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5-4 npn and pnp outputs, 5-5 series connection, 5-6 light interference prevention connection – KEYENCE SL-C Series User Manual

Page 22: English, Chapter 1 overview and specifications

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Chapter 1 Overview and Specifications

1-14

1

English

ENGLISH

1-5-4 NPN and PNP Outputs

The SL-C has two types of OSSD outputs: PNP output and NPN output. KEYENCE has a PNP output cable
and a NPN output cable for use as dedicated OSSD output cables, The OSSD output type can be switched
by selecting one of these cables.
These cables are identified by the color of the connector connected to the SL-C and by the tag attached to
the cable as follows.

Cable Type

Connector color

PNP output cable

Black

NPN output cable

Grey

1-5-5 Series Connection

2 or more sets of SL-C units can be connected by using a pair of dedicated series connection cables to form
a light curtain with a single set of output logic (see figure below).
In this instruction manual, the unit that is directly connected to the power supply unit and that supplies power
to the sensor units connected in series is called the “Unit 1,” and the next unit that is connected to the Unit 1
using a dedicated series connection cable are called “Unit 2.” Further, when used in serial connections the
device connected after “Unit 2” is “Unit 3”, and the next device is “Unit 4”.
For details regarding the connection method,

refer to “3-5 Series Connection” (

➮ page 3-4).

Unit 2

Unit 1

Tr

ansmitter

Receiv

er

Tr

ansmitter

Receiv

er

Synchronization cable

Output

(Orange)
(Orange/black)

1-5-6 Light Interference Prevention Connection

As shown in the figures below, using the light interference prevention function allows the parallel connection
of 2 or more sets of SL-C units and prevents light interference in the respective SL-C units. This connection
method is called a light interference prevention connection. (See the figure below.)
In this instruction manual, the unit that is connected parallel to the SL-C via a light interference prevention
cable and that transmits a signal for light interference prevention is called the “main unit”. The units that
receive the light interference prevention signal from the main unit and operate in accordance with this signal
are called “sub unit.”
When making a light interference prevention connection, one pair of SL-C Series units must be set as the
main unit, and the other as the sub unit.
For details regarding the connection method,

refer to “3-6 Connection for Light Interference Prevention” (

page 3-5). (PNP wiring shown below.)

Main unit

Sub unit

FSD1 FSD2

24V DC

Cable/gray

Cable/black

Shield

Shield

Light interference prevention

cable (input /-) (gray/black)

Light interference prevention

cable (output /+) (gray)

Light interference prevention

cable (input /+) (gray)

Light interference prevention

cable (output /-) (gray/black)

0 V (blue)

0 V (Blue)

Main/sub switching

input (pink)

Test input (purple)

OSSD2 (white)

OSSD1 (black)

+24 V (brown)

+24 V (brown)

RS-485(B)orange/black

RS-485(A) orange

Transmitter

Receiver

FSD1 FSD2

24V DC

Cable/gray

Cable/black

Shield

Shield

Light interference prevention

cable (output /+) (gray)

Light interference prevention

cable (input /+) (gray)

Light interference prevention

cable (output /-) (gray/black)

0 V (blue)

0 V (Blue)

Main/sub switching

input (pink)

Test input (purple)

OSSD2 (white)

OSSD1 (black)

+24 V (brown)

+24 V (brown)

RS-485(B)orange/black

RS-485(A) orange

Transmitter

Receiver

2-wire shielded cable

Light interference prevention

cable (input /-) (gray/black)