More contacts for increased functionality
To comply with safety requirements, safety systems need
built-in redundancy. That’s why all of our safety switches
have extra contacts. Our D4N, D4NH, D4NS and D4NR models,
for example, have versions with 3 contacts; two normally
closed contacts for redundancy, and NO contacts to provide
a feedback contact to a PLC or HMI for monitoring the system
status. Identifying a problem quickly in the system reduces
downtime considerably and saves you money. In applications
like moulding and machine tooling, where interlock switches
are required, our 5-contact D4NL and D4GL switches are ideal.
When access to a critical process is required, the internal
solenoid-locking device gives the machine time to switch off
without damaging the process before enabling the door
to be safely opened.
Clever solutions that work for you - make-before-break
(MBB) contact
Once a door with a safety switch is opened the Normally
Closed (NC) contact in the safety switch opens and the
Normally Open (NO) contact closes. If there is an NO contact
connected to a PLC, any data inside is lost as soon as the
power switches off. That’s why Omron has incorporated
innovative make-before-break (MBB) contacts in the D4N,
D4NS, D4NH and D4NR switches. With an MBB contact the
normally open contact closes before the normally closed
contact opens. This provides enough time for the control
system (PLC) to save the process condition or similar vital
data. Now that’s clever!
Gold-clad contact for high reliability
A special gold-clad contact makes each switch suitable for
switching both standard loads and micro-loads. The switches
are tested to operate reliably at least one million times.
Plug and play connection with the M12
All two-contact single conduit switches (D4N,
D4NS, D4NH and D4NR) can be ordered with
a pre-assembled M12 connector. Installing this
four-pin connector is simply a matter of plug and
play, which reduces the need for especially skilled personnel
during periodic maintenance.
Standard key for safety-door interlocking
The key used in all key-operated switches
(D4NS, D4NL and D4GL) is four-times coded
to prevent any tampering. And one size fits
all models for easy replacement!
Environmentally friendly
In line with Omron’s environmental policy for all
electronic components, these safety switches
contain no lead, cadmium or hexavalent
chrome. What’s more, they already comply with
the EU directive on hazardous substances
(RoHS), which will be law in every European country by 2006.
Ready for the Chinese market
The People’s Republic of China has implemented a mandatory
certification on a wide range of products manufactured or sold
in China. Labelled the CCC mark, this certification combines
the former CCIB (safety) mark and the CCEE mark for electrical
components. All of these safety switches are CCC approved
for this market.
Maximum positioning flexibility
One switch fits all actuation directions.
The heads can be turned 4 times 90°
for maximum flexibility. The key
operated switches can be
actuated from the side and top
(giving 8 possible directions).
Operation pattern
Time gap the control system assumes
the switch is closed.
Safety dedicated
Feedback contact
for PLC
Standard contact
MBB contact
Feedback contact
for PLC
Safety dedicated
Overlapping time in that the control
system can recognize a shut down
by the safety device.
NO (feedback channel)
NC
NC
NO (feedback channel)
