8
Germany: +49 621 776-4411
Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
Pepperl+Fuchs Group
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USA: +1 330 486 0001
fa-info@us.pepperl-fuchs.com
Singapore: +65 6779 9091
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Copyright Pepperl+Fuchs
Issue date:16.08.2012
Sensor Connections/Sensor Outputs
Pepperl+Fuchs provides sensors that can be operated
with AC and/or DC supply voltages.
The following list provides an overview.
Two-wire DC sensors
These are operated in series with the load. Most are
voltage polarity independent (function independent
of connection polarity) and are predominantly short-
circuit proof, while others offer reverse polarity pro-
tection (function only with correct polarity, otherwise
the proximity switch remains at high impedance)
and are short-circuit proof.While in a locked state,
a low leakage current flows due to their functional
properties.While in switched state, a minor voltage
drop occurs at the switch.
Switching example:
BN
L+
L-
BU
The model number for sensors of this type includes
the reference -Z. Two-wire sensors are supplied as:
•
NO contact (Z/Z0, Z3, Z4),
•
NC contact (Z1, Z5),
•
Programmable wiring (Z2).
Three-wire DC sensors
These sensors have separate connections for the power
supply and the load. They are overload protected, short-
circuit proof, and reverse polarity protected. The leakage
current is negligible.
This group is divided into switched high (PNP) sensors
and switched low (NPN) sensors. Depending on the type
of sensor, the load is connected between output and 0 V
or between the output and +U B .
Last
L+
L-
NPN PNP
Due to the type of end stage transistor, switched low
end stages are often referred to as NPN end stages, and
switched high end stages are referred to as PNP end
stages.
Last
L+
L-
Switching example:
BN
L+
L-
BK
BU
The model number for the vast majority of this type of sen-
sor includes the reference -E.
Sensors of this type are supplied as:
•
NPN NO contact (E or E0),
•
NPN NC contact (E1),
•
PNP NO contact (E2),
•
PNP NC contact (E3),
•
NPN NO/NC contact convertible (E4)
•
PNP NO/NC contact convertible (E5).
•
PNP NO contact, dual channel (E8)
DC sensors, push-pull
These proximity switches are equivalent to the E-types,
although the output is fitted with both a PNP and an NPN
transistor. This enables the load to be switched between
the output cable and +UB or -UB. A push-pull output com-
bines the properties of a PNP and an NPN output.
Switching example:
Standard symbol/Connections:
(
version EP, pnp/npn)
Beam input
Synchronous
Switch output
Core colours in accordance with EN 60947-5-2.
+ U
B
1
-
U
B
2
4
3
5
(
BN)
(
WH)
(
GY)
(
BK)
(
BU)
U
Sensors with push-pull output are included in:
•
Photoelectric sensors
•
Ultrasonic sensors
•
Incremental rotary encoders.
Four-wire DC sensors
These proximity switches are equivalent to E-types, al-
though they are fitted with an NC contact output and an
NO contact output.
Switching example:
:
1
L+
L-
4
2
3
The model number for this type of sensor includes the ref-
erence -A. They are supplied as:
•
NPN NC/NO contacts (A or A0).
•
PNP NC/NO contacts (A2)
Sensors and Systems
Introduction
