Configuring Cam Tracks On Simotion C240 - Siemens SIMOTION Function Manual

Cam Track TO - Part II
4.3 Configuring the TO Cam Track
4.3.10

Configuring cam tracks on SIMOTION C240

1. Insert a new output cam or a new cam track or use an existing one.
2. Parameterize the TO Output Cam / Cam Track
3. Double-click Configuration below the output cam or the cam track in the project navigator.
4. For high-speed, hardware-supported output cams, you can achieve an output accuracy
5. Assignment of an output to an output cam/cam track is supported as of V4.2 either by
6. Click OK to close the window and select Project > Save from the menu.
4.3.11 Determining derivative-action times for cam tracks (dead time compensation)
Depending on the system and the device, there is a certain time between the setting of a cam
output by the program and the actual reaction of the actuator (e.g. solenoid valve). This time
is called dead time and depends, for example, on the load-dependent delay times of a digital
output, the switching properties of a valve, etc. Usually the exact value for the dead time is not
known and can therefore be determined empirically through measurements.
In order that an output cam switches at the correct time, the dead time must be compensated
by specifying a derivative-action time, which offsets the cam output by the dead time. Whereby
it must be taken into account that the derivative-action times for switching an actuator on and
off are usually different.
The empirical determination of the dead times using a difference measurement as an example.
Note
The procedure applies not only to output cams, but also to cam tracks. However, with cam
tracks you can only specify a derivative-action time for the entire cam track.
Example
Lines of glue are to be applied to a product at a defined position and with a fixed length. The
glue output is controlled by an output cam or a cam track. The glue is output from the start of
output cam (switch-on point) to the end of output cam (switch-off point). The offset of the begin
and end of output cam with respect to the velocity can be observed on the length and position
of the glue line on the product (see figure). The figure below shows the line of glue for two
velocities (v
116
The Configuration window appears in the working area.
exceeding the servo cycle clock based on the hardware used. Should you wish to configure
a high-speed output cam, select the Activate output check box and select the High-speed
digital output (DO) radio button
symbolic assignment (see Chapter Symbolic Assignment (as of V4.2) in the SIMOTION
Runtime Basic Functions manual) or by entering the hardware address. During a
consistency check in SIMOTION SCOUT, no check is made as to whether the entered HW
address actually belongs to a high-speed digital output (DO).
, v ) with v > v
1 2 2
.
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Output Cams and Measuring Inputs
Function Manual, 04/2014