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.

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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.

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Specification No. 02125-001 Rev 0713

CONNECTION INSTRUCTIONS #3

Z

Encoder Circuit
Common

ENCODER

B

A

CONTROLLER

A/ A B/

B

Z/

Z

Vs, 5V to 28V

0V, Power Common

+5 Output

A or A/

A

A/

B or B/

B

B/

Z or Z/

Z

Z/

+V

0V

A

A/

B

B/

Z/

Z

+V

0V

REG

VS

0V

Optical Isolator

Encoder Open Collector Output

Figure 3
Connection Diagram
Open Collector to Optical Module

Optical Regulation

Power Supply

AUX

5V

Uses for Optical Isolator Module

Optical
Isolator
Module

TTL

Single-Ended

Receiver

> 20’

< 6’

FIGURE 4
LONG CABLE RUN TO SINGLE ENDED INPUT

To 5 AUX for 5V module.
To 12-15 for 24V dependent
on specified module input
voltage.

Open Collector with or without Internal Pull-up Resistors

Encoder NPN (sinking) outputs.
Connect encoder output A to optical isolator module input A/, B to B/ and Z to Z/. Connect the A, B, and Z

inputs of the optical isolator to the auxiliary output terminal on the optical isolator module for 5V module and to
higher voltage when specified by module model and part number. This connection results in a logic inversion
within the optical isolator module. To compensate for the logic reversal, swap A for A/, B for B/, and Z for Z/
at the optical isolator outputs.

Example 1: Resolve an electrical conflict between encoder output and receiving electronics

Sometimes system constraints result in an incompatibility between the encoder output and the receiving electronics or the
cabling. A typical symptom of this problem is missed or intermittent counts. As an example, a single-ended TTL receiver
that is more than 20 feet from the encoder may not be able to compensate for the signal attenuation and ringing caused
by the encoder cabling. An optical isolator module installed near the receiver as shown in Figure 4 can receive the signal,
rejecting the cable effects and produce a signal compatible with the input device.

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Specification No. 02125-001 Rev 0713

Opto

Isolator

60001

-

003

FIGURE

5

CONNECTION DIAGRAM FOR

MULTIPLE,

NON

-

COMPATIBLE RECEIVERS

Opto

Isolator

60001

-

003

Opto

Isolator

60001

-

003

Opto

Isolator

60001

-

002

Encoder

Supply V

5V Logic

Line Driver

5V Output

Maximum of 8 Optical Isolator Modules

24V Supply

24V Logic

12

V Supply

12

V Logic

5

V Supply

5

V Logic

24V Supply

5

V Logic

Optical Isolator

Module

PLC

500’

500’

FIGURE 6
REPEATER FOR VERY LONG CABLE RUNS

Example 2: Signal Splitter

The optical isolator can be used to connect a single encoder to multiple devices. Optical isolator can be used
to split an encoder output to drive up the 8 devices as shown in Figure 5. One optical isolator module is used
to drive each receiver. Optical isolator modules can be specified with outputs to match receiver inputs; i.e. an
encoder signal can be split to drive a differential TTL input with one module, a 12 V line driver with another
module and provide an open collector, NPN signal with another module.

* Also see the BEI Encoder Signal Broadcaster Module on page 5 for this application*

Example 3: Repeater

On extremely long cable runs (greater than 500 feet), an optical isolator module may be needed as a mid­point repeater to receive, amplify and re-broadcast the signal. An example is illustrated in Figure 6.

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Specification No. 02125-001 Rev 0713

(1)

Encoder Output

Logic Level

Voltage

(2)

Optical Isolator

Output Logic Level

Voltage

(3)

Model Number

(4)

Part Number

5V

Vout = Vin

Vout = 5V

Vout = OC

EM-DR1-IC-5-TB-28V/V
EM-DR1-IC-5-TB-28V/5

EM-DR1-IC-5-TB-28V/OC

60001-003
60001-002
60001-004

12-15V

Vout = Vin
Vout = 5V
Vout = OC

EM-DR1-IC-15-TB-28V/V
EM-DR1-IC-15-TB-28V/5

EM-DR1-IC-15-TB-28V/OC

60001-008
60001-012
60001-014

24V

Vout = Vin
Vout = 5V
Vout = OC

EM-DR1-IC-24-TB-28V/V
EM-DR1-IC-24-TB-28V/5

EM-DR1-IC-24-TB-28V/OC

60001-010
60001-011
60001-013

Optical Isolator Selection Table

Additional Modules and Accessories

ENCODER SIGNAL BROADCASTER MODULE

Accepts standard incremental encoder inputs and can broadcast up to four
encoder signals to four independent devices. Each of the broadcast signals
are optically isolated eliminating ground loops.

POWER SUPPLY

With a wide range of acceptable input voltages (AC and DC) this DIN Rail
mountable power supply is usable in virtually all industrial applications
worldwide. It has built in surge protection to reduce faults due to transients and
it has 100% reserve capacity for startup and overload conditions.

CABLE AND CABLE ASSEMBLIES

Cable reels for your own custom wiring requirements or cable assemblies are
available, using high quality custom BEI standard cable consisting of four, low
capacitance shielded twisted pairs with an overall shield, extra large
conductors for power, and signal ground; all within an abrasion-resistant PVC
jacket.

Cable Reels

100 ft. reel Part No. 37048-003-100
500 ft. reel Part No. 37048-003-500

Cable Assemblies
Part Nos. for MS3106F14S-6S Mating Connector

10 ft. # 31186-1410 │ 20 ft. # 31186-1420 │30ft. # 31186-1430

Part Nos. for MS3106F16S-1S Mating Connector

10 ft. # 31186-1610 │ 20 ft. # 31186-1620 │30ft. # 31186-1630

Part Nos. for MS3106F18S-1S Mating Connector

10 ft. # 31186-1810 │ 20 ft. # 31186-1820 │30ft. # 31186-1830

To find the correct optical isolator for your application, look in column 1 for the logic voltage of your encoder.
Then choose the correct row in column 2 that describes the type of output from the isolator that is compatible
with your receiving electronics. Read across to columns 3 and 4 to find the module and part number of the
correct optical isolator.

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

93117-2807| www.beisensors.com

Specification No. 02125-001 Rev 0713