ICP DAS USA CAN Repeater I-7531 User manual
User Manual
Version 1.6.0 February 2018
I-7531(-UT)
(CAN Bus Isolated Repeater)
Written by Ives Shen
Edited by Kalia Huang
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：2
Table of Contents
1. Introduction .........................................................................................................................4
1.1 Features..........................................................................................................................5
1.2 Specification....................................................................................................................5
1.3 Application ......................................................................................................................5
2. Technical data......................................................................................................................6
2.1 Block Diagram.................................................................................................................6
2.2 Appearance.....................................................................................................................7
2.3 Pin Assignment ...............................................................................................................8
2.4 Wire Connection ...........................................................................................................10
2.5 Status LED....................................................................................................................11
2.6 Terminator Resistor Setting...........................................................................................11
2.7 Cable Selection.............................................................................................................13
2.8 Driving Capability and Baud Rate .................................................................................13
3. Application Architecture...................................................................................................15
4. Dimension and Mounting .................................................................................................16
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：3
Important Information
Warranty
All products manufactured by ICP DAS are under warranty regarding
defective materials for a period of one year, beginning from the date of
delivery to the original purchaser.
Warning
ICP DAS assumes no liability for any damage resulting from the use of this
product.ICP DAS reserves the right to change this manual at any time
without notice. The information furnished by ICP DAS is believed to be
accurate and reliable. However, no responsibility is assumed by ICP DAS
for its use, not for any infringements of patents or other rights of third parties
resulting from its use.
Copyright
Copyright @ 2016 by ICP DAS Co., Ltd. All rights are reserved.
Trademark
Names are used for identification purpose only and may be registered
trademarks of their respective companies.
Contact us
If you encounter any problems while operating this device, feel free to contact us
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：4
1. Introduction
I-7531 / I-7531-UT is a CAN repeater used to establish a physical coupling of two or more
segments of a CAN bus system. User can implement tree or star topologies as well as for long
drop lines with I-7531 / I-7531-UT. Connecting via I-7531 / I-7531-UT, the division of a CAN
system into several subsystems increases the maximum number of bus nodes.
Figure1. Application of I-7531 / I-7531-UT
I-7531 / I-7531-UT is an optically isolated CAN repeater which provides 2500 Vrms optical
isolation allowing you to separate and protect critical segments of the system from the rest of the
CAN network. And its galvanic isolation isolates both CAN segments from each other as well as
from the power supply. The CAN connection of I-7531 is by terminal blocks. Apower supply of 10
~ 30 VDC is required. I-7531 / I-7531-UT is housed in a rugged DIN-Rail mountable box, making it
easy to install in an industrial cabinet. Therefore, I-7531 / I-7531-UT can be used in CANopen,
DeviceNet and generic ISO 11898-2 standard.
If user wants to know more detail information about the I-7531 / I-7531-UT, please visit our
website as follow:
http://www.icpdas.com/products/Remote_IO/can_bus/i-7531.htm
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：5
1.1 Features
High speed
Removable terminal block & Mountable on DIN Rail
Bus pins protected against transients in an industrial environment
No disturbance of the bus lines with an un-powered node
Transmit data (TxD) dominant time-out function prevents the output drivers from driving
a permanent dominant state
A thermal protection circuit is integrated to prevent the transceiver from damage if the
junction temperature exceeds thermal shutdown level
1.2 Specification
Support CAN 2.0A/CAN 2.0B
Fully compatible with ISO 11898-2
Maximum communication baud : 800Kbps
Propagation Delay: ~200ns
Driving capability: Up to 100 nodes on each CAN port
Photo-coupler isolation between 2 CAN ports: 2500 Vrms
Power consumption: 2W max
CAN terminal resistors are integrated (can be disabled by jumper)
3KV galvanic isolated among of power supply and each CAN port
Power Supply: +10VDC ~ +30VDC
I-7531’s Operating temperature: -25°C ~ +75°C
I-7531-UT’s Operating temperature: -40°C ~ +85°C
Humidity: 5% ~ 95%
Dimensions: 122 mm x 72 mm x 35 mm
1.3 Application
Home Automation
Vehicle Automation
Monitor system
Factory Automation
Building Automation
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：6
2. Technical data
2.1 Block Diagram
Figure 2 is a block diagram illustrating the functions of the I-7531 module. Power supply are with
3000 VDC galvanic isolated between each CAN port. Futhermore, there is photo-isolation 2500
Vrms between two CAN ports.
Figure2. Block Diagram of I-7531
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：7
2.2 Appearance
Figure3. Appearance of I-7531 / I-7531-UT
Power Input
CAN Port 1
CAN Port 2
Status LED of Power &
Communication
i-7531
CAN bus Repeater
‧Support CAN 2.0A/2.0B
‧Photo-isolation: 2500 Vrms
‧Expand the number of CAN buses
‧Mountable on DIN Rail
3000VIsolation
GND
11
(CAN)
20 CAN_L
CAN_H
FG
GND
10
(CAN)
1
CAN_L
CAN_H
FG
(R)VS+
(B)GND
Frame Ground
Frame Ground
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：8
2.3 Pin Assignment
Figure4. Pin Assignment of I-7531 / I-7531-UT
Table1. Pin Description of I-7531 / I-7531-UT
No.
Part
Name
Description
1
CAN
Port 1
CAN_L
CAN_Low. Signal Line of CAN port 1.
3
CAN_H
CAN_High. Signal Line of CAN port 1.
5
GND
CAN_Ground (or CAN_GND), Voltage level of
ground of CAN_L and CAN_H of CAN port 1.
7
FG
FG
Frame Groud.
9
Power
Input
(R)VS+
Voltage Source. It could be +10VDC ~ +30VDC.
10
(B)GND
Power Ground.
14
FG
FG
Frame Groud.
16
CAN
Port 2
GND
CAN_Ground (or CAN_GND), Voltage level of
ground of CAN_L and CAN_H of CAN port 2.
18
CAN_H
CAN_High. Signal Line of CAN port 2.
20
CAN_L
CAN_Low. Signal Line of CAN port 2.
GND
11
(CAN)
20 CAN_L
CAN_H
FG
GND
10
(CAN)
1
CAN_L
CAN_H
FG
(R)VS+
(B)GND
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：9
Note 1:
In some cases, the voltage level of CAN_GND of different CAN
device in the same CAN bus system are not equal. At this time, it
could cause some problems to derogate system staibility of this
CAN bus system.
There is one way to relieve this situation; user can connect the
CAN_GND between those CAN devices to achieve equal
voltage level of CAN_GND.
Wiring of CAN_GND is not necessary; user can modify the
configuration of wiring according to actual applications.
Note 2:
Electronic circuits are constantly vulnerable to Electro-Static
Discharge (ESD), which become worse in a continental climate
area. FG(Frame Ground) provides a path for bypassing ESD to
earth ground, allowing enhanced static protection (ESD)
capability and ensures that the module is more reliable.
If user wants to use FG, both the Pin 7 and Pin 14 should be
connected to earth ground. Within I-7531 / I-7531-UT, Pin 7 and
Pin 14 (FG) are not interconneced.
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：10
2.4 Wire Connection
Figure5. Wire Connection of I-7531
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：11
2.5 Status LED
When user turning I-7531 / I-7531-UT on, the status LED of I-7531 / I-7531-UT will be display
with red light. Moreover, when a message passes through I-7531 / I-7531-UT, the status LED will
be twinkle once with yellow light while the red light is still on.
Note 3:
Twinkling rate correlates with baud rate of CAN bus. User may see
no twinkling when the twinkling period is too short because of the
higher baud rate of CAN bus. Besides, the yellow LED could look
like always on when bus loading is heavy.
2.6 Terminator Resistor Setting
According to the ISO 11898-2 specifications, the bus line of CAN_H and CAN_L must be
terminated by resistor for proper operation. The equivalent resistance between CAN_H and
CAN_L should be 60Ω. There are some examples below.
Figure6. Terminator Resistor
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：12
On the other hand, I-7531 / I-7531-UT module include two build-in 120Ωterminator resistors,
user can decide to enable those two terminator resistors or not.
The JP2 of I-7531 / I-7531-UT is used for adjusting terminal resistor on CAN Port 1, and the
JP3 of I-7531 is used for adjusting terminal resistor on CAN Port 2.
Before adjusting JP2 or JP3 of I-7531 / I-7531-UT, user needs to open the cover of I-7531 /
I-7531-UT first. Those locations of JP2 and JP3 are shown as following:
Figure7. JP2 and JP3 positions
The following connection statuses present the condition if the terminal resistor is enabled
(default) or disabled.
Figure8. Adjustment of Terminator Resistor
Disable
(Deactivate) Enable
(Activate)
JP2JP3
CON1 CON2
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：13
2.7 Cable Selection
The CAN bus is a balanced (differential) 2-wire interface running over either a Shielded Twisted
Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable.
The table below show recommended DC parameters of CAN bus line.
Table2. Recommended DC parameters for CAN Bus Line
Wire Cross-Section [mm2]
Resistance [Ω/km]
~0.25(AWG23)
< 90
~0.5 (AWG20)
< 50
~0.8 (AWG18)
< 33
~1.3 (AWG16)
< 20
The recommended AC parameters of CAN bus line are 120Ω impedance and 5 ns/m specific line
delay.
2.8 Driving Capability and Baud Rate
The relationship between ideal total bus length and baud are displayed below.
Table3. Baud, Total Bus Length, and Number of I-7531 / I-7531-UT
Baud
[bit/sec]
Ideal Bus Length without I-7531 /
I-7531-UT [m]
Max I-7531 /
I-7531-UT Number
800K
50
1
500K
100
2
250K
250
6
125K
500
12
50K
1000
25
20K
2500
62
10K
5000
125
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：14
Note 4:
When users add one I-7531 into a CAN network, the ideal total
bus length will reduce 40 meters because of the propagation delay
of I-7531. For example, if users use baud 500K and one I-7531,
the ideal total bus length will be “100 –40 * 1 = 60 meters“.
After deciding the number of I-7531 and calculating the corresponding ideal bus length, users
can use the following table to know the maximum node number in each segment and the
maximum segment length when using different type of wire.
Table4. Driving Capability
Wire Cross-
Section [mm2]
The maximum segment length [m] under the
case of specific node number in this segment
16 Nodes
32 Nodes
64 Nodes
100 Nodes
~0.25(AWG23)
<220 m
<200 m
<170 m
<150 m
~0.5 (AWG20)
<390 m
<360 m
<310 m
<270 m
~0.8 (AWG18)
<590 m
<550 m
<470 m
<410 m
~1.3 (AWG16)
<980 m
<900 m
<780 m
<670 m
Figure9. Definition of Lseg1 and Ltotal
Note 5:
The definition of segment and the relationship between segment length (Lseg1,
Lseg2 …) and ideal total bus length (Ltotal) are shown in the following figure.
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：15
3. Application Architecture
Figure10. Application Architecture
I-7531 / I-7531-UT
I-7531 / I-7531-UT
I-7531 / I-7531-UT
I-7531 / I-7531-UT
I-7531 / I-7531-UT
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：16
4. Dimension and Mounting
56.00
35.40
50.80
58.15
71.65
31.50
2-SCREW
M3
56.06
121.98
101
35
Unit : mm
Top View Bottom View
Back View Front View
35
39.50
MOUNTING
BRACKET
25.60
Side View
DIN- RAIL
Figure11. Dimension
I-7531 & I-7531-UT (CAN Bus Isolated Repeater) User Manual Version 1.6.0 Page：17
Figure12. Assembly Drawing
Figure13. Mounting
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