Mitsubishi Electric WS0-CPU0 - Parallel Muting

Chapter 9
218
Logic programming – Function blocks
9.10.6 Parallel muting
Function block diagram
Representation of the application
Figure 200 shows an example of the placement of sensors for Parallel muting.
In this example the material moves from the left to the right. As soon as the first
muting sensor pair A1 & A2 is activated, the protective effect of the protective device
(ESPE) is muted. The protective effect remains muted until the muting sensor pair B1
& B2 is 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 & B1 & B2
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.
Equations and prerequisites for calculating the distance:
L
1
 v × 2 × T
IN Muting sensor
v × t > L
1
+ L
3
L
1
< L
3
T
IN Light curtain
< T
IN Muting sensor
Figure 199:
Function block diagram for
the Parallel muting function
block
Figure 200:
Muting with two parallel
sensor pairs
Table 102:
Conditions for Parallel
muting