Dynacord H 2500 Manuel d'utilisateur télécharger pdf (Page 45)

PowerH SERIES

Owner’s Manual 45

Performance Specifications

According to the ISO 11898-2 standard, CAN-bus data transfer cabling has to be carried out using Twisted-

Pair cables with or without shielding providing a characteristic impedance of 120 Ω. Both ends of a CAN-

bus need to be terminated with 120 Ω termination-plugs. The maximum bus-length depends on the actual

data transfer rate, the kind of data transfer cable being used, as well as the total number of participants on

the bus. The following table shows the most essential requirements for CAN-networks consisting of up to

64 participants.

* With longer cables and many participants on the CAN-bus, termination resistors with higher impedance

than the specified 120 Ω are recommended to reduce the ohmic load of the interface drivers and therefore

the voltage drop between the two cable-ends.

The following table is meant for first assessment of necessary cable diameters for different bus lengths and

bus-participant numbers.

Additionally, the length of branch lines - for participants that are not directly connected to the CAN-bus - is

also of importance. For data transfer rates of up to 125 kbit/s, the maximum length of a single stub cable

should not exceed 2 meters. For higher bit rates a maximum length of only 0.3 meter is still permissible.

The entire length of all branch lines should not exceed 30 meters.

General Note:

• As long as only short distances (up to 10 meters) are concerned, common RJ-45 patch cables with a

characteristic impedance of 100 Ω (AWG 24 / AWG 26) can be used for the cabling inside of a rack

mounted system.

• The previously outlined guidelines for network cabling are mandatory as far as the rack mounted

shelve interconnection or fixed installations are involved.

Bus Length

(in m)

Data Transmission Cable

Termination (in Ω) Max. Data Transfer Rate

Resistance per Unit

Length

(in mΩ/m)

Cable Diameter

0...40 < 70

0,25...0,34 mm²

AWG23, AWG22

124

1000 kbit/s

at 40 m

40...300 < 60

0,34...0,6 mm²

AWG22, AWG20

127

500 kbit/s

at 100 m

300...600 < 40

0,5...0,6 mm²

AWG 20

150...300*

100 kbit/s

at 500 m

600...1000 < 26

0,75...0,8 mm²

AWG 18

150...300*

62,5 kbit/s

at 1000 m

Bus Length (in m)

Number of Units on the CAN-Bus

32 64 100

100 0,25 mm² / AWG24 0,34 mm² / AWG22 0,34 mm² / AWG22

250 0,34 mm² / AWG22 0,5 mm² / AWG20 0,5 mm² / AWG20

500 0,75 mm² / AWG18 0,75 mm² / AWG18 1,0 mm² / AWG17

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 147 148

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Dynacord H 2500 Manuel d'utilisateur Page 45

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