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Sensor can be connected directly to safe PLC
The IN 4000 safety system
switches on metal
Friction-free, immune to vibrations, easy to install and unaffected by dirt
– the new inductive IN 4000 safety system fulfils all the requirements
for the reliable monitoring of position or protective gates in harsh industrial
environments. A further highlight: the sensor of the IN 4000 can also
be connected directly to a safe PLC.
SICK insight 2/2004
>> The basic version of the IN 4000
consists of an inductive sensor in a cubic
housing for switching distances of
10 to 15 mm, and a relay evaluation
unit. The entire system, as well as
each of the two individual components,
is certified for Category 4 in compliance
with EN 954-1, making individual
safety solutions possible.
The IN 4000 inductive safety system Products 33
The direct solution
If the control system of the machine or
plant to be protected is based on a
safe PLC, the IN 4000 sensor can be
operated directly. This is possible because
the sensor’s input and output
signals are designed to correspond to
EN 61131-2 and are thus compatible
with the I/O signals of a safe PLC. Control
Category 4 according to EN 954-1
is maintained even if the maximum
number of 10 sensors is connected in
series.
The relay solution
If there is no safe PLC available, the
sensor can be connected to the
IN 4000 evaluation unit with relay outputs.
Here, too, connection of up to ten
sensors is possible – leading to considerable
cost savings, particularly in
the case of complex machines or
plants. Three safety-relevant N.O. contacts,
two N.C. contacts, and integrated
external device monitoring also
allow flexible integration in the particular
machine controller.
Monitoring the switching area
prevents tampering
The sensor’s inductive operating principle
means that no separately coded actuator
is required, i.e. the sensor
detects the presence or absence of
metal directly. In order to meet the requirement
to prevent simple tampering,
the switching area of the sensor is
monitored in terms of both time and
space. Unauthorised alterations are
detected and lead to the machine being
safely switched off.
The design of the IN 4000 inductive
safety system thus offers completely
new approaches to the safe monitoring
of position and protective gates on machines
and plants.
The basis version of the IN 4000: relay
evaluation unit and inductive sensor
insightLINK
You can obtain further product information
with the attached card under:
INFO 217
or on the Internet at:
www.sick.de/insight/en