Rockwell Automation 871L User Manual

INSTALLATION INSTRUCTIONS

Programmable

BULLETIN 871L AC/DC LIMIT SWITCH STYLE INDUCTIVE PROXIMITY SENSOR

Head Size

40

Nominal Sensing

Distance

mm (inches)

20 (0.79) Y

40 (1.57) N

Shielded

Output

Configuration

Programmable
N.O. or N.C.

Switching

Frequency

(Hz)

15

Part Number

Conduit Opening Mini Style QD Micro Style QD

871L-B20E40-T2 871L-B20E40-N3 871L-B20E40-R3

871L-B40E40-T2 871L-B40E40-N3 871L-B40E40-R3

Specifications

Load Current 400mA

Minimum Load Current 2mA

Leakage Current

Operating Voltage 20Ć250V AC/DC

Voltage Drop

Repeatability

Hysteresis

False Pulse Protection Incorporated

Transient Noise Protection Incorporated

Short Circuit Protection Incorporated

Overload Protection Incorporated

Enclosure NEMA 3, 4, 6, 12 and 13

Connections Conduit Opening: 1/2Ć14 NPT internal

2 LEDs Green: Power (Blinks in SCP/Overload)

Operating Temperature

Shock and Vibration 30G, 10Ć55Hz

≤2mA

≤5V
≤5%
≤20%

IP67 (IEC 529) Polyloy

Quick Disconnect: 3Ćpin mini style

Orange: Output Energized

-25°C to +70°C (-13°F to +158°F)

thread with screw
terminals

3Ćpin micro style

Accessories

Optional Mating Cables

Part Number

871A-CS3-R2 2M (6.56 ft.) 3Ćpin, microĆstyle straight

871A-CS3-R4 4M (13.1 ft.) 3Ćpin, microĆstyle straight

871A-CS3-R5 5M (16.4 ft.) 3Ćpin, microĆstyle straight

871A-CS3-N1 1M (3.28 ft.) 3Ćpin, miniĆstyle straight

871A-CS3-N2 2M (6.56 ft.) 3Ćpin, miniĆstyle straight

871A-CS3-N4 4M (13.1 ft.) 3Ćpin, miniĆstyle straight

871A-CRL3-N1 1M (3.28 ft.) 3Ćpin, miniĆstyle right angle LED

871A-CRL3-N2 2M (6.56 ft.) 3Ćpin, miniĆstyle right angle LED

871A-CRL3-N4 4M (13.1 ft.) 3Ćpin, miniĆstyle right angle LED

Length Description

Wiring Diagrams

Conduit Opening

Normally Open

T1

Normally Closed

T2

Load

Correction Factors

Target Material

Steel 1.0

Stainless Steel 0.90

Brass 0.50

Aluminum 0.45

Copper 0.40

Correction Factor

Description

Bulletin 871L inductive proximity sensors are self-contained,
general purpose, solid state devices. These devices are
designed for most industrial applications where it is required to
sense the presence of metal objects (ferrous and non-ferrous)
without touching them.

The 871L limit switch style provides mounting
interchangeability, easy to wire terminations, rugged
construction, and superior sealing. The 25 (twenty-five)
position sensing head allows for twenty-four side views and
one top view.

Diagnostics

Green on indicates power on.
Orange on indicates output is energized.
Green flashing indicates short circuit or overload.

Micro QD

Mini QD

T1

Note: Load can be switched to terminal 1.

Normally Open or Normally Closed

3

1

Note: Load can be switched to pin 2.

Normally Open or Normally Closed

1

Note: Load can be switched to pin 3.

T2

Load

Load

2

32

Ground

Ground

Load

Installation

Alignment

When power is applied to the sensor, the green (power on)
indicator will turn on. Visually sight the sensing head at the
object to be detected until the orange (output energized)
indicator turns on when the sensor is set for normally open or
turns off when the control is set for normally closed.

Sensor (Top View)

Target

Orange Green

Output Energized Power On

Rotation of Sensing Head

Insert screwdriver in slot located at the bottom of the clear
plastic cover, gently pull upward. This will release the locking
mechanism and enable rotation of the sensing head. The
sensing head can be rotated in 15° increments.

Locking

Mechanism

Selecting Output

Insert screwdriver in slot located at the bottom of the clear
plastic cover, gently pull upward. This will release the locking
clip and allow access to the selectable output. The switch is
supplied in the normally open position. Simply move the
switch to the normally closed position; re-wiring is not
necessary.

(N.C.)

(N.O.)

Locking

Mechanism

Wiring of Terminal Base

Unlock the plastic cover to access the black bar. To release
the base, simply lift the black bar located inside the body . This
will release the locking mechanism. Gently pull the terminal
base from the sensor body to access the screw terminals.

Note: All external wiring should conform to the National Electric

Code and applicable local codes. See wiring diagrams
for external connections.

Sensing Head Position

Unlock plastic cover and rotate sensing head so that clips are
in the top position. To change from side sensing to top
sensing, simply snap back the two clips located on either side
of the sensing head. Release and rotate the head to the top or
side position, return clips to locking position to secure head.

Clips Must be in

Top Posititon

Dimensions — mm (inches)

Conduit Style

40.0

60.0

(2.36)

(1.57)

40.0

(1.57)

7/8Ć16UNĆ2A

Conduit

Entrance

1/2-14 NPT

30.0

(1.18)

15.9

(0.63)

120.0

(4.72)

LEDs

7.3

(0.29)

Mini Style

Quick-Disconnect

17.0

(0.67)

30.0

(1.18)

M12 x 1

Black Bar

Micro Style

Quick-Disconnect

30.0

(1.18)

Publication 46803–054–01(A)

November 1994

Printed in USA