ICP DAS - I-7531

CAN Bus

I-7531

Applications

Features

Application Architecture

Driving Capability and Baud Rate

CAN Bus

I-7000 Series

I-7531
CAN bus isolated repeater

The I-7531 is a CAN repeater used to establish a physical coupling of two or more segments of a CAN bus system. Users can implement tree or star topologies as well as the long drop lines with the I-7531. Users can also increase the maximum number of bus nodes by using the I-7531.

The I-7531 is an optically isolated CAN repeater which provides 2500Vrms of optical isolation. This feature helps you to separate and protect critical segments of the system from the rest of the CAN network. And its galvanic protection isolates among two both CAN segments and the power supply.

The CAN connection of I-7531 is by terminal blocks. A power supply of 10VDC ~ 30VDC is required. I-7531 is housed in a rugged DIN-Rail mountable box, making it easy to install in an industrial cabinet. Futhermore, I-7531 can be used in CANopen, DeviceNet and generic ISO 11898-2 standard.

For detail information , please refer to the user manual of I-7531.

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

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Compatible with CAN specification 2.0A and 2.0B
Fully compatible with the ISO 11898-2 standard
Maximum communication baud : 800Kbps
2500 VRMS photo coupler isolation on the CAN side
3KV galvanic isolation among the power supply and 2 CAN ports
Jumper for 120Ω terminator resistor of the CAN bus
Two CAN channels
Auto-baud detection
up to 100 nodes on each CAN port
Removable terminal block
Mount easily on DIN-rail

Note: We have verified to drive 100 CAN nodes at the same time via one CAN port of I-7531.

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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 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 is applied in the network, the ideal total bus length becomes 100-401=60 meters. If using two I-7531s in this network, the communication distance is 100-402=20 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.

Wire Cross- Section [mm2]	The maximum segment length [m] under the case of specific node number in this segment
Wire Cross- Section [mm2]	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.

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CAN Interface
Transceiver	NXP 82C250
Channel number	2
Connector	3-pin screwed terminal block (CAN_GND, CAN_L, CAN_H)
Baud Rate (bps)	5 k ~ 800 k
Isolation	3000 VDC for DC-to-DC, 2500 Vrms for photo-couple
Terminator Resistor	Jumper for 120 Ω terminator resistor
Specification	ISO-11898-2, CAN 2.0A and CAN 2.0B
Power
Power supply	Unregulated +10 ~ +30 VDC
Protection	Power reverse polarity protection, Over-voltage brown-out protection
Power Consumption	2 W
Mechanism
Installation	DIN-Rail
Dimensions	72mm x 118mm x 33mm (W x L x H)
Environment
Operating Temp.	-25 ~ 75 ℃
Storage Temp.	-30 ~ 80 ℃
Humidity	10 ~ 90% RH, non-condensing

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I-7531-G	CAN bus isolated repeater
I-7531-G CR	CAN bus isolated repeater (RoHS)

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CA-0910-C	9-pin Female D-sub & 3-wire CAN bus cable (1M)
SG-770	7/14 channel Surge Protector
4PCD-002	EMI Ferrite Split/Snap-On Core
M12A-5P-IP68	Field-Installation A-coded 5-pin Female

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