OPTICAL ISOLATOR
ELECTRONIC MODULE
ELECTRICAL SPECIFICATIONS
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.
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.
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.
Output Code Format
From Encoder
22.5 mm
(0.89 inches)
114.5 mm
(4.51 inches)
99 mm
Dual Channel in quadrature plus index and complements. Data lines are designated A, B, Z, A/, B/, Z/ at the
module
Differential line driver (Use Connection Instructions #1)
Output Signal Type
From Encoder
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
Frequency Response
of Optical Isolator
Power Requirements
For Optical Isolator
Optical Isolator
Output Options
Protection Level
Tristate Outputs
5 VDC (TTL, RS422 compatible, line driver)
12-15 VDC
24VDC
1 MHz, maximum
5-28 VDC ±5%, 75mA plus load current
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
Supply lines protected against over voltage to 60 volts and reverse voltage
Available as –S Special Feature
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Specification No. 02125-001 Rev 0713
CONNECTION INSTRUCTIONS #1
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).
Figure 1
Standard Connection to
Optical Isolator Module
A
Z
Z/
No Connection
No Connection
Optical Isolator
A
A/
A
A/
B
B/
Z
Z/
REG
Z
Z/
VS
0V
B
B/
A
A/
A/
ENCODER
B
B/
B/
B
CONTROLLER
Z
A/
Z/
Vs, 5V to 28V
0V, Power Common
B
B/
Z
Z/
A
+V
0V
Encoder Differential Line Driver Output
+V
0V
CONNECTION INSTRUCTIONS #2
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.
Figure 2
Connection Diagram
Single Ended Line Driver
A
No Connection
Z
No Connection
Optical Isolator
A
A
A/
A
A/
Connect A/, B/, Z/ to
Encoder Circuit
Common
A/
B
B
B
B/
B
B/
Z
Z/
REG
VS
0V
ENCODER
B/
B
CONTROLLER
Z
Z/
A
Vs, 5V to 28V
0V, Power Common
Z
Z
Z/
+V
0V
Encoder Single Ended Line Driver Output
+V
0V
Encoder
Supply
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Specification No. 02125-001 Rev 0713
CONNECTION INSTRUCTIONS #3
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.
Z
+5 Output
A/
Encoder Circuit
Common
Figure 3
Connection Diagram
Open Collector to Optical Module
Optical Isolator
A
A
B/
A or A/
ENCODER
B
B
CONTROLLER
Z/
A/
B
A
A/
B or B/
B/
Z
B
B/
Z
Z/
5V
REG
VS
0V
A
Z
Vs, 5V to 28V
Z or Z/
Z/
AUX
0V, Power Common
To 5 AUX for 5V module.
To 12-15 for 24V dependent
on specified module input
voltage.
+V
+V
Optical Regulation
Power Supply
0V
Encoder Open Collector Output
0V
Uses for Optical Isolator Module
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.
Optical
Isolator
Module
TTL
Single-Ended
Receiver
> 20’
FIGURE 4
LONG CABLE RUN TO SINGLE ENDED INPUT
< 6’
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Specification No. 02125-001 Rev 0713
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*
FIGURE 5
CONNECTION DIAGRAM FOR
MULTIPLE,
NON-COMPATIBLE RECEIVERS
Opto Isolator
60001-003
Encoder
Supply V
5V Logic
Line Driver
5V Output
Opto Isolator
60001-003
Opto Isolator
60001-002
24V Supply
24V Logic
12V Supply
Opto Isolator
60001-003
12V Logic
5V Supply
5V Logic
24V Supply
5V Logic
Maximum of 8 Optical Isolator Modules
Example 3: Repeater
On extremely long cable runs (greater than 500 feet), an optical isolator module may be needed as a mid-
point repeater to receive, amplify and re-broadcast the signal. An example is illustrated in Figure 6.
FIGURE 6
REPEATER FOR VERY LONG CABLE RUNS
Optical Isolator
Module
PLC
500’
500’
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Specification No. 02125-001 Rev 0713
Optical Isolator Selection Table
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.
(1)
(2)
Encoder Output
Optical Isolator
(3)
(4)
Logic Level
Output Logic Level
Model Number
Part Number
Voltage
Voltage
Vout = Vin
EM-DR1-IC-5-TB-28V/V
60001-003
5V
Vout = 5V
EM-DR1-IC-5-TB-28V/5
60001-002
Vout = OC
EM-DR1-IC-5-TB-28V/OC
60001-004
Vout = Vin
EM-DR1-IC-15-TB-28V/V
60001-008
12-15V
Vout = 5V
EM-DR1-IC-15-TB-28V/5
60001-012
Vout = OC
EM-DR1-IC-15-TB-28V/OC
60001-014
Vout = Vin
EM-DR1-IC-24-TB-28V/V
60001-010
24V
Vout = 5V
EM-DR1-IC-24-TB-28V/5
60001-011
Vout = OC
EM-DR1-IC-24-TB-28V/OC
60001-013
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
Tel: 805-968-0782/800-350-2727 | Fax: 805-968-3154/ 800-960-2726 | 7230 Hollister Ave, Goleta, CA
93117-2807|
www.beisensors.com
Specification No. 02125-001 Rev 0713
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