Manual Teach-In Run; Saving The Teach-In Data; Validity Of Teach-In Data Based On Parameter Changes - Festo VTEM Description, Function, Parameterisation

Function
2.7.4.2 Manual teach­in run
After the teach-in run mode (è 2.7.2.1 Selection of the teach-in run mode) has been set to "Execute
manual teach-in run", the drive can be moved between the end positions using the control for the
manual teach-in run (è 2.7.3 Return values).
The process can be observed using the "status of the teach-in run" (è 2.7.3.2 Status of teach-in run).
The teach-in run is completed when the "status of the teach-in run" changes to the value "14" (com-
pleted).
2.7.5 Saving the teach­in data
The teach-in data and reference values determined during the teach-in run are automatically saved in
the active parameter set on the Motion Terminal controller as persistent data.
While the Motion App is running, the teach-in data are continuously reviewed and adjusted if appro-
priate. These adjustments are also saved directly as persistent data.
2.7.6 Validity of teach­in data based on parameter changes
In the event of a change to the system, application and/or tuning parameters, the teach-in data and
reference values are discarded, as in this case it must be assumed that they no longer match the modi-
fied configuration.
Therefore, following the change to the system, application and/or tuning parameters in a parameter
set, a new teach-in run must be executed for the Motion App affected by the changes.
The teach-in data and reference values are also reset if the system, application and/or tuning para-
meters, which are always the same, are transferred from the higher-order controller at system start
but have never been saved as persistent data on the Motion Terminal controller.
In this case, the Motion Terminal starts with the default values for the parameters. As soon as these
are overwritten by the higher-order controller, this change to the parameters causes the teach-in data
and reference values to be discarded.
To prevent this behaviour, the system, application and/or tuning parameters must be saved once as
persistent data on the Motion Terminal controller. This ensures that, when the higher-order controller
transfers the parameters, which are always the same, no change can be detected between the saved
and transferred values.
For special requirements, it may be the case that previously determined teach-in data need to be
retained after the system, application and/or tuning parameters were changed. For this purpose, the
option "Retention of existing teach-in data for parameter changes" can be set in the settings for the
Motion Terminal.
The setting is executed via the menu for the WebConfig or via the transfer mode in channel 14
(è Tab. 52 Meaning of the indices per addressed target and channel). With a parameter change, the
teach-in data are subsequently no longer reset automatically, but a message is entered once into the
malfunction list. When this option is activated, it is crucial that the user ensures that the actuated
parameter changes in combination with the existing teach-in data cannot lead to undesired behaviour
of the drive.
76 Festo — VTEM — 2019-03b