Siemens SIMATIC S5 Equipment Manual page 22

R 02/92
Note 5:
It is possible to define a cam, the initial value of which is very close to the end values.
It is generally best to adjust the width of the cam to the traversing speed. It must still be possible to
read the respective track identifier during normal evaluation in the S5 cycle.
For quick reaction, use interrupts for these cams!
It must be observed, howeve~ that the reaction at the interrupt can first be pro–
cessed at the next breakpoint in the S5 program.
Depending on the operation mode of the individual programmable controllers, this
occurs after the command %F" or at block limits. For details, see the equipment
manual of the programmable controller used.
Note 6:
To influence the effect of the track identifier bit for a cam with an initial value equivalent to the end
value (A = E), these values must be transferred to the 1P 241 module sequentially.
Example 1:
First input the initial value, then the end value
reached.
Example 2:
First input the end value, then the initial value
reached.
This function cannot be effected with the standard function blocks.
After parameter assignment with FB 156 or modification of setpoints with
Usually when traversin with the system, such a cam is only recognized
at extreme creep spee s.
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General Function Description
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