Chapter 9
224
Logic programming – Function blocks
9.10.9 Cross muting – material transport in both directions
Function block diagram
Representation of the application
The sensors can be located as follows in the case of muting applications with one
crossed sensor pair where the material has to be moved in both directions. The
optional signal C1 is not used in this application example.
Ensure that the muting sensors detect only the moved material!
Ensure that the muting sensors are positioned in such a manner that no one can enter
the hazardous area by fulfilling the muting conditions (meaning that they activate both
muting sensors and thus create the required conditions for muting).
Input conditions for muting sensors
Condition Description
A1 & A2 Muting applies as long as this condition is fulfilled and, furthermore,
the requirements mentioned above existed.
Equations and prerequisites for calculating the distance:
L
1
v × T
IN Muting sensor
v × t > L
2
+ L
3
T
IN Light curtain
< T
IN Muting sensor
Figure 208:
Function block diagram for
the Cross muting function
block
ATTENTION
Figure 209:
Cross muting for
bidirectional movement of
material
Table 105:
Conditions for Cross muting
without optional input C1
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