BEI Sensors Optical Isolator Interface Module User Manual

OPTICAL ISOLATOR

ELECTRONIC MODULE

Output Code Format
From Encoder

Dual Channel in quadrature plus index and complements. Data lines are designated A, B, Z, A/, B/, Z/ at the
module

Output Signal Type
From Encoder

Differential line driver (Use Connection Instructions #1)
Single ended line driver (Use Connection Instructions #2)
Single ended open collector with pull-up resistors internal to encoder (Use Connection Instructions #3)
Single ended, open collector (Use Connection Instructions #3)

Output Signal
Voltage Level From
Encoder

5 VDC (TTL, RS422 compatible, line driver)
12-15 VDC
24VDC

Frequency Response
of Optical Isolator

1 MHz, maximum

Power Requirements
For Optical Isolator

5-28 VDC ±5%, 75mA plus load current

Optical Isolator
Output Options

28V/V Line Driver, 100mA source/sink, Vout = Vin
28V/5 Line Driver, 100mA source/sink, Vout = 5V (Derate output current to 50mA with supply voltage > 12VDC)
28V/OC NPN Open Collector, 80mA sink

Protection Level

Supply lines protected against over voltage to 60 volts and reverse voltage

Tristate Outputs

Available as –S Special Feature

ELECTRICAL SPECIFICATIONS

MECHANICAL SPECIFICATIONS

Package dimensions are 114.4 mm high by 99 mm wide by 22.5
mm thick. The package mounts to a DIN rail type EN 50 022
(35mm X 7.5mm). A length of DIN rail is supplied with each
module. The module simply snaps directly to the DIN rail and is
ready to use.

22.5 mm
(0.89 inches)

114.5 mm
(4.51 inches)

99 mm

POWER:

The optical isolator can accommodate standard operating
voltages from 5 to 28 VDC. It should never be connected
directly to AC power mains. The module draws approximately
75 mA and a green LED indicates the unit is powered. The
optical isolator module does not provide power to the encoder.
Any encoders used in conjunction with this module must be
connected to their own power.

SIGNAL:

Specifying an optical isolator module requires knowledge of
three system parameters: the DC supply voltage available in the
system; the encoder output type (logic levels and driver type);
and the input signal specifications of the receiving electronics.

This is a versatile interface between an incremental
encoder and receiving electronics. It accepts single
ended or differential inputs and provides single ended or
differential outputs in either an open collector or line
driver configuration. It accommodates all standard
operating voltages from 5 to 28 VDC. Up to eight Optical
Isolator Modules can be daisy-chained to provide

multiple, simultaneous outputs to controllers or PLC’s.

This Optical Isolator can help clean up noisy signals by
converting to a different line driver output. It has a 1
MHz throughput capability and can be used wherever a
fast, optically isolated interface is required.

Tel: [phone] | Fax: [phone] | 7230 Hollister Ave, Goleta, CA

93117-2807| www.beisensors.com

Specification No. 02125-001 Rev 0713

CONNECTION INSTRUCTIONS #1

Z

Z/

No Connection

No Connection

ENCODER

B/

B

A/

A

CONTROLLER

A

A/

B

B/

Z

Z/

Vs, 5V to 28V

0V, Power Common

A

A

A/

A/

B B B/

B/

Z

Z

Z/

Z/

+V

0V

A

A/

B

B/

Z/

Z

+V

0V

REG

VS

0V

Optical Isolator

Encoder Differential Line Driver Output

Figure 1
Standard Connection to
Optical Isolator Module

CONNECTION INSTRUCTIONS #2

A

A

A/

B B B/

Z

Z

Z/

+V

0V

A

A/

B

B/

Z/

Z

+V

0V

REG

VS

0V

Optical Isolator

Encoder Single Ended Line Driver Output

Figure 2
Connection Diagram
Single Ended Line Driver

Encoder
Supply

Z

No Connection

Connect A/, B/, Z/ to
Encoder Circuit
Common

ENCODER

B

A

CONTROLLER

A

A/

B

B/

Z

Z/

Vs, 5V to 28V

0V, Power Common

No Connection

Differential Line Driver

Encoder signals from 5 VDC to 24 VDC (must specify the voltage when ordering)
This is the preferred type of encoder output as it has the best noise immunity. Connect each encoder signal to its like optical isolator

input (A to A, A/ to A/, etc).

Single Ended Line Driver

Encoder signal from 5 VDC to 24 VDC (must specify the voltage when ordering)
Connect encoder output A to optical isolator module input channel A, B to B and Z to Z. Connect the A/, B/, and Z/ inputs of the optical

isolator to circuit common of the encoder supply. Single ended operation is limited to shorter cable runs and is more susceptible to noise.

Tel: [phone] | Fax: [phone] | 7230 Hollister Ave, Goleta, CA

93117-2807| www.beisensors.com

Specification No. 02125-001 Rev 0713