Start Mode And Stop Mode - Siemens SIMOTION Function Manual

4.2.3.8

Start mode and stop mode

Start mode and stop mode are used to parameterize behavior on activation or deactivation of
a track.
Start mode
The start mode (startMode) is used to define when the cam track should become effective
after activation, or how tracks should be changed.
The mode is defined either as part of the cam track configuration in the Default window, or
directly as a default setting using the _enableCamTrack command.
Table 4-4 Types of start mode
Start mode
Effective immediately (default)
(IMMEDIATELY)
Immediately when cam track
output inactive
(IMMEDIATELY_BY_CAM_TRA
CK_OUTPUT_INACTIVE)
With next track cycle
(NEXT_CAM_TRACK_CYCLE)
Last programmed value
(EFFECTIVE)
Changing cam track output on the basis of the selected start mode
The effect of the start mode on cam track output is shown in the following table for two cam
tracks. The examples refer to activation of the same cam track with new or modified data.
Output Cams and Measuring Inputs
Function Manual, 04/2014
Description
Track becomes active immediately. If an output cam (or time-based cam) is defined or
active at the current position of the old track, the output is aborted. The new track is
enabled without delay (as quickly as possible). This enables high-speed exchange of
cam tracks.
If an output cam is already controlled and new data from the exchanged cam track
continues to control the track signal, the track signal is not interrupted.
Changeover is made to the new cam track if no single output cam is active (any longer)
on the old cam track. An active (output) single output cam on the old cam track is still
output completely.
If a changeover to the new track has not been made at the start position of a single output
cam on the new track, this output cam is not output. Only after the tracks have been
exchanged are the subsequent output cams on the new track output.
Track does not become active until the next track cycle, after either the axis reference
position (in the positive traversing direction) or the end position of the cam track (in the
negative traversing direction). The cam track end of the old track equals the axis reference
position of the new track. Immediately the first output cam on the new track switches, a
changeover is made to the new track. Up to that point, a time-based cam on the old track
is output.
The previous cycle is processed according to the previous command, the next cycle
according to the _enable command. This allows the next track to be enabled, although
another track is currently being processed.
It is necessary to use this mode if the enable must occur before the start of the new cam
track, for example, if the first output cam lies at the very start, but an output cam at the
very end of an old (inactive) track is not to be enabled by mistake.
The last programmed stop mode is active. If a stop mode is not programmed, the user
default setting is used.
Cam Track TO - Part II
4.2 TO Cam Track basics
83