Specifications

AS-Interface
ASIsafe
SIMATIC FS400 light curtains
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Siemens IK PI · 2009
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■ Function (continued)
Reduced resolution
If an object is located in the light path, two or three beams can
be suppressed. The difference between reduced resolution and
floating blanking is that continuous monitoring does not take
place.
A DIP switch is used for configuration or the programming and
diagnostics software SafetyLab.
"Muting" function package
When arranged vertically, light curtains, light grids, and trans-
ceivers are often used for protecting access points. With addi-
tional sensor signals, the protective function can be suppressed
to allow material to be transported in or out of hazardous areas,
for example. The protective field is temporarily suppressed and,
once the goods have passed through, reactivated. Personnel
must not be allowed to enter the hazardous area while muting is
active.
Using the number of connected sensors or the sequence of
the muting signals, the devices automatically recognize the
"sequential muting" mode when inputs M1 to M4 are assigned
and "2-sensor parallel muting" when the signals M2 and M3 are
assigned. A DIP switch can be used to set "4-sensor parallel
muting".
Muting restart
If the power fails while goods are passing the muting sensors, for
example, the valid muting sequence is interrupted. When the
power supply has been restored, muting is not automatically
resumed because the muting sequence is not as expected.
To remove the goods from the area covered by the muting
sensors, an integrated retraction mode can be activated using
the start key. The light curtain attempts to find a valid muting
sequence from the muting sensors. If successful, the muting
indicator lamp stops flashing and is lit continuously. If unsuc-
cessful, the start key must be kept depressed until the muting
path is completely free.
4-sensor sequential muting
If the material that is to be transported in the danger zone always
has the same dimensions and there is no lack of space, the use
of sequential muting is preferred. With sequential muting, four
muting sensors are connected. These must be activated in a
predefined sequence to trigger muting. They can be activated in
either of the following sequences: M1, M2, M3, M4 or M4, M3,
M2, M1. The transported goods must be of sufficient length to
briefly activate all 4 sensors simultaneously. Sequential muting is
successfully completed when the third muting sensor to be acti-
vated is not activated any longer.
The SafetyLab software can be used to select a muting variant
in which the second muting sequence is triggered before the
first has finished (sequential muting with two objects). This
variant saves time and, in turn, production costs for the user.
2-sensor parallel muting
Parallel muting is ideal in plants in which the dimensions of the
goods are not constant or space requirements must be kept to a
minimum. Two muting sensors can be used, whose beams inter-
sect behind the protective field in the danger zone.
Parallel muting is used when signals M2 and M3 are switched
simultaneously without M1 and M4 having been activated or
connected beforehand or simultaneously. Two-sensor parallel
muting is straightforward because only two muting sensors are
required. Goods can also be moved forward and backward
within the muting area.
NSC0_00634a
Area with reduced resolution
Start
M1 M2 M3 M4
Danger Zone
EEEE
SSSS
E
S
Start
M2
M3
Danger Zone
E
S