Chapter 9
220
Logic programming – Function blocks
9.10.7 Sequential muting
Function block diagram
Representation of the application
Figure 203 shows an example of the placement of sensors using the Sequential
muting function block.
In the example, the material moves from the left to the right. As soon as the muting
sensors A1 & A2 are activated, the protective effect of the protective device (ESPE) is
muted. The protective effect remains muted until a sensor of the muting sensor pair
B1 & B2 becomes clear again.
Input conditions for muting sensors
Condition Description
A1 & A2
(or B1 & B2)
Starts the muting cycle. The first sensor pair is activated depending
on the direction of transportation of the material.
A1 & A2 & B2 & B1 Condition for transferring the muting function to the second sensor
pair.
B1 & B2
(or A1 & A2)
Muting applies as long as this condition is fulfilled. The second
sensor pair is activated depending on the direction of transportation
of the material.
Figure 202:
Function block diagram for
the Sequential muting
function block
Figure 203:
Example of the sequential
layout of muting sensors
Table 103:
Conditions for Sequential
muting with four sensors
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