"Cam/Cam Track" Technology Object; General Information; Distance Output Cams (Position-Based Cams) - Siemens SIMATIC S7-1500 Manual

6 "Cam/Cam Track" Technology Object

6.1 General information

"Cam/Cam Track" Technology Object
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6.1 General information
The cam or cam track technology object is used for the highly precise output of
switching signals, depending on the position of an axis or an encoder.
For the output of switching signals it can be differentiated between the following
two cam types:


Distance output cams (position-based cams)


Time-based cams
Note Within a "cam" or "cam track" technology object, only one cam type each can be
used that has to be specified during the configuration of the technology object.
However, several technology objects can be interconnected on the same axis or
the same encoder.
6.1.1 Distance output cams (position-based cams)
For a distance output cam, the start and the end position of the cam is specified
absolute in relation to the interconnected axis. Here, it can be basically
differentiated between the setpoint and actual position of the axis.
Figure 6-1 Distance output cams
A distance output (position-based) cam can be switched on depending on the
direction, either only in forward direction, only in backward direction or in both
directions. If the axis position is located within the start and end position of the
defined cam and if the direction condition is met, the cam is switched on. Otherwise
the cam is switched off.
Figure 6-2 Direction-dependency of distance output (position-based) cams
+
80
TOs of S7-1500(T)
Entry ID: 109743134, V1.0,
Movement in positive direction
Path
90 100 110 120
Start position End position
Rising Falling
edge edge
05/2017
Movement in negative direction
-
80 90 100 110
Start position End position
Falling Rising
edge edge
Path
120
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