error" to TRUE.
④ If "Execute" retains the value TRUE until after the error has occurred, then "Error" also remains TRUE and only chang-
es its status to FALSE together with "Execute".
⑤ If "Execute" has been reset to FALSE before the error occurs, "Error" indicates the value TRUE for only one execution
Note
Under the following conditions, an error is not indic
ated 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".
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