Siemens S7-300 - 3 Cam Control Basics; Properties of the Cam Types

FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
15
Cam control basics
3
3.1 Properties of the cam types
Cam types
You can assign each cam for operation as a position-based cam or time-based cam.
The table below shows a comparison of the properties of both cam types.
Table 3- 1 Definition and switching of the two cam types
Position-based cam Time-based cam
Representation
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Parameter
assignment
The following parameters are
assigned:
 Cam start
 Cam end
 Effective direction
 Lead time
The following parameters are
assigned:
 Cam start
 Activation time
 Effective direction
 Lead time
Effective direction Two effective directions are supported:
 positive: The cam is activated at
the cam start, if the axis is moving
in direction of increasing actual
values.
 negative: The cam is activated at
the cam end, if the axis is moving
in direction of decreasing actual
values.
You can set both effective directions in
parallel.
Two effective directions are supported:
 positive: The cam is activated at the
cam start, if the axis is moving in
direction of increasing actual
values.
 negative: The cam is activated at
the cam start if the axis is moving in
direction of decreasing actual
values.
You can set both effective directions in
parallel.