Mitsubishi Electric SW1DNN-WS0ADR-B, Руководство по эксплуатации

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Chapter 9
225
Logic programming – Function blocks
Where …
L
1
= Minimum distance between the detection line of the ESPE and the detection
by A1, A2
L
2
= Distance between the two detection lines of the sensors (sensors
activated/sensors clear)
L
3
= Length of material in conveyor direction
v = Velocity of the material (e.g. of the conveyor belt)
t = Set total muting time [s]
T
IN Light curtain
, T
IN Muting sensor
= Response time of the light curtain or the muting sensors
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.
Note
Figure 210:
Valid muting sequence
using the basic configuration
setting (C1 input: without,
Override input: without,
Conveyor input: without)