Operating instructions
Chapter
4
Flexi Classic
8011509/YPP0/2015-10-26
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
69
Subject to change without notice
Special applications and
functions
4.6.1
Muting with two sensors
In the example, the material moves from left to right on a conveyor belt
0
. As soon as the
muting sensors A1 and A2 are activated
1
, the protection provided by the ESPE protective
device is muted and the material can move into the hazardous area. As soon as the
muting sensors are clear again
2
, the protection provided by the protective device is re-
activated.
4.6.2
Muting cycle
The muting cycle is the defined sequence of all processes that take place during muting.
The cycle starts when the first muting sensor is activated. The cycle ends when the last
muting sensor returns to its initial state (e.g. clear light path for optical sensors). Only then
is it possible to activate muting again.
Material can be transported several times during a muting cycle, if the muting condition is
maintained continuously, i.e. at least one pair of sensors remains activated continuously.
4.6.3
Muting sensors
Muting sensors detect material and supply the necessary signals as required by an eva-
luation unit (e.g. the Flexi Classic modular safety controller.) If the muting conditions are
met, the evaluation unit can mute the protective device based on the sensor signals.
Sensor signals can be generated by the following external sensors:
•
optical sensors
•
inductive sensors
•
mechanical switches
•
controller signals
SICK muting sensors
An overview of the SICK muting sensors is available in the section 4.8 “SICK muting
sensors” on page 73.
Fig. 23: Schematic layout
0
1
2
A1
Hazardous area
A2
ESPE
Material
Means of transport
