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Bộ lặp cách ly 2 cổng CAN Bus ICP DAS I-7531-G CR

CAN bus isolated repeater

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Model: I-7531-G CR
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Bộ lặp cách ly 2 cổng CAN Bus ICP DAS I-7531-G CR

The I-7531 is an isolated CAN repeater that can be used to establish a physical coupling of two segments of a CAN bus system. This module is designed to isolate the noise and disturbance between the two CAN ports of the I-7531. When the CAN signal is decayed because of the rough bus cable or noise, the I-7531 can recover the shape of the CAN signals to the original ones. Tree topologies can be implemented as well as long drop lines using the I-7531. In order to use the I-7531 easily, the module can automatically adjust the baud rate by itself to match the CAN network. Users just connect the I-7531 with the CAN buses, check the terminal resistor and power it on, subsequently the I-7531 enable to work normally. For detail information , please refer to the user manual of I-7531.


  • Control System
  • Building Automation
  • Factory Automation
  • Distributed data acquisition

Kiến trúc ứng dụng

The relationship between ideal total bus length and baud are displayed below.

Baud [bit/sec] Ideal Bus Length without I-7531 [m]
800K 50
500K 100
250K 250
125K 500
50K 1000
20K 2500
10K 5000

Note:When users apply one I-7531/I-7531-UT into a CAN network, the ideal CAN communication distance will be reduced 40 meters. For example, if the CAN network is under 500K bps baud rate and one I-7531/I-7531-UT is applied in the network, the ideal total bus length becomes 100-40*1=60 meters. If using two I-7531/I-7531-UTs in this network, the communication distance is 100-40*2=20 meters.

After deciding the number of I-7531/I-7531-UT 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.

Wire Cross-
Section [mm2]
The maximum segment length [m] under the case of
specific node number in this segment
32 Nodes 64 Nodes 100 Nodes
~0.25 (AWG23) <200 m <170 m <150 m
~0.5 (AWG20) <360 m <310 m <270 m
~0.8 (AWG18) <550 m <470 m <410 m
~1.3 (AWG16) <900 m <780 m <670 m

Note: The definition of segment and the relationship between segment length (Lseg1, Lseg2 …) and ideal total bus length (Ltotal) are shown in the following figure.

Propagation Delay 200 ns
Ports 2
Baud Rate 5 k ~ 800 k bps
Isolation 3000 VDC for DC-to-DC, 2500 Vrms for photo-couple
Terminal Resistor Jumper for 120 Ω terminal resistor
Specification ISO-11898-2, CAN 2.0A and CAN 2.0B
Time Delay 200ns
Input Range +10 VDC ~ +30 VDC
Consumption 2 W
Casing Plastic
Dimensions (mm) 72 x 118 x 33 (W x L x H)
Installation DIN-Rail
Operating Temperature -25 ~ +75 °C
Storage Temperature -30 ~ +80 °C
Humidity 10 ~ 90% RH, Non-condensing
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