ICP DAS - I-7531

CAN Bus

I-7531

Applications

Application Architecture

Driving Capability and Baud Rate

CAN Bus

I-7000 Series

I-7531 ~ NEW ~
CAN bus isolated repeater

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 for long drop lines with I-7531. Connecting via I-7531, the division of a CAN system into several subsystems increases the maximum number of bus nodes.

The I-7531 is an optically isolated CAN repeater which provides 2500Vrms of 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. 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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Applications

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

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Application Architecture

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Driving Capability and Baud Rate

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

Baud [bit/sec]	Ideal Bus Length without I-7531 [m]	Max I-7531 Number
800K	50	1
500K	100	2
250K	250	6
125K	500	12
50K	1000	25
20K	2500	62
10K	5000	125


Note:	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.

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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Specifications

Support CAN 2.0A/CAN 2.0B
Fully compatible with the ISO 11898-2 standard
Maximum communication baud : 800Kbps
Propagation delay: ~200ns (200ns delay shortens bus line length by ~40m)
Driving capability : Up to 100 nodes on each CAN port
Photo-coupler isolation between 2 CAN port: 2500Vrms
Power consumption: 2W max
Mountable on DIN Rail
Removable terminal block.
CAN termination resistors are integrated (can be disabled)
3KV galvanic isolation among the power supply and 2 CAN ports
Power Supply: +10VDC ~ +30VDC
Operating temperature: -25°C to +75°C
Humidity: 5%~ 95%
Dimensions: 122 mm x 72 mm x 33 mm

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Ordering Information

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

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