Mitsubishi Electric WS0-CPU0 Operating Manual page 226

Chapter 9
Note
Figure 207:
Valid muting sequence
using the configuration basic
setting (C1 input: without,
Override input: without,
Conveyor input: without)
223
Logic programming – Function blocks
Where ...
L = Minimum distance between the detection line of the ESPE and the detection
1
by A1, A2
L = Distance between the two detection lines of the sensors (sensors
2
activated/sensors clear)
L = Length of material in conveyor direction
3
L = Maximum distance between C1 and the detection line of A1, A2
4
v = Velocity of the material (e.g. of the conveyor belt)
t = Set total muting time [s]
T , T
IN Light curtain IN Muting sensor
in the MELSEC-WS safety controller (See the Safety Controller User's Manual.)
 Material flow is only possible in one direction in this example.
 In order to move material in both directions (i.e. bidirectionally), place the
intersection directly in the light beams of the ESPE (See also Section 9.10.9).
 The sensor layout shown in this example is suitable for both through-beam
photoelectric switches and photoelectric reflex switches.
 Avoid mutual interference of the sensors.
 Increase the protection against manipulation and the safety level by using the
following configurable functions:
– concurrency monitoring
– monitoring of the total muting time
– muting end via ESPE
 Information on wiring can be found in Section 9.10.3.
Sequence/timing diagram
The function block requires that a valid muting sequence takes place. Figure 207
shows an example of a valid muting sequence based on the basic parameter setting
for this function block. The optional input C1 is not contained in the sequence shown
below.
= Response time of the light curtain or the muting sensors