Chapter 9
Note
Figure 210:
Valid muting sequence
using the basic configuration
setting (C1 input: without,
Override input: without,
Conveyor input: without)
225
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
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 possible in both directions in this example.
In order for material to be moved in both directions, place the intersection of the
muting sensors exactly in the course of the light beams of the ESPE.
In order to move material in one direction only, place the intersection, with regard to
the direction of the transport, behind the light beams of the ESPE (see Section
9.10.8).
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 210
shows an example of a valid muting sequence based on the basic parameter setting
for this function block.
= Response time of the light curtain or the muting sensors