R 02/92
General Function Description
n
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.
D
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
+
The track identifier bit is constantly 1, and then changes to O briefly when the
setpoint
is
reached.
Example 2:
First input the end value, then the initial value
+
The track identifier bit is constantly O, and then changes to 1 briefly when the
setpoint
is
reached.
This function cannot be effected with the standard function blocks.
After parameter assignment with
FB
156 or modification of setpoints with
FB
157 (AE), the status is always in accordance with example 1!
Usually when traversin with the system, such a cam is only recognized
c?
at extreme creep spee s.
1 – 13
1P
241 Equipment Manual
@
Siemens
AG 1989, Order No:
6ES5
998-0KD21
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